[10-Q] OLIN Corp Quarterly Earnings Report

Rhea-AI Filing Summary

Olin Corporation (OLN) reported a return to profitability in Q3 2025. Sales were $1,713.2 million, up from $1,589.5 million, and net income attributable to Olin was $42.8 million (diluted EPS $0.37) versus a loss of $24.9 million (EPS $(0.21)) a year ago. Operating income rose to $82.8 million from $15.5 million as Chlor Alkali improved and Winchester remained solid, while Epoxy stayed weak.

For the nine months, sales were $5,115.7 million versus $4,868.8 million, with net income of $42.9 million (EPS $0.37) versus $97.9 million (EPS $0.81). Results benefited from a $32.0 million reduction to cost of goods sold tied to the Section 45V clean hydrogen production tax credit. Olin closed the $55.8 million acquisition of AMMO, Inc.’s Manitowoc, WI small caliber assets into Winchester.

Cash and equivalents were $140.3 million; total debt was $2,993.4 million. Olin issued $600.0 million 6.625% notes due 2033 and upsized its senior credit facility to $1,850.0 million, using proceeds to redeem 2025/2027 notes and refinance prior facilities. YTD operating cash flow was $153.0 million; 1.7 million shares were repurchased for $40.4 million. Shares outstanding were 114,121,529 as of September 30, 2025.

Insights

Credit & equity analyst

Q3 profit rebound aided by tax credits; maturities extended.

Olin posted Q3 sales of $1,713.2M and net income of $42.8M, reversing last year’s loss. The filing attributes a $32.0M reduction to cost of goods sold to the Section 45V clean hydrogen credit, which lifted gross margin. Segment detail shows Chlor Alkali stronger, Winchester steady, and Epoxy still loss-making.

On capital structure, Olin issued $600.0M 6.625% notes due 2033 and entered a $1,850.0M senior credit facility maturing 2030, using proceeds to redeem $108.6M (2025) and $500.0M (2027) notes and refinance prior facilities. Q3 interest expense was $46.8M. Availability under the revolver was $1,169.6M at quarter-end.

YTD operating cash flow was $153.0M, capex $163.5M, and share repurchases $40.4M (1.7M shares). Restructuring charges were $14.3M YTD; the remaining restructuring accrual was $8.6M. The company states it expects to continue to qualify for Section 45V through 2032; actual margin effects depend on volumes and credit realization.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2025

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission file number 1-1070

Olin Corporation

(Exact name of registrant as specified in its charter)

Virginia			13-1872319
(State or other jurisdiction of incorporation or organization)			(I.R.S. Employer Identification No.)

190 Carondelet Plaza,

Suite 1530,

Clayton,

MO

63105

(Address of principal executive offices)

(Zip Code)

(314) 480-1400

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class:

Trading symbol:

Name of each exchange on which registered:

Common Stock, $1.00 par value per share

OLN

New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☐ No ☒

As of September 30, 2025, 114,121,529 shares of the registrant’s common stock were outstanding.

1

TABLE OF CONTENTS FOR FORM 10-Q						Page
Part I — Financial Information						3
Item 1.			Financial Statements			3
			Condensed Balance Sheets			3
			Condensed Statements of Operations			4
			Condensed Statements of Comprehensive Income			5
			Condensed Statements of Shareholders’ Equity			6
			Condensed Statements of Cash Flows			7
			Notes to Condensed Financial Statements			8
Item 2.			Management’s Discussion and Analysis of Financial Condition and Results of Operations			26
			Business Background			26
			Executive Summary			27
			Consolidated Results of Operations			28
			Segment Results			30
			Outlook			33
			Environmental Matters			33
			Legal Matters and Contingencies			34
			Liquidity and Capital Resources			35
Item 3.			Quantitative and Qualitative Disclosures about Market Risk			38
Item 4.			Controls and Procedures			39
			Cautionary Statement Regarding Forward-Looking Statements			39
Part II — Other Information						41
Item 1.			Legal Proceedings			41
Item 1A.			Risk Factors			41
Item 2.			Unregistered Sales of Equity Securities and Use of Proceeds			41
Item 3.			Defaults Upon Senior Securities			41
Item 4.			Mine Safety Disclosures			41
Item 5.			Other Information			41
Item 6.			Exhibits			42
SIGNATURES						43

2

Table of Contents

PART I — FINANCIAL INFORMATION

ITEM 1.  FINANCIAL STATEMENTS

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Balance Sheets

($ in millions, except per share data)

(Unaudited)

			September 30, 2025						December 31, 2024						September 30, 2024
Assets
Current assets:
Cash and cash equivalents			$	140.3					$	175.6					$	225.9
Receivables, net			1,000.2						1,007.8						863.2
Income taxes receivable			77.7						11.5						18.9
Inventories, net			966.9						823.5						827.7
Other current assets			79.7						61.4						66.0
Total current assets			2,264.8						2,079.8						2,001.7
Property, plant and equipment (less accumulated depreciation of $5,487.7, $5,189.2 and $5,120.4)			2,205.1						2,328.4						2,343.4
Operating lease assets, net			298.3						302.2						309.3
Deferred income taxes			53.0						53.4						90.4
Other assets			1,170.4						1,185.1						1,131.5
Intangible assets, net			183.4						206.6						218.3
Goodwill			1,425.9						1,423.6						1,423.7
Total assets			$	7,600.9					$	7,579.1					$	7,518.3
Liabilities and Shareholders’ Equity
Current liabilities:
Current installments of long-term debt			$	19.2					$	129.0					$	123.9
Accounts payable			845.7						861.6						759.1
Income taxes payable			18.9						141.3						138.4
Current operating lease liabilities			60.6						64.8						65.4
Accrued liabilities			507.9						435.5						343.1
Total current liabilities			1,452.3						1,632.2						1,429.9
Long-term debt			2,974.2						2,713.2						2,765.6
Operating lease liabilities			250.2						243.2						250.0
Accrued pension liability			228.5						197.7						202.6
Deferred income taxes			369.8						430.5						445.9
Other liabilities			332.2						306.9						334.7
Total liabilities			5,607.2						5,523.7						5,428.7
Commitments and contingencies
Shareholders’ equity:
Common stock, $1.00 par value per share: authorized, 240.0 shares; issued and outstanding, 114.1 , 115.7 and 116.6 shares			114.1						115.7						116.6
Accumulated other comprehensive loss			(462.2)						(450.1)						(466.2)
Retained earnings			2,310.3						2,357.5						2,406.3
Olin Corporation’s shareholders’ equity			1,962.2						2,023.1						2,056.7
Noncontrolling interests			31.5						32.3						32.9
Total equity			1,993.7						2,055.4						2,089.6
Total liabilities and equity			$	7,600.9					$	7,579.1					$	7,518.3

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

3

Table of Contents

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Operations

($ in millions, except per share data)

(Unaudited)

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Sales			$	1,713.2					$	1,589.5					$	5,115.7					$	4,868.8
Operating expenses:
Cost of goods sold			1,529.8						1,455.0						4,645.5						4,289.2
Selling and administrative			98.1						111.7						294.3						308.2
Restructuring charges			2.9						7.9						14.3						23.0
Other operating income			0.4						0.6						0.2						0.8
Operating income			82.8						15.5						161.8						249.2
Losses of non-consolidated affiliates			(1.0)						—						(2.4)						—
Interest expense			(46.8)						(48.4)						(142.1)						(139.6)
Interest income			1.6						1.0						4.0						2.7
Non-operating pension income			4.9						6.7						15.5						19.4
Income (loss) before taxes			41.5						(25.2)						36.8						131.7
Income tax (benefit) provision			(2.2)						—						(5.3)						36.8
Net income (loss)			43.7						(25.2)						42.1						94.9
Net income (loss) attributable to noncontrolling interests			0.9						(0.3)						(0.8)						(3.0)
Net income (loss) attributable to Olin Corporation			$	42.8					$	(24.9)					$	42.9					$	97.9
Net income (loss) attributable to Olin Corporation per common share:
Basic			$	0.37					$	(0.21)					$	0.37					$	0.83
Diluted			$	0.37					$	(0.21)					$	0.37					$	0.81
Weighted-average common shares outstanding:
Basic			114.4						116.9						114.9						118.4
Diluted			115.1						116.9						115.6						120.2

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

4

Table of Contents

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Comprehensive Income

($ in millions)

(Unaudited)

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Net income (loss)			$	43.7					$	(25.2)					$	42.1					$	94.9
Other comprehensive (loss) income, net of tax:
Foreign currency translation			(9.6)						2.3						(13.0)						(2.5)
Cash flow hedges			(2.2)						4.7						(2.2)						29.2
Pension and postretirement benefits			1.0						0.8						3.1						3.4
Total other comprehensive (loss) income, net of tax			(10.8)						7.8						(12.1)						30.1
Comprehensive income (loss)			32.9						(17.4)						30.0						125.0
Comprehensive income (loss) attributable to noncontrolling interests			0.9						(0.3)						(0.8)						(3.0)
Comprehensive income (loss) attributable to Olin Corporation			$	32.0					$	(17.1)					$	30.8					$	128.0

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

5

Table of Contents

OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Shareholders’ Equity

($ in millions, except per share data)

(Unaudited)

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Common Stock
Balance at beginning of period			$	114.6					$	117.5					$	115.7					$	120.2
Common stock repurchased and retired			(0.5)						(1.0)						(1.7)						(4.9)
Common stock issued for:
Stock options exercised			—						0.1						—						0.9
Other transactions			—						—						0.1						0.4
Balance at end of period			114.1						116.6						114.1						116.6
Additional Paid-In Capital
Balance at beginning of period			—						—						—						24.8
Common stock repurchased and retired			(5.9)						(6.3)						(17.4)						(47.5)
Common stock issued for:
Stock options exercised			0.2						0.8						2.1						21.7
Other transactions			—						0.2						4.4						(4.0)
Stock-based compensation			5.7						5.3						10.9						5.0
Balance at end of period			—						—						—						—
Accumulated Other Comprehensive Loss
Balance at beginning of period			(451.4)						(474.0)						(450.1)						(496.3)
Other comprehensive (loss) income, net of tax			(10.8)						7.8						(12.1)						30.1
Balance at end of period			(462.2)						(466.2)						(462.2)						(466.2)
Retained Earnings
Balance at beginning of period			2,294.0						2,492.6						2,357.5						2,583.7
Net income (loss) attributable to Olin Corporation			42.8						(24.9)						42.9						97.9
Common stock dividends paid			(22.8)						(23.3)						(68.8)						(70.9)
Common stock repurchased and retired			(3.7)						(38.1)						(21.3)						(204.4)
Balance at end of period			2,310.3						2,406.3						2,310.3						2,406.3
Olin Corporation’s Shareholders’ Equity			1,962.2						2,056.7						1,962.2						2,056.7
Noncontrolling Interests
Balance at beginning of period			30.6						33.2						32.3						35.9
Net income (loss) attributable to noncontrolling interest			0.9						(0.3)						(0.8)						(3.0)
Balance at end of period			31.5						32.9						31.5						32.9
Total Equity			$	1,993.7					$	2,089.6					$	1,993.7					$	2,089.6
Dividends declared per share of common stock			$	0.20					$	0.20					$	0.60					$	0.60

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

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OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Condensed Statements of Cash Flows

($ in millions)

(Unaudited)

			Nine Months Ended September 30,
			2025						2024
Operating Activities
Net income			$	42.1					$	94.9
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Depreciation and amortization			395.9						388.9
Losses of non-consolidated affiliates			2.4						—
Stock-based compensation			15.6						11.8
Deferred income taxes			(54.1)						(43.7)
Qualified pension plan contributions			(0.6)						(0.9)
Qualified pension plan income			(13.5)						(17.5)
Change in assets and liabilities:
Receivables			(33.1)						5.1
Income taxes receivable/payable			(196.0)						(21.5)
Inventories			(100.1)						32.8
Other current assets			(7.4)						2.1
Accounts payable and accrued liabilities			71.7						(77.2)
Other assets			6.6						(24.9)
Other noncurrent liabilities			25.2						6.2
Other operating activities			(1.7)						5.4
Net operating activities			153.0						361.5
Investing Activities
Capital expenditures			(163.5)						(144.1)
Business acquired in purchase transaction, net of cash acquired			(55.8)						—
Payments under other long-term supply contracts			—						(58.6)
Investments in non-consolidated affiliates			(1.6)						—
Other investing activities			(4.7)						(4.3)
Net investing activities			(225.6)						(207.0)
Financing Activities
Long-term debt:
Borrowings			2,485.0						587.4
Repayments			(2,329.2)						(370.7)
Common stock repurchased and retired			(40.4)						(256.8)
Stock options exercised			2.1						22.6
Employee taxes paid for share-based payment arrangements			—						(10.5)
Dividends paid			(68.8)						(70.9)
Debt issuance costs			(12.0)						—
Net financing activities			36.7						(98.9)
Effect of exchange rate changes on cash and cash equivalents			0.6						—
Net (decrease) increase in cash and cash equivalents			(35.3)						55.6
Cash and cash equivalents, beginning of year			175.6						170.3
Cash and cash equivalents, end of period			$	140.3					$	225.9
Cash paid for interest and income taxes:
Interest, net			$	137.1					$	156.5
Income taxes, net of refunds			168.3						95.6
Non-cash investing activities:
Decrease in capital expenditures included in accounts payable and accrued liabilities			29.3						20.5

The accompanying notes to condensed financial statements are an integral part of the condensed financial statements.

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OLIN CORPORATION AND CONSOLIDATED SUBSIDIARIES

Notes to Condensed Financial Statements

(Unaudited)

NOTE 1. DESCRIPTION OF BUSINESS

Olin Corporation (Olin, the Company, we or our) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. We are a leading vertically integrated global manufacturer and distributor of chemical products and a leading U.S. manufacturer of ammunition. Our operations are concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. All of our business segments are capital-intensive manufacturing businesses. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride and vinyl chloride monomer, methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials and precursors, including aromatics (acetone and phenol), allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and formulated solutions products such as converted epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, industrial cartridges and clay targets.

Basis of Presentation

We have prepared the condensed financial statements included herein, without audit, pursuant to the rules and regulations of the United States (U.S.) Securities and Exchange Commission (SEC). The preparation of the financial statements requires estimates and assumptions that affect amounts reported and disclosed in the financial statements and related notes. In our opinion, these financial statements reflect all adjustments (consisting only of normal accruals), which are necessary to present fairly the results for interim periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted pursuant to such rules and regulations; however, we believe that the disclosures are appropriate. We recommend that you read these condensed financial statements in conjunction with the financial statements, accounting policies and the notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2024.

NOTE 2. RECENT ACCOUNTING PRONOUNCEMENTS

In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which expands the disclosure requirements in the notes to the financial statements on certain costs and expenses on an interim and annual basis. The new requirements are effective for the Company’s annual reporting periods beginning after December 15, 2026 and interim periods beginning after December 15, 2027, with the option to early adopt at any time before the effective date. ASU 2024-03 requires adoption on a prospective basis, with the option for retrospective application. While the ASU implements further disclosure requirements, it does not change how an entity calculates and/or records its expenses, and it will have no impact on the Company’s consolidated financial statements. We are currently evaluating the impact of the standard on our disclosures.

In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which includes amendments that further enhance income tax disclosures, primarily through standardization and disaggregation of rate reconciliation categories and income taxes paid by jurisdiction. The amendments are effective for annual periods beginning after December 15, 2024, with the option to early adopt at any time before the effective date. ASU 2023-09 allows for adoption on a prospective or retrospective basis. We will adopt this standard beginning with our fiscal year ending December 31, 2025. We are currently evaluating the impact of the standard on our consolidated financial statements and disclosures.

NOTE 3. ACQUISITIONS

On April 18, 2025, Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for total consideration of $55.8 million, subject to normal post-closing adjustments. The acquisition, which includes AMMO Inc.’s brass shellcase capabilities and its 185,000 square foot production facility located in Manitowoc, WI, is included in Olin’s Winchester segment. The acquisition was financed with cash on hand. We recorded the preliminary aggregate excess purchase price over the fair value of identifiable tangible assets acquired and liabilities assumed, which included a preliminary allocation of $2.4 million of goodwill to our Winchester segment. The preliminary total assets acquired, excluding goodwill, and liabilities assumed amounted to $59.5 million and $6.1 million respectively. The acquisition is not material and therefore supplemental pro forma financial information is not provided.

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NOTE 4. RESTRUCTURING CHARGES

Prior restructuring and optimization efforts, which have been previously announced and which we continue to execute on, include:

•closure of Chlorine 3 manufacturing facility in Freeport, TX announced on December 11, 2024;

•reduction of epoxy resin capacity at Freeport, TX facility, ceasing of remaining operations at Gumi, South Korea facility and reduction of sales and support staffing across Asia all announced on June 20, 2023;

•closure of cumene facility in Terneuzen, Netherlands and ceasing of solid epoxy resin production at Gumi, South Korea and Guaruja, Brazil announced on March 21, 2023;

•closure of one of our bisphenol production lines at Stade, Germany site announced in 2022;

•closure of diaphragm-grade chlor alkali capacity of 400,000 tons at McIntosh, AL facility announced in 2021;

•closure of trichloroethylene and anhydrous hydrogen chloride liquefaction facilities in Freeport, TX announced January 18, 2021; and

•closure of chlor alkali plant with capacity of 230,000 tons and vinylidene chlorine production facility, both in Freeport, TX announced on December 11, 2019.

Pretax restructuring charges related to these actions include facility exit costs, lease and other contract termination costs, employee severance and related benefits costs and the write-off of equipment and facilities. The following table summarizes the 2025 and 2024 restructuring activity by component and the remaining balances in accrued restructuring costs as of September 30, 2025 and 2024:

			Employee Severance and Related Benefit Costs						Lease and Other Contract Termination Costs						Facility Exit Costs												Total
Changes in Reserve			($ in millions)
Balance at January 1, 2024			$	10.8					$	16.7					$	—											$	27.5
Restructuring charges:
First quarter			—						—						8.3												8.3
Second quarter			—						1.7						5.1												6.8
Third quarter			—						2.9						5.0												7.9
Amounts utilized			(8.4)						(9.9)						(18.4)												(36.7)
Balance at September 30, 2024			$	2.4					$	11.4					$	—											$	13.8
Balance at January 1, 2025			$	3.1					$	5.2					$	—											$	8.3
Restructuring charges:
First quarter			1.6						0.2						2.2												4.0
Second quarter			3.8						—						3.6												7.4
Third quarter			0.6						—						2.3												2.9
Amounts utilized			(4.2)						(1.7)						(8.1)												(14.0)
Balance at September 30, 2025			$	4.9					$	3.7					$	—											$	8.6

The following table summarizes the cumulative restructuring charges for each segment related to the restructuring and optimization efforts summarized above, by component, through September 30, 2025:

			Chlor Alkali Products and Vinyls						Epoxy						Total
Cumulative Restructuring Charges			($ in millions)
Write-off of equipment and facility			$	61.6					$	18.3					$	79.9
Employee severance and related benefit costs			2.1						21.6						23.7
Facility exit costs			58.8						37.6						96.4
Lease and other contract termination costs			6.4						34.3						40.7
Total cumulative restructuring charges			$	128.9					$	111.8					$	240.7

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As of September 30, 2025, we have incurred cumulative restructuring-related cash expenditures of $152.2 million and non-cash charges of $79.9 million related to our restructuring actions. The remaining accrued restructuring liability of $8.6 million is expected to be paid out through 2027. We expect to incur additional restructuring charges through 2030 of approximately $75.0 million related to these actions.

NOTE 5. EARNINGS PER SHARE

Basic and diluted net income (loss) attributable to Olin Corporation per share are computed by dividing net income (loss) attributable to Olin Corporation by the weighted-average number of common shares outstanding. Diluted net income (loss) attributable to Olin Corporation per share reflects the dilutive effect of stock-based compensation.

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Computation of Earnings per Share			(In millions, except per share data)
Net income (loss) attributable to Olin Corporation			$	42.8					$	(24.9)					$	42.9					$	97.9
Weighted-average common shares - basic			114.4						116.9						114.9						118.4
Dilutive effect of stock-based compensation			0.7						—						0.7						1.8
Weighted-average common shares - diluted			115.1						116.9						115.6						120.2
Earnings (loss) per common share attributable to Olin Corporation:
Basic			$	0.37					$	(0.21)					$	0.37					$	0.83
Diluted			$	0.37					$	(0.21)					$	0.37					$	0.81

The computation of dilutive shares does not include 3.8 million and 3.3 million shares for the three months ended September 30, 2025 and 2024, respectively, and 3.8 million and 1.9 million shares for the nine months ended September 30, 2025 and 2024, respectively, as their effect would have been anti-dilutive.

NOTE 6. ACCOUNTS RECEIVABLE

Our condensed balance sheets includes the following amounts within receivables, net:

			September 30, 2025						December 31, 2024						September 30, 2024
Accounts Receivable			($ in millions)
Allowance for doubtful accounts receivable			$	12.3					$	11.8					$	12.2
Other receivables(1)			92.8						94.6						94.5

(1)    Other receivables primarily relates to indirect taxes in foreign jurisdictions.

NOTE 7. INVENTORIES

Inventories consisted of the following:

			September 30, 2025						December 31, 2024						September 30, 2024
Inventories			($ in millions)
Supplies			$	155.5					$	149.3					$	147.6
Raw materials			200.9						185.2						189.0
Work in process			219.7						173.1						159.9
Finished goods			541.5						467.3						499.1
Inventories excluding LIFO reserve			1,117.6						974.9						995.6
LIFO reserve			(150.7)						(151.4)						(167.9)
Inventories, net			$	966.9					$	823.5					$	827.7

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Inventories under the LIFO method are based on annual estimates of quantities and costs as of year-end; therefore, the condensed financial statements at September 30, 2025, reflect certain estimates relating to inventory quantities and costs at December 31, 2025. The replacement cost of our inventories would have been approximately $150.7 million, $151.4 million and $167.9 million higher than reported at September 30, 2025, December 31, 2024 and September 30, 2024, respectively.

NOTE 8. OTHER ASSETS

Included in other assets were the following:

			September 30, 2025						December 31, 2024						September 30, 2024
Other Assets			($ in millions)
Supply contracts			$	986.4					$	1,047.3					$	1,067.2
Pension assets			69.1						43.3						1.7
Investments in non-consolidated affiliates			21.8						23.0						—
Other			93.1						71.5						62.6
Other assets			$	1,170.4					$	1,185.1					$	1,131.5

For the nine months ended September 30, 2024, payments of $58.6 million were made under other long-term supply contracts for energy modernization projects in the U.S. Gulf Coast.

Amortization expense of $20.9 million and $18.3 million for the three months ended September 30, 2025 and 2024, respectively, and amortization expense of $62.7 million and $54.9 million for the nine months ended September 30, 2025 and 2024, respectively, was recognized within cost of goods sold related to our long-term supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows.

Investments in Non-consolidated Affiliates

Olin Corporation and Plug Power, Inc. have a joint venture named Hidrogenii, LLC (Hidrogenii), a strategic partnership that aims to leverage the strengths of both companies to advance hydrogen production and utilization. The joint venture began with the construction of a 15-ton-per-day hydrogen liquefaction plant in St. Gabriel, LA, which commenced operations in the second quarter 2025. Hidrogenii is owned 50% by Plug Power LA JV, LLC, a wholly owned subsidiary of Plug Power, Inc., and 50% by Niloco Hydrogen Holdings LLC, a wholly owned subsidiary of Olin Corporation. The investments in, and the operating results of, 50%-or-less-owned entities not controlled by Olin are included in the condensed financial statements using the equity method basis of accounting and classified as non-consolidated affiliates.

The following table summarizes our investments in non-consolidated affiliates:

			Nine Months Ended September 30, 2025
Investments in Non-consolidated Affiliates			($ in millions)
Balance at beginning of year			$	23.0
Capital contributions			1.6
Losses of non-consolidated affiliates			(2.4)
Other(1)			0.4
Balance at end of period			$	21.8

(1)Represents the impact of Olin’s portion of the investment tax credit of $22.0 million, which is the basis difference between our equity ownership of Hidrogenii and Olin’s investment, and will be recognized over the useful life of the underlying operational assets.

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NOTE 9. GOODWILL AND INTANGIBLE ASSETS

Changes in the carrying value of goodwill were as follows:

			Chlor Alkali Products and Vinyls						Epoxy						Winchester						Total
Goodwill			($ in millions)
Balance at January 1, 2024(1)			$	1,276.1					$	145.2					$	2.7					$	1,424.0
Acquisition activity			—						—						(0.3)						(0.3)
Balance at September 30, 2024(1)			$	1,276.1					$	145.2					$	2.4					$	1,423.7
Balance at January 1, 2025(1)			$	1,276.4					$	144.8					$	2.4					$	1,423.6
Acquisition activity			—						—						2.4						2.4
Foreign currency translation adjustment			(0.1)						—						—						(0.1)
Balance at September 30, 2025(1)			$	1,276.3					$	144.8					$	4.8					$	1,425.9

(1)Includes cumulative goodwill impairment of $557.6 million and $142.2 million in Chlor Alkali Products and Vinyls and Epoxy, respectively.

Intangible assets consisted of the following:

			September 30, 2025																		December 31, 2024																		September 30, 2024
			Gross Amount						Accumulated Amortization						Net						Gross Amount						Accumulated Amortization						Net						Gross Amount						Accumulated Amortization						Net
Intangible Assets			($ in millions)
Customers, customer contracts and relationships			$	677.2					$	(502.3)					$	174.9					$	666.7					$	(469.2)					$	197.5					$	672.9					$	(464.3)					$	208.6
Trade names			3.7						(1.1)						2.6						3.5						(0.6)						2.9						3.5						(0.5)						3.0
Acquired technology			96.6						(94.5)						2.1						93.7						(91.7)						2.0						94.7						(92.2)						2.5
Other			4.5						(0.7)						3.8						4.9						(0.7)						4.2						4.9						(0.7)						4.2
Total intangible assets			$	782.0					$	(598.6)					$	183.4					$	768.8					$	(562.2)					$	206.6					$	776.0					$	(557.7)					$	218.3

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NOTE 10. DEBT

Long-term loans, notes and other financing obligations, consisted of the following:

			September 30, 2025						December 31, 2024						September 30, 2024
Financing Obligations			($ in millions)
Fixed-rate Financing
9.50% senior notes, due 2025 (2025 Notes)			$	—					$	108.6					$	108.6
5.125% senior notes, due 2027 (2027 Notes)			—						500.0						500.0
5.625% senior notes, due 2029			669.3						669.3						669.3
5.00% senior notes, due 2030			515.3						515.3						515.3
6.625% senior notes, due 2033 (2033 Notes)			600.0						—						—
Variable-rate Financing
Term Loan Facilities			641.9						332.5						334.7
Revolving Credit Facilities			30.0						170.0						350.0
Receivables Financing Agreements			470.0						475.0						339.8
Recovery zone bonds			83.0						83.0						83.0
Industrial development and environmental improvement obligations			2.9						2.9						2.9
Other
Deferred debt issuance costs			(19.0)						(14.3)						(14.0)
Unamortized bond original issue discount			—						(0.1)						(0.1)
Total debt			2,993.4						2,842.2						2,889.5
Amounts due within one year			19.2						129.0						123.9
Total long-term debt			$	2,974.2					$	2,713.2					$	2,765.6

Senior Notes and Senior Credit Facilities

On March 14, 2025, Olin issued $600.0 million aggregate principal amount of 6.625% senior notes due April 1, 2033 (2033 Notes), in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended. Interest on the 2033 Notes began accruing from March 14, 2025 and is paid semi-annually beginning on October 1, 2025, and every six months thereafter.

On March 14, 2025, Olin entered into a $1,850.0 million senior credit facility (2025 Senior Credit Facility), which increased the borrowing limit of our then-existing $1,550.0 million senior credit facility (2022 Senior Credit Facility) by $300.0 million and extended the maturity date from October 11, 2027 to March 14, 2030. The 2025 Senior Credit Facility includes a term loan facility with aggregate commitments of $650.0 million (2025 Term Loan Facility) and a revolving credit facility with aggregate commitments of $1,200.0 million (2025 Revolving Credit Facility).

The 2025 Term Loan Facility replaced Olin’s then-existing $350.0 million term loan facility (2022 Term Loan Facility, and collectively with the new 2025 Term Loan Facility, the Term Loan Facilities). The 2025 Term Loan Facility requires principal amortization payments beginning on June 30, 2025 at a rate of 0.625% per quarter through March 31, 2027, increasing to 1.250% per quarter thereafter, until maturity, and was fully drawn on the closing date.

The 2025 Revolving Credit Facility replaced Olin’s then-existing $1,200.0 million revolving credit facility (2022 Revolving Credit Facility, and collectively with the new 2025 Revolving Credit Facility, the Revolving Credit Facilities). The 2025 Revolving Credit Facility includes a $100.0 million letter of credit subfacility. At September 30, 2025, we had $1,169.6 million available under our 2025 Revolving Credit Facility because we had $30.0 million borrowed under the facility and issued $0.4 million of letters of credit.

Proceeds from the 2033 Notes, together with borrowings under the 2025 Senior Credit Facility, were used to redeem the $108.6 million 2025 Notes, redeem the $500.0 million 2027 Notes, refinance the then-existing 2022 Senior Credit Facility, comprised of $505.0 million of borrowings under the 2022 Revolving Credit Facility and $332.5 million of borrowings under the 2022 Term Loan Facility, and pay related fees and expenses.

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We were in compliance with all covenants and restrictions under all our outstanding debt agreements as of September 30, 2025, and no event of default had occurred under any of our outstanding debt agreements that would permit the acceleration of the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As a result of our restrictive covenant related to the net leverage ratio, the maximum additional borrowings available to us could be limited in the future. The limitation, if an amendment or waiver from our lenders is not obtained, could restrict our ability to borrow the maximum amounts available under the 2025 Senior Credit Facility and the 2024 Receivables Financing Agreement (defined below). As of September 30, 2025, there were no covenants or other restrictions that limited our ability to borrow.

Receivables Financing Agreements

On November 20, 2024, we entered into a $500.0 million receivables financing agreement (2024 Receivables Financing Agreement), which increased the borrowing limit of our then-existing $425.0 million receivables financing agreement (2022 Receivables Financing Agreement) by $75.0 million and extended the maturity date from October 14, 2025 to November 19, 2027 (collectively, the Receivables Financing Agreements).

Under the Receivables Financing Agreements, our eligible trade receivables are used for collateralized borrowings and continue to be serviced by us. In addition, the Receivables Financing Agreements incorporate the net leverage ratio covenant that is contained in the 2025 Senior Credit Facility. As of September 30, 2025, December 31, 2024 and September 30, 2024, we had $470.0 million, $475.0 million and $339.8 million, respectively, drawn under the Receivables Financing Agreements. As of September 30, 2025, $617.0 million of our trade receivables were pledged as collateral and we had $28.0 million of additional borrowing capacity under the 2024 Receivables Financing Agreement, which was limited by our borrowing base.

As part of the 2024 Receivables Financing Agreement, we terminated our then-existing trade accounts receivable factoring arrangements (AR Facilities), under which certain of our domestic and international subsidiaries could sell their accounts receivable. These receivables had qualified for sales treatment under ASC 860 “Transfers and Servicing” and, accordingly, the proceeds were included in net cash provided by operating activities in the consolidated statements of cash flows.

Financing Cash Flows

During the nine months ended September 30, 2025 and 2024, activity of our outstanding debt included:

						Nine Months Ended September 30,
						2025						2024
Long-term Debt Borrowings (Repayments)						($ in millions)
Borrowings
Term Loan Facilities						$	650.0					$	—
Revolving Credit Facilities						610.0						490.0
Receivables Financing Agreements						625.0						97.4
2033 Notes						600.0						—
Total borrowings						2,485.0						587.4
Repayments
Go zone bonds, due 2024						—						(50.0)
Recovery zone bonds, due 2024						—						(20.0)
Term Loan Facilities						(340.6)						(6.6)
Revolving Credit Facilities						(750.0)						(208.0)
Receivables Financing Agreements						(630.0)						(86.1)
2025 Notes						(108.6)						—
2027 Notes						(500.0)						—
Total repayments						(2,329.2)						(370.7)
Long-term debt borrowings, net						$	155.8					$	216.7

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Other Financing

Interest expense for the nine months ended September 30, 2025 included $3.3 million for the write-off of unamortized deferred debt issuance costs and costs associated with our first quarter financing transactions, including the 2025 Senior Credit Facility, early redemption of the 2025 Notes and the 2027 Notes, and issuance of the 2033 Notes.

For the nine months ended September 30, 2025, we paid debt issuance costs of $12.0 million associated with the 2033 Notes and the 2025 Senior Credit Facility.

NOTE 11. PENSION PLANS AND RETIREMENT BENEFITS

We sponsor domestic and foreign defined benefit pension plans for eligible employees and retirees. Most of our domestic employees participate in defined contribution plans. However, a portion of our bargaining hourly employees continue to participate in our domestic qualified defined benefit pension plans under a flat-benefit formula. Our funding policy for the qualified defined benefit pension plans is consistent with the requirements of federal laws and regulations. Our foreign subsidiaries maintain pension and other benefit plans, which are consistent with local statutory practices.

Our domestic qualified defined benefit pension plan provides that if, within three years following a change of control of Olin, any corporate action is taken or filing made in contemplation of, among other things, a plan termination or merger or other transfer of assets or liabilities of the plan, and such termination, merger, or transfer thereafter takes place, plan benefits would automatically be increased for affected participants (and retired participants) to absorb any plan surplus (subject to applicable collective bargaining requirements).

We also provide certain postretirement healthcare (medical) and life insurance benefits for eligible active and retired domestic employees. The healthcare plans are contributory with participants’ contributions adjusted annually based on medical rates of inflation and plan experience.

			Pension Benefits												Other Postretirement Benefits
			Three Months Ended September 30,												Three Months Ended September 30,
			2025						2024						2025						2024
Components of Net Periodic Benefit (Income) Cost			($ in millions)
Service cost			$	1.3					$	1.4					$	0.1					$	—
Interest cost			24.9						25.5						0.4						0.2
Expected return on plans’ assets			(31.7)						(33.5)						—						—
Amortization of prior service cost			(0.2)						(0.2)						0.3						(0.2)
Recognized actuarial loss (gain)			1.4						1.6						—						(0.1)
Net periodic benefit (income) cost			$	(4.3)					$	(5.2)					$	0.8					$	(0.1)

			Pension Benefits												Other Postretirement Benefits
			Nine Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Components of Net Periodic Benefit (Income) Cost			($ in millions)
Service cost			$	3.5					$	3.9					$	0.4					$	0.4
Interest cost			74.3						76.1						1.1						1.1
Expected return on plans’ assets			(95.1)						(101.2)						—						—
Amortization of prior service cost			(0.5)						(0.5)						0.1						(0.2)
Recognized actuarial loss			4.4						4.9						0.2						0.4
Net periodic benefit (income) cost			$	(13.4)					$	(16.8)					$	1.8					$	1.7

We made cash contributions to our international qualified defined benefit pension plans of $0.6 million and $0.9 million for the nine months ended September 30, 2025 and 2024, respectively.

NOTE 12. INCOME TAXES

The tax benefit for the three months ended September 30, 2025 was $2.2 million, resulting in a negative effective tax rate of 5.3%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to U.S. federal tax credits and

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favorable permanent salt depletion deductions, partially offset by foreign income inclusions and a change in tax contingencies. The tax benefit for the three months ended September 30, 2024 was $0.0 million, resulting in an effective tax rate of 0.0%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates, partially offset by favorable permanent salt depletion deductions and benefit from prior year tax positions.

The tax benefit for the nine months ended September 30, 2025 was $5.3 million, resulting in a negative effective tax rate of 14.4%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to U.S. federal tax credits and favorable permanent salt depletion deductions, partially offset by foreign income inclusions and a change in tax contingencies. Tax expense for the nine months ended September 30, 2024 was $36.8 million, resulting in an effective tax rate of 27.9%. The effective rate was higher than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates, partially offset by favorable permanent salt depletion deductions, a benefit from prior year tax positions, U.S. federal tax credits purchased at a discount and a benefit associated with stock-based compensation.

We account for non-refundable tax credits in accordance with ASC 740, Income Taxes, recognizing a decrease to our income tax expense. Refundable tax credits are accounted for outside the scope of ASC 740, and treated by analogy to government grants, using International Accounting Standards (IAS) 20, Accounting for Government Grants and Disclosure of Government Assistance, recognizing such grants when the Company has reasonable assurance that it will comply with the grant’s conditions and that the grant will be received.

In August 2022, the Inflation Reduction Act (IRA) was enacted and provides various beneficial credits for energy efficient related manufacturing, transportation and fuels, hydrogen/carbon recapture and renewable energy. In the second quarter of 2025, Olin realized $22.0 million of investment tax credits related to the IRA via its Hidrogenii joint venture interest and recorded a tax benefit of $2.6 million. In the third quarter of 2025, Olin determined that it qualified for the clean hydrogen production tax credit under Section 45V as part of the IRA. As a result, Olin recorded a $32.0 million reduction to cost of goods sold primarily related to Section 45V. The Company expects to continue to qualify for Section 45V through 2032.

On July 4, 2025, the One Big Beautiful Bill Act (OBBBA) was enacted in the U.S. This act introduces significant changes to tax law and other areas affecting company operations, including items such as extensions of Tax Cuts and Jobs Act provisions, changes to business interest deductions, modifications to depreciation deductions and impacts on energy tax credits. Due to a decrease in taxable income from changes to depreciation methods, business interest deductions and research and development, Olin recorded a $2.5 million tax expense in the third quarter of 2025 associated with the valuation allowance on foreign tax credits which are no longer expected to be utilized before their expiration date.

As of September 30, 2025, we had $31.8 million of gross unrecognized tax benefits, which would have impacted the effective tax rate, if recognized. The amounts of unrecognized tax benefits were as follows:

			Nine Months Ended September 30,
			2025						2024
Unrecognized Tax Benefits			($ in millions)
Balance at beginning of year			$	21.1					$	50.3
Increases for prior year tax positions			11.7						5.6
Decreases for prior year tax positions			(0.5)						(0.4)
Increases for current year tax positions			0.9						1.2
Decreases due to tax settlements			(1.4)						(1.0)
Foreign currency translation adjustments			—						0.2
Balance at end of period			$	31.8					$	55.9

As of September 30, 2025, we believe it is reasonably possible that our total amount of unrecognized tax benefits will decrease by approximately $9.7 million over the next twelve months. The anticipated reduction primarily relates to expected settlements with tax authorities and the expiration of federal, state and foreign statutes of limitation.

We operate globally and file income tax returns in numerous jurisdictions. Our tax returns are subject to examination by various federal, state and local tax authorities. Additionally, examinations are ongoing in various states and foreign jurisdictions. We believe we have adequately provided for all tax positions; however, amounts asserted by taxing authorities could be greater than our accrued position.

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For our primary tax jurisdictions, the tax years that remain subject to examination are as follows:

			Tax Years
U.S. federal income tax			2020 - 2024
U.S. state income tax			2015 - 2024
Canadian federal income tax			2018 - 2024
Brazil			2019 - 2024
Germany			2022 - 2024
China			2015 - 2024
The Netherlands			2020 - 2024

NOTE 13. DEFINED CONTRIBUTION PLAN

The Company sponsors a defined contribution plan for qualifying domestic employees (Employee Retirement Savings Plan) and a supplemental executive retirement plan as follows:

Employee Retirement Savings Plan

We sponsor a defined contribution plan for qualifying domestic employees, for which the Company contributes between 5.0% and 7.0% of the employees’ eligible compensation into a retirement account (Company Contribution). Employees generally vest in the value of the Company Contribution according to a schedule based on service.

We also match a percentage of our employees’ contributions (Company Match), which are invested in the same investment allocation as the employees’ contributions. Employees immediately vest in the Company Match.

Our contributions to the defined contribution plan were as follows:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Employee Retirement Savings Plan			($ in millions)
Company Contribution			$	9.7					$	8.0					$	29.8					$	27.4
Company Match			4.2						3.2						12.7						10.5
Total contributions			$	13.9					$	11.2					$	42.5					$	37.9

NOTE 14. STOCK-BASED COMPENSATION

Stock-based compensation granted includes stock options, performance share awards, restricted stock awards and deferred directors’ compensation. Stock-based compensation expense was as follows:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Stock Compensation Expense			($ in millions)
Stock-based compensation			$	6.3					$	6.3					$	20.8					$	17.3
Mark-to-market adjustments			2.3						0.3						(3.4)						(2.9)
Total expense			$	8.6					$	6.6					$	17.4					$	14.4

Performance Shares

Performance share awards are denominated in shares of our stock and are paid half in cash and half in stock. Payouts for performance share awards are based on two criteria: (1) 50% of the award is based on Olin’s total shareholder returns (TSR) over the applicable three-year performance cycle in relation to the TSR over the same period among a portfolio of public companies which are selected in concert with outside compensation consultants and (2) 50% of the award is based on Olin’s net income over the applicable three-year performance cycle in relation to the net income goal for such period as set by the Compensation Committee of Olin’s Board of Directors. The expense associated with performance shares is recorded based on our estimate of our performance relative to the respective target. If an employee leaves the Company before the end of the performance cycle, the performance shares may be prorated based on the number of months of the performance cycle worked and are settled in cash instead of half in cash and half in stock when the three-year performance cycle is completed.

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The fair value of each performance share award based on net income was estimated on the date of grant, using the current stock price. The fair value of each performance share award based on TSR was estimated on the date of grant, using a Monte Carlo simulation model with the following weighted average assumptions:

Grant Date Assumptions - Performance Shares			2025						2024
Risk-free interest rate			4.27		%				4.53		%
Expected volatility of Olin common stock			37		%				41		%
Expected average volatility of peer companies			35		%				37		%
Average correlation coefficient of peer companies			0.45						0.40
Expected life (years)			3.0						3.0
Grant date fair value (TSR-based award)			$	27.46					$	72.80
Grant date fair value (net income-based award)			$	27.62					$	54.07
Performance share awards granted			573,479						180,714

The risk-free interest rate was based on zero coupon U.S. Treasury securities rates for the expected life of the performance share awards. The expected volatility of Olin common stock and peer companies was based on historical stock price movements, as we believe that historical experience is the best available indicator of the expected volatility. The average correlation coefficient of peer companies was determined based on historical trends of Olin’s common stock price compared to the peer companies. Expected life of the performance share award grant was based on historical exercise and cancellation patterns, as we believe that historical experience is the best estimate of future exercise patterns.

Restricted Stock Units

During the nine months ended September 30, 2025 and 2024, Olin granted restricted stock units of 529,283 and 220,500, respectively, at a weighted average grant date fair value per share of $26.15 and $56.94, respectively. The fair value of each restricted stock unit was estimated on the date of grant using the current stock price. The awards typically vest ratably, on an annual basis, over three years, but not less than one year.

Stock Options

During the nine months ended September 30, 2025, Olin granted no stock options. During the nine months ended September 30, 2024, Olin granted 606,157 of stock options at a weighted-average grant date fair value per option of $24.79 and a weighted-average exercise price of $53.43. The fair value of each stock option granted, which typically vests ratably over three years, but not less than one year, was estimated on the date of grant, using the Black-Scholes option-pricing model.

NOTE 15. SHAREHOLDERS’ EQUITY

On December 11, 2024, our Board of Directors approved a share repurchase program with a $1.3 billion authorization (2024 Repurchase Authorization). The Board of Directors previously authorized share repurchases with a $2.0 billion authorization on July 28, 2022 (2022 Repurchase Authorization). The 2024 Repurchase Authorization and 2022 Repurchase Authorization will terminate upon the purchase of $1.3 billion and $2.0 billion of common stock, respectively.

For the nine months ended September 30, 2025 and 2024, 1.7 million and 4.9 million shares, respectively, of common stock were repurchased and retired at a total value of $40.4 million and $256.8 million, respectively. As of September 30, 2025, a cumulative total of 26.8 million shares of common stock have been repurchased and retired at a total value of $1,341.1 million under the 2022 Repurchase Authorization program, and $658.9 million of common stock remained authorized to be repurchased under the 2022 Repurchase Authorization program. As of September 30, 2025, there have been no repurchases under the 2024 Repurchase Authorization program and $1.3 billion remained available.

We issued less than 0.1 million and 0.9 million shares representing stock options exercised for the nine months ended September 30, 2025 and 2024, respectively, with a total value of $2.1 million and $22.6 million, respectively.

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The following table represents the activity included in accumulated other comprehensive loss:

			Foreign Currency Translation						Cash Flow Hedges						Pension and Postretirement Benefits						Total
Accumulated Other Comprehensive Loss			($ in millions)
Balance at January 1, 2024			$	(39.7)					$	(18.4)					$	(438.2)					$	(496.3)
Unrealized (losses) gains
First quarter			(2.3)						(3.0)						—						(5.3)
Second quarter			(2.5)						17.1						—						14.6
Third quarter			2.3						(1.0)						—						1.3
Reclassification adjustments of losses into income
First quarter			—						13.3						1.6						14.9
Second quarter			—						5.3						1.9						7.2
Third quarter			—						7.2						1.1						8.3
Tax provision
First quarter			—						(2.6)						(0.4)						(3.0)
Second quarter			—						(5.6)						(0.5)						(6.1)
Third quarter			—						(1.5)						(0.3)						(1.8)
Net change			(2.5)						29.2						3.4						30.1
Balance at September 30, 2024			$	(42.2)					$	10.8					$	(434.8)					$	(466.2)
Balance at January 1, 2025			$	(45.9)					$	7.8					$	(412.0)					$	(450.1)
Unrealized (losses) gains
First quarter			(1.2)						34.4						—						$	33.2
Second quarter			(2.2)						(13.5)						—						(15.7)
Third quarter			(9.6)						(11.3)						—						(20.9)
Reclassification adjustments of (gains) losses into income
First quarter			—						(8.1)						1.2						(6.9)
Second quarter			—						(12.8)						1.5						(11.3)
Third quarter			—						8.5						1.5						10.0
Tax (provision) benefit
First quarter			—						(6.5)						(0.3)						(6.8)
Second quarter			—						6.5						(0.3)						6.2
Third quarter			—						0.6						(0.5)						0.1
Net change			(13.0)						(2.2)						3.1						(12.1)
Balance at September 30, 2025			$	(58.9)					$	5.6					$	(408.9)					$	(462.2)

Cost of goods sold included reclassification adjustments for realized gains and losses on derivative contracts from accumulated other comprehensive loss.

Non-operating pension income included the amortization of prior service costs and actuarial losses from accumulated other comprehensive loss.

NOTE 16. SEGMENT INFORMATION

The chief operating decision maker (CODM) is the individual, or group of individuals, who assess financial performance and determines resource allocation. Management has identified our Chief Executive Officer (CEO) as the CODM. In arriving at this conclusion, we considered that the individual who receives the relevant financial information, which is primarily provided in the form of segment operations reviews, is ultimately our CEO. Further, our CEO assesses the reasonableness of resource allocation, primarily in the form of capital allocation and budgetary analysis, and reviews segment results and resource allocation summaries prepared by segment management, consistent with their view of the business as a whole.

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We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes, and includes the results of non-consolidated affiliates in segment results consistent with management’s monitoring of the operating segments. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy, and Winchester. The three operating segments reflect the organization used by our management for purposes of allocating resources and assessing performance, and represents our reportable segments. Chlorine and caustic soda used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment.

Cost of goods sold at Corporate is primarily attributed to environmental expense. Other segment items for each reportable segment includes selling, general and administrative expenses and earnings (losses) from non-consolidated affiliates. Segment assets include only those assets which are directly identifiable to an operating segment. Assets in the corporate/other segment primarily include cash and cash equivalents, deferred taxes and other assets. Sales are attributed to geographic areas based on the customer location.

			Three Months Ended September 30, 2025
			Chlor Alkali Products and Vinyls						Epoxy						Winchester						Corp/Other						Totals
Segment Detail			($ in millions)
Sales			$	924.0					$	349.6					$	439.6					$	—					$	1,713.2
Cost of goods sold			758.0						367.4						398.5						5.9						1,529.8
Gross margin			166.0						(17.8)						41.1						(5.9)						183.4
Other segment items			(38.4)						(14.4)						(21.8)						(24.5)						(99.1)
Restructuring charges			—						—						—						(2.9)						(2.9)
Other operating income			—						—						—						0.4						0.4
Interest expense			—						—						—						(46.8)						(46.8)
Interest income			—						—						—						1.6						1.6
Non-operating pension income			—						—						—						4.9						4.9
Income (loss) before taxes			$	127.6					$	(32.2)					$	19.3					$	(73.2)					$	41.5
Other Items
Depreciation and amortization expense			$	109.0					$	13.2					$	7.8					$	3.8					$	133.8
Capital spending			56.2						3.3						10.3						1.3						71.1
Assets			5,203.8						923.8						924.5						548.8						7,600.9
Segment Sales by Geography
United States			$	624.7					$	139.5					$	371.9					$	—					$	1,136.1
Europe			48.4						88.1						22.8						—						159.3
Other foreign			250.9						122.0						44.9						—						417.8
Total sales			$	924.0					$	349.6					$	439.6					$	—					$	1,713.2

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			Nine Months Ended September 30, 2025
			Chlor Alkali Products and Vinyls						Epoxy						Winchester						Corp/Other						Totals
Segment Detail			($ in millions)
Sales			$	2,828.0					$	1,012.5					$	1,275.2					$	—					$	5,115.7
Cost of goods sold			2,431.8						1,052.5						1,143.7						17.5						4,645.5
Gross margin			396.2						(40.0)						131.5						(17.5)						470.2
Other segment items			(125.4)						(44.3)						(64.4)						(62.6)						(296.7)
Restructuring charges			—						—						—						(14.3)						(14.3)
Other operating income			—						—						—						0.2						0.2
Interest expense			—						—						—						(142.1)						(142.1)
Interest income			—						—						—						4.0						4.0
Non-operating pension income			—						—						—						15.5						15.5
Income (loss) before taxes			$	270.8					$	(84.3)					$	67.1					$	(216.8)					$	36.8
Other Items
Depreciation and amortization expense			$	322.5					$	39.1					$	25.2					$	9.1					$	395.9
Capital spending			108.0						16.1						33.1						6.3						163.5
Assets			5,203.8						923.8						924.5						548.8						7,600.9
Segment Sales by Geography
United States			$	1,935.8					$	424.4					$	1,115.0					$	—					$	3,475.2
Europe			123.6						283.3						55.8						—						462.7
Other foreign			768.6						304.8						104.4						—						1,177.8
Total sales			$	2,828.0					$	1,012.5					$	1,275.2					$	—					$	5,115.7

			Three Months Ended September 30, 2024
			Chlor Alkali Products and Vinyls						Epoxy						Winchester						Corp/Other						Totals
Segment Detail			($ in millions)
Sales			$	871.6					$	285.1					$	432.8					$	—					$	1,589.5
Cost of goods sold			778.7						313.2						356.8						6.3						1,455.0
Gross margin			92.9						(28.1)						76.0						(6.3)						134.5
Other segment items			(47.6)						(14.7)						(22.6)						(26.8)						(111.7)
Restructuring charges			—						—						—						(7.9)						(7.9)
Other operating income			—						—						—						0.6						0.6
Interest expense			—						—						—						(48.4)						(48.4)
Interest income			—						—						—						1.0						1.0
Non-operating pension income			—						—						—						6.7						6.7
Income (loss) before taxes			$	45.3					$	(42.8)					$	53.4					$	(81.1)					$	(25.2)
Other Items
Depreciation and amortization expense			$	106.5					$	13.7					$	8.5					$	1.5					$	130.2
Capital spending			31.2						4.6						8.8						0.1						44.7
Assets			5,307.7						924.5						797.5						488.6						7,518.3
Segment Sales by Geography
United States			$	616.9					$	136.2					$	376.9					$	—					$	1,130.0
Europe			48.5						75.1						22.2						—						145.8
Other foreign			206.2						73.8						33.7						—						313.7
Total sales			$	871.6					$	285.1					$	432.8					$	—					$	1,589.5

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			Nine Months Ended September 30, 2024
			Chlor Alkali Products and Vinyls						Epoxy						Winchester						Corp/Other						Totals
Segment Detail			($ in millions)
Sales			$	2,676.5					$	944.1					$	1,248.2					$	—					$	4,868.8
Cost of goods sold			2,323.2						959.9						985.9						20.2						4,289.2
Gross margin			353.3						(15.8)						262.3						(20.2)						579.6
Other segment items			(132.1)						(41.8)						(66.4)						(67.9)						(308.2)
Restructuring charges			—						—						—						(23.0)						(23.0)
Other operating income			—						—						—						0.8						0.8
Interest expense			—						—						—						(139.6)						(139.6)
Interest income			—						—						—						2.7						2.7
Non-operating pension income			—						—						—						19.4						19.4
Income (loss) before taxes			$	221.2					$	(57.6)					$	195.9					$	(227.8)					$	131.7
Other Items
Depreciation and amortization expense			$	319.1					$	40.6					$	24.7					$	4.5					$	388.9
Capital spending			109.0						15.0						23.9						0.5						148.4
Assets			5,307.7						924.5						797.5						488.6						7,518.3
Segment Sales by Geography
United States			$	1,924.0					$	474.3					$	1,110.1					$	—					$	3,508.4
Europe			129.3						239.3						69.7						—						438.3
Other foreign			623.2						230.5						68.4						—						922.1
Total sales			$	2,676.5					$	944.1					$	1,248.2					$	—					$	4,868.8

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Segment Sales by Product Line			($ in millions)
Chlor Alkali Products and Vinyls
Caustic soda			$	410.2					$	352.1					$	1,232.1					$	1,084.6
Chlorine, chlorine-derivatives and other products			513.8						519.5						1,595.9						1,591.9
Total Chlor Alkali Products and Vinyls			924.0						871.6						2,828.0						2,676.5
Epoxy
Aromatics and allylics			128.5						105.8						400.3						389.0
Epoxy resins			221.1						179.3						612.2						555.1
Total Epoxy			349.6						285.1						1,012.5						944.1
Winchester
Commercial			166.0						191.6						491.6						656.4
Military and law enforcement(1)			273.6						241.2						783.6						591.8
Total Winchester			439.6						432.8						1,275.2						1,248.2
Total sales			$	1,713.2					$	1,589.5					$	5,115.7					$	4,868.8

(1)    For the three months ended September 30, 2025 and 2024, revenue recognized over time represented $90.4 million and $63.0 million, respectively, and for the nine months ended September 30, 2025 and 2024, revenue recognized over time represented $243.3 million and $120.6 million, respectively, associated with governmental contracts within our Winchester business.

NOTE 17. ENVIRONMENTAL

We are party to various government and private environmental actions associated with past manufacturing facilities and former waste disposal sites. The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $154.7 million, $156.5 million and $154.2 million at September 30, 2025,

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December 31, 2024 and September 30, 2024, respectively, of which $124.7 million, $126.5 million and $122.2 million, respectively, were classified as other noncurrent liabilities.

Environmental provisions charged to income, which are included in costs of goods sold, were as follows:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Environmental Expense			($ in millions)
Provisions charged to income			$	5.5					$	7.2					$	15.3					$	19.4
Insurance recoveries(1)			(1.0)						—						(1.0)						—
Environmental expense			$	4.5					$	7.2					$	14.3					$	19.4

(1) Insurance recoveries for costs incurred and expensed in prior periods.

Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other Potentially Responsible Parties (PRPs), our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position, cash flows or results of operations.

NOTE 18. COMMITMENTS AND CONTINGENCIES

We, and our subsidiaries, are defendants in various legal actions (including proceedings based on alleged exposures to asbestos) incidental to our past and current business activities. As of September 30, 2025, December 31, 2024 and September 30, 2024, our condensed balance sheets included accrued liabilities for these other legal actions of $18.7 million, $19.7 million and $14.1 million, respectively. These liabilities do not include costs associated with legal representation. Based on our analysis, and considering the inherent uncertainties associated with litigation, we do not believe that it is reasonably possible that these legal actions will materially adversely affect our financial position, cash flows or results of operations.

During the ordinary course of our business, contingencies arise resulting from an existing condition, situation or set of circumstances involving an uncertainty as to the realization of a possible gain contingency. In certain instances, such as environmental projects, we are responsible for managing the cleanup and remediation of an environmental site. There exists the possibility of recovering a portion of these costs from other parties. We account for gain contingencies in accordance with the provisions of ASC 450 “Contingencies” and, therefore, do not record gain contingencies and recognize income until it is earned and realizable.

NOTE 19. DERIVATIVE FINANCIAL INSTRUMENTS

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks. ASC 815 “Derivatives and Hedging” (ASC 815) requires an entity to recognize all derivatives as either assets or liabilities in the condensed balance sheets and measure those instruments at fair value. In accordance with ASC 815, we designate derivative contracts as cash flow hedges of forecasted purchases of commodities and forecasted interest payments related to variable-rate borrowings and designate certain interest rate swaps as fair value hedges of fixed-rate borrowings. We do not enter into any derivative instruments for trading or speculative purposes.

Energy costs, including electricity and natural gas, and certain raw materials used in our production processes are subject to price volatility. Depending on market conditions, we may enter into futures contracts, forward contracts, commodity swaps and put and call option contracts in order to reduce the impact of commodity price fluctuations. The majority of our commodity derivatives expire within one year.

We actively manage currency exposures that are associated with net monetary asset positions, currency purchases and sales commitments denominated in foreign currencies and foreign currency denominated assets and liabilities created in the normal course of business. We enter into forward sales and purchase contracts to manage currency risk to offset our net exposures, by currency, related to the foreign currency denominated monetary assets and liabilities of our operations. All of the currency derivatives expire within one year and are for U.S. dollar (USD) equivalents. The counterparties to the forward contracts are large financial institutions; however, the risk of loss to us in the event of nonperformance by a counterparty could

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be significant to our financial position, cash flows or results of operations. We had the following notional amounts of outstanding forward contracts to buy and sell foreign currency:

			September 30, 2025						December 31, 2024						September 30, 2024
Notional Value - Foreign Currency			($ in millions)
Buy			$	—					$	—					$	—
Sell			141.0						133.7						148.8

Cash Flow Hedges

For derivative instruments that are designated and qualify as a cash flow hedge, the change in fair value of the derivative is recognized as a component of other comprehensive income (loss) until the hedged item is recognized in earnings.

We had the following notional amounts of outstanding commodity contracts that were entered into to hedge forecasted purchases:

			September 30, 2025						December 31, 2024						September 30, 2024
Notional Value - Commodity			($ in millions)
Natural gas			$	66.1					$	57.4					$	64.3
Ethane			37.4						22.6						24.3
Metals			130.7						124.5						118.6
Total notional			$	234.2					$	204.5					$	207.2

As of September 30, 2025, the counterparties to these commodity contracts were Wells Fargo Bank, N.A., Citibank, N.A., JPMorgan Chase Bank, National Association, Toronto Dominion Bank and Bank of America Corporation, all of which are major financial institutions.

We use cash flow hedges for certain raw material and energy costs such as copper, zinc, ethane, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations associated with forecasted purchases of raw materials and energy used in our manufacturing process. At September 30, 2025, we had open derivative contract positions through 2028. If all open futures contracts had been settled on September 30, 2025, we would have recognized a pretax gain of $7.4 million.

If commodity prices were to remain at September 30, 2025 levels, approximately $3.7 million of deferred gains, net of tax, would be reclassified into earnings during the next twelve months. The actual effect on earnings will be dependent on actual commodity prices when the forecasted transactions occur.

Fair Value Hedges

We use interest rate swaps as a means of managing interest expense and floating interest rate exposure to optimal levels. For derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings. We include the gain or loss on the hedged items (fixed-rate borrowings) in the same line item, interest expense, as the offsetting loss or gain on the related interest rate swaps. There were no outstanding interest rate swaps at September 30, 2025, December 31, 2024 and September 30, 2024.

Financial Statement Impacts

We present our derivative assets and liabilities in our condensed balance sheets on a net basis whenever we have a legally enforceable master netting agreement with the counterparty to our derivative contracts. We use these agreements to manage and substantially reduce our potential counterparty credit risk.

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The following table summarizes the location and fair value of the derivative instruments on our condensed balance sheets:

						September 30, 2025						December 31, 2024						September 30, 2024
			Balance Sheet Location			($ in millions)
Current Assets
Commodity contracts			Other current assets			$	8.7					$	11.9					$	16.0
Foreign currency contracts			Other current assets			0.1						2.6						—
Noncurrent Assets
Commodity contracts			Other assets			2.6						2.0						4.7
Total derivative assets(1)						$	11.4					$	16.5					$	20.7
Current Liabilities
Commodity contracts			Accrued liabilities			$	3.9					$	3.3					$	6.4
Foreign currency contracts			Accrued liabilities			1.1						—						3.4
Noncurrent Liabilities
Commodity contracts			Other liabilities			—						0.4						—
Total derivative liabilities(1)						$	5.0					$	3.7					$	9.8

(1)     Does not include the impact of cash collateral received from or provided to counterparties, if any.

The following table summarizes the effects of derivative instruments on our condensed statements of operations:

									Amount of Gain (Loss) for the
									Three Months Ended September 30,												Nine Months Ended September 30,
									2025						2024						2025						2024
			Location of Gain (Loss)						($ in millions)
Cash Flow Hedges
Commodity contracts			Other comprehensive income (loss)						$	(11.3)					$	(1.0)					$	9.6					$	13.1
Commodity contracts			Cost of goods sold						(8.5)						(7.2)						12.4						(25.8)
Not Designated as Hedging Instruments
Foreign exchange contracts			Selling and administrative						(3.5)						(6.1)						(17.8)						3.4

Credit Risk and Collateral

By using derivative instruments, we are exposed to credit and market risk. If a counterparty fails to fulfill its performance obligations under a derivative contract, our credit risk will equal the fair value gain in a derivative. Generally, when the fair value of a derivative contract is positive, this indicates that the counterparty owes us, thus creating a repayment risk for us. When the fair value of a derivative contract is negative, we owe the counterparty and, therefore, assume no repayment risk. We minimize the credit (or repayment) risk in derivative instruments by entering into transactions with high-quality counterparties. We monitor our positions and the credit ratings of our counterparties, and we do not anticipate non-performance by the counterparties.

Based on the agreements with our various counterparties, cash collateral is required to be provided when the net fair value of the derivatives, with the counterparty, exceeds a specific threshold. If the threshold is exceeded, cash is either provided by the counterparty to us if the value of the derivatives is our asset, or cash is provided by us to the counterparty if the value of the derivatives is our liability. As of September 30, 2025, December 31, 2024 and September 30, 2024, this threshold was not exceeded. In all instances where we are party to a master netting agreement, we offset the receivable or payable recognized upon payment of cash collateral against the fair value amounts recognized for derivative instruments that have also been offset under such master netting agreements.

NOTE 20. FAIR VALUE MEASUREMENTS

Fair value is defined as the price at which an asset could be exchanged in a current transaction between knowledgeable, willing parties or the amount that would be paid to transfer a liability to a new obligor, not the amount that would be paid to

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settle the liability with the creditor. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models are applied. These valuation techniques involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market and the instruments’ complexity.

Assets and liabilities recorded at fair value in the condensed balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair value. Hierarchical levels, defined by ASC 820 “Fair Value Measurement” (ASC 820), and directly related to the amount of subjectivity associated with the inputs to fair valuation of these assets and liabilities, are as follows:

Level 1 — Inputs were unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date.

Level 2 — Inputs (other than quoted prices included in Level 1) were either directly or indirectly observable for the asset or liability through correlation with market data at the measurement date and for the duration of the instrument’s anticipated life.

Level 3 — Inputs reflected management’s best estimate of what market participants would use in pricing the asset or liability at the measurement date. Consideration was given to the risk inherent in the valuation technique and the risk inherent in the inputs to the model.

We are required to separately disclose assets and liabilities measured at fair value on a recurring basis, from those measured at fair value on a nonrecurring basis. Nonfinancial assets measured at fair value on a nonrecurring basis are intangible assets and goodwill, which are reviewed for impairment annually in the fourth quarter and/or when circumstances or other events indicate that impairment may have occurred.

Commodity Contracts

We use commodity derivative contracts for certain raw materials and energy costs such as copper, zinc, ethane, electricity and natural gas to provide a measure of stability in managing our exposure to price fluctuations. Commodity contract financial instruments were valued primarily based on prices and other relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for commodities. All commodity financial instruments were valued as a Level 2 under the fair value measurements hierarchy.

Foreign Currency Contracts

We enter into forward sales and purchase contracts to manage currency risk resulting from purchase and sale commitments denominated in foreign currencies. Foreign currency contract financial instruments were valued primarily based on relevant information observable in market transactions involving identical or comparable assets or liabilities including both forward and spot prices for currencies. All foreign currency contract financial instruments were valued as a Level 2 under the fair value measurements hierarchy.

Financial Instruments

The carrying values of cash and cash equivalents, accounts receivable and accounts payable approximated fair values due to the short-term maturities of these instruments. Since our long-term debt instruments may not be actively traded, the inputs used to measure the fair value of our long-term debt are based on current market rates for debt of similar risk and maturities and is classified as Level 2 in the fair value measurement hierarchy. As of September 30, 2025, December 31, 2024 and September 30, 2024, the fair value measurements of debt were $3,012.4 million, $2,779.0 million and $2,887.5 million, respectively.

Nonrecurring Fair Value Measurements

In addition to assets and liabilities that are recorded at fair value on a recurring basis, we record assets and liabilities at fair value on a nonrecurring basis as required by ASC 820. There were no assets or liabilities measured at fair value on a nonrecurring basis as of September 30, 2025, December 31, 2024 or September 30, 2024.

ITEM 2.  MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

BUSINESS BACKGROUND

Olin Corporation (Olin, the Company, we or our) is a Virginia corporation, incorporated in 1892, having its principal executive offices in Clayton, MO. We are a leading vertically integrated global manufacturer and distributor of chemical

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products and a leading U.S. manufacturer of ammunition. Our operations are concentrated in three business segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. All of our business segments are capital-intensive manufacturing businesses. The Chlor Alkali Products and Vinyls segment manufactures and sells chlorine and caustic soda, ethylene dichloride (EDC) and vinyl chloride monomer, methyl chloride, methylene chloride, chloroform, carbon tetrachloride, perchloroethylene, hydrochloric acid, hydrogen, bleach products and potassium hydroxide. The Epoxy segment produces and sells a full range of epoxy materials and precursors, including aromatics (acetone and phenol), allyl chloride, epichlorohydrin, liquid epoxy resins, solid epoxy resins and formulated solutions products such as converted epoxy resins and additives. The Winchester segment produces and sells sporting ammunition, reloading components, small caliber military ammunition and components, industrial cartridges and clay targets.

EXECUTIVE SUMMARY

Overview

Net income (loss) for the three and nine months ended September 30, 2025 was $42.8 million and $42.9 million, respectively, compared to $(24.9) million and $97.9 million, for the same prior year periods. The three and nine months ended September 30, 2024, included $109.4 million of additional costs, unabsorbed fixed manufacturing costs, and reduced profit from lost sales associated with Hurricane Beryl in the prior year. The remaining decrease in net income for the three and nine months ended September 30, 2025 was primarily due to lower operating results across all of our business segments. Diluted net income (loss) per share was $0.37 for both the three and nine months ended September 30, 2025, compared to $(0.21) and $0.81 in the prior year periods, respectively.

In the third quarter of 2025, Olin determined that it qualified for the clean hydrogen production tax credit under Section 45V as part of the Inflation Reduction Act of 2022. We received notice of our provisional carbon dioxide emissions rate from the United States Department of Energy, which was a major milestone for recognition. The 45V tax credit is available for qualified clean hydrogen produced and sold during the 10-year period beginning on the date the qualified clean hydrogen production facility was originally placed in service. Since the 45V tax credit is refundable, we account for the 45V tax credit under a government grant model. As a result, during the third quarter of 2025 Olin recorded a $32.0 million reduction to cost of goods sold primarily related to the sale and use of hydrogen produced at certain of our chlor alkali plants. We expect an annual pretax benefit of $15 million to $20 million for years 2026 through 2028, with lower amounts through 2032.

Chlor Alkali Products and Vinyls reported segment income was $127.6 million and $270.8 million for the three and nine months ended September 30, 2025, respectively. Chlor Alkali Products and Vinyls segment income included the $32.0 million pretax benefit primarily related to the 45V tax credit. The third quarter 2024 segment income included a $76.7 million penalty associated with Hurricane Beryl. The remaining decrease in segment income from the comparable prior year periods was primarily due to lower EDC pricing, partially offset by higher caustic soda pricing and higher volumes.

Epoxy reported a segment loss of $32.2 million and $84.3 million for the three and nine months ended September 30, 2025, respectively. The third quarter 2024 segment loss included a $32.7 million penalty associated with Hurricane Beryl. The remaining decrease in Epoxy segment results as compared to the prior year periods was primarily due to higher operating costs, including unabsorbed fixed manufacturing costs incurred from planned inventory reductions, partially offset by improved volumes. Global epoxy demand remains weak, and our U.S. and European Epoxy businesses remains significantly challenged by subsidized Asian competition. Our anti-dumping initiatives have provided limited benefits to date.

Winchester reported segment income of $19.3 million and $67.1 million for the three and nine months ended September 30, 2025, respectively. Winchester segment results were lower than the comparable prior year periods due to decreased commercial ammunition sales volumes and pricing, along with higher raw material and operating costs, including commodity metal and propellant costs, partially offset by higher domestic and international military sales and military project revenue.

Liquidity and Share Repurchases

During the nine months ended September 30, 2025, we repurchased and retired 1.7 million shares of common stock at a total value of $40.4 million. As of September 30, 2025, we had $1,958.9 million of remaining authorization to repurchase shares of our common stock under our 2022 Repurchase Authorization and 2024 Repurchase Authorization (both defined below) programs.

On March 14, 2025, we issued $600.0 million aggregate principal amount of 6.625% senior notes due April 1, 2033 (2033 Notes), in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended.

On March 14, 2025, we entered into a new $1,850.0 million senior credit facility (2025 Senior Credit Facility), which increased the borrowing limit of our then-existing credit facility by $300.0 million and extended the maturity date from October 11, 2027 to March 14, 2030. Pursuant to the agreement, the aggregate principal amount under our term loan facility increased

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from $350.0 million to $650.0 million and the aggregate principal amount under our revolving credit facility remained at $1,200.0 million. The term loan was fully drawn on the closing date.

During the nine months ended September 30, 2025, we had net borrowings of $155.8 million. Proceeds from the 2033 Notes, together with borrowings under the 2025 Senior Credit Facility, were used to redeem the $108.6 million 9.50% senior notes due 2025 (2025 Notes), redeem the $500.0 million 5.125% senior notes due 2027 (2027 Notes), refinance the then-existing $1,550.0 million senior credit facility (2022 Senior Credit Facility) comprised of $505.0 million of borrowings under the prior revolving credit facility and $332.5 million of borrowings under the prior term loan facility, and pay related fees and expenses.

International Trade

The ultimate impact of tariffs and trade flows remains highly uncertain. While we are continuing to monitor the situation, as of the date of this filing, the direct impact from current tariffs has not been significant to our chemicals businesses. Our chemicals businesses generally source and sell where we produce. An exception to this would be potential retaliatory tariffs on caustic soda and EDC exports, which could alter the economics rapidly within the respective countries. Additionally, although Winchester procures the majority of metals domestically, we will still realize tariff driven price inflation for the domestic supply of copper, steel and tungsten products. Winchester will also realize secondary effects from suppliers consuming tariff impacted metals in their end products.

Other Items

On April 18, 2025, Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for total consideration of $55.8 million, subject to normal post-closing adjustments. The acquisition, which included AMMO Inc.’s brass shellcase capabilities and its 185,000 square foot production facility located in Manitowoc, WI, is included in Olin’s Winchester segment. The acquisition was financed with cash on hand.

On September 18, 2025, we announced a mutual decision with Mitsui & Co., Ltd. to end our joint venture, Blue Water Alliance, by the end of 2025. This decision was made to evolve our EDC participation by emphasizing longer-term structural opportunities that enhance value and optionality.

CONSOLIDATED RESULTS OF OPERATIONS

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
			($ in millions, except per share data)
Sales			$	1,713.2					$	1,589.5					$	5,115.7					$	4,868.8
Cost of goods sold			1,529.8						1,455.0						4,645.5						4,289.2
Gross margin			183.4						134.5						470.2						579.6
Selling and administrative			98.1						111.7						294.3						308.2
Restructuring charges			2.9						7.9						14.3						23.0
Other operating income			0.4						0.6						0.2						0.8
Operating income			82.8						15.5						161.8						249.2
Losses of non-consolidated affiliates			(1.0)						—						(2.4)						—
Interest expense			(46.8)						(48.4)						(142.1)						(139.6)
Interest income			1.6						1.0						4.0						2.7
Non-operating pension income			4.9						6.7						15.5						19.4
Income (loss) before taxes			41.5						(25.2)						36.8						131.7
Income tax (benefit) provision			(2.2)						—						(5.3)						36.8
Net income (loss)			43.7						$	(25.2)					42.1						94.9
Net income (loss) attributable to noncontrolling interests			0.9						(0.3)						(0.8)						(3.0)
Net income (loss) attributable to Olin Corporation			$	42.8					$	(24.9)					$	42.9					$	97.9
Net income (loss) attributable to Olin Corporation per common share:
Basic			$	0.37					$	(0.21)					$	0.37					$	0.83
Diluted			$	0.37					$	(0.21)					$	0.37					$	0.81

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Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

Sales for the three months ended September 30, 2025 were $1,713.2 million compared to $1,589.5 million in the same period last year, an increase of $123.7 million, or 8%. Chlor Alkali Products and Vinyls sales increased by $52.4 million primarily due to higher volumes, partially offset by lower pricing. Epoxy sales increased by $64.5 million, primarily due to higher volumes, including the impact of Hurricane Beryl in 2024, partially offset by lower pricing. Winchester sales increased by $6.8 million, primarily due to increased sales to military customers and military project revenue, partially offset by lower commercial ammunition sales.

Gross margin increased $48.9 million for the three months ended September 30, 2025 compared to the prior year period. Chlor Alkali Products and Vinyls gross margin increased $73.1 million and Epoxy gross margin increased $10.3 million, both primarily due to the impact of Hurricane Beryl in 2024. Winchester gross margin decreased by $34.9 million primarily due to lower commercial sales volumes and pricing. Gross margin as a percentage of sales increased to 11% during the three months ended September 30, 2025 from 8% during the three months ended September 30, 2024.

Selling and administration expenses for the three months ended September 30, 2025 were $98.1 million, a decrease of $13.6 million from the prior year period. The decrease was primarily due to a favorable foreign currency impact of $7.0 million, lower legal and legal-related settlement expense of $6.3 million and lower consulting and contract services of $5.2 million, partially offset by higher variable incentive compensation costs of $4.8 million, which includes mark-to-market adjustments on stock-based compensation expense. Selling and administration expenses as a percentage of sales was 6% and 7% for the three months ended September 30, 2025 and 2024, respectively.

Restructuring charges for the three months ended September 30, 2025 and 2024 were $2.9 million and $7.9 million, respectively. Restructuring charges include facility exit costs, lease and other contract termination costs, and employee severance and related benefits costs

Losses of non-consolidated affiliates relate to Olin’s equity share of the Hidrogenii, LLC joint venture.

Non-operating pension income includes all components of pension and other postretirement net periodic benefit (income) cost, other than service costs. Non-operating pension income was lower for the three months ended September 30, 2025, compared to the prior year period, primarily due to a lower assumption for the long-term rate of return on plan assets.

The tax benefit for the three months ended September 30, 2025 was $2.2 million, resulting in a negative effective tax rate of 5.3%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to U.S. federal tax credits and favorable permanent salt depletion deductions, partially offset by foreign income inclusions and a change in tax contingencies. The tax benefit for the three months ended September 30, 2024 was $0.0 million, resulting in an effective tax rate of 0.0%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates, partially offset by favorable permanent salt depletion deductions and benefit from prior year tax positions.

Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

Sales for the nine months ended September 30, 2025 were $5,115.7 million compared to $4,868.8 million in the same period last year, an increase of $246.9 million, or 5%. Chlor Alkali Products and Vinyls sales increased by $151.5 million primarily due to higher volumes, partially offset by lower pricing. Epoxy sales increased by $68.4 million, primarily due to higher volumes, including the impact of Hurricane Beryl in 2024, partially offset by lower pricing. Winchester sales increased by $27.0 million, primarily due to increased sales to military customers and military project revenue, partially offset by lower commercial ammunition sales.

Gross margin decreased $109.4 million for the nine months ended September 30, 2025 compared to the prior year period. Winchester gross margin decreased by $130.8 million primarily due to lower commercial sales volumes and pricing, and higher raw material and operating costs, including commodity metal and propellant costs. Epoxy gross margin decreased by $24.2 million primarily due to higher operating costs, including unabsorbed fixed manufacturing costs incurred from planned inventory reductions and planned maintenance turnaround expenses, partially offset by the impact of Hurricane Beryl in 2024. Chlor Alkali Products and Vinyls gross margin increased by $42.9 million primarily due to the impact of Hurricane Beryl in 2024, higher volumes and a benefit primarily related to the 45V tax credit, partially offset by lower pricing and higher raw material and operating costs. Gross margin as a percentage of sales decreased to 9% during the nine months ended September 30, 2025 from 12% during the nine months ended September 30, 2024.

Selling and administration expenses for the nine months ended September 30, 2025 were $294.3 million, a decrease of $13.9 million from the prior year period. The decrease was primarily due to a favorable foreign currency impact of $16.7 million and lower consulting and contract services of $6.8 million, partially offset by higher variable incentive compensation

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costs of $9.3 million, which includes mark-to-market adjustments on stock-based compensation expense. Selling and administration expenses as a percentage of sales was 6% for both the nine months ended September 30, 2025 and 2024.

Restructuring charges for the nine months ended September 30, 2025 and 2024 were $14.3 million and $23.0 million, respectively. Restructuring charges include facility exit costs, lease and other contract termination costs, and employee severance and related benefits costs.

Losses of non-consolidated affiliates relate to Olin’s equity share of the Hidrogenii, LLC joint venture.

Interest expense for the nine months ended September 30, 2025 increased $2.5 million from the prior year period, primarily due to the write-off of unamortized deferred debt issuance costs and costs associated with our first quarter financing transactions, including the 2025 Senior Credit Facility, early redemption of the 2025 Notes and the 2027 Notes, and issuance of the 2033 Notes.

Non-operating pension income includes all components of pension and other postretirement net periodic benefit (income) cost, other than service costs. Non-operating pension income was lower for the nine months ended September 30, 2025, compared to the prior year period, primarily due to a lower assumption for the long-term rate of return on plan assets.

The tax benefit for the nine months ended September 30, 2025 was $5.3 million, resulting in a negative effective tax rate of 14.4%. The effective rate was lower than the 21.0% U.S. federal statutory rate, primarily due to U.S. federal tax credits and favorable permanent salt depletion deductions, partially offset by foreign income inclusions and a change in tax contingencies. Tax expense for the nine months ended September 30, 2024 was $36.8 million, resulting in an effective tax rate of 27.9%. The effective rate was higher than the 21.0% U.S. federal statutory rate, primarily due to state income tax, foreign income inclusions, a change in tax contingencies and remeasurement of deferred taxes due to an increase in our state effective tax rates, partially offset by favorable permanent salt depletion deductions, a benefit from prior year tax positions, U.S. federal tax credits purchased at a discount and a benefit associated with stock-based compensation.

SEGMENT RESULTS

We define segment results as income (loss) before interest expense, interest income, other operating income (expense), non-operating pension income, other income and income taxes, and includes the results of non-consolidated affiliates in segment results consistent with management’s monitoring of the operating segments. We have three operating segments: Chlor Alkali Products and Vinyls, Epoxy and Winchester. The three operating segments reflect the organization used by our management for purposes of allocating resources and assessing performance. Chlorine and caustic soda used in our Epoxy segment is transferred at cost from the Chlor Alkali Products and Vinyls segment.

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Segment Detail			($ in millions)
Sales
Chlor Alkali Products and Vinyls			$	924.0					$	871.6					$	2,828.0					$	2,676.5
Epoxy			349.6						285.1						1,012.5						944.1
Winchester			439.6						432.8						1,275.2						1,248.2
Total sales			$	1,713.2					$	1,589.5					$	5,115.7					$	4,868.8
Income (loss) before taxes
Chlor Alkali Products and Vinyls			$	127.6					$	45.3					$	270.8					$	221.2
Epoxy			(32.2)						(42.8)						(84.3)						(57.6)
Winchester			19.3						53.4						67.1						195.9
Corporate/other:
Environmental expense			(4.5)						(7.2)						(14.3)						(19.4)
Other corporate and unallocated costs			(25.9)						(25.9)						(65.8)						(68.7)
Restructuring charges			(2.9)						(7.9)						(14.3)						(23.0)
Other operating income			0.4						0.6						0.2						0.8
Interest expense			(46.8)						(48.4)						(142.1)						(139.6)
Interest income			1.6						1.0						4.0						2.7
Non-operating pension income			4.9						6.7						15.5						19.4
Income (loss) before taxes			$	41.5					$	(25.2)					$	36.8					$	131.7

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Chlor Alkali Products and Vinyls

Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

Chlor Alkali Products and Vinyls sales for the three months ended September 30, 2025 were $924.0 million compared to $871.6 million for the same period in 2024, an increase of $52.4 million, or 6%. The sales increase was primarily due to higher volumes, partially offset by lower pricing.

Chlor Alkali Products and Vinyls segment income was $127.6 million for the three months ended September 30, 2025 compared to $45.3 million for the same period in 2024, an increase of $82.3 million. The increase in segment results was due to the negative impact of Hurricane Beryl in 2024 resulting in additional costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($76.7 million), a benefit primarily related to the 45V tax credit ($32.0 million), higher volumes ($22.5 million) and lower costs associated with products purchased from other parties ($14.5 million). This increase was partially offset by lower pricing ($43.3 million), primarily EDC, partially offset by higher caustic soda, and higher raw material and operating costs ($20.1 million). Chlor Alkali Products and Vinyls segment results included depreciation and amortization expense of $109.0 million and $106.5 million for the three months ended September 30, 2025 and 2024, respectively.

Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

Chlor Alkali Products and Vinyls sales for the nine months ended September 30, 2025 were $2,828.0 million compared to $2,676.5 million for the same period in 2024, an increase of $151.5 million, or 6%. The sales increase was primarily due to higher volumes, partially offset by lower pricing.

Chlor Alkali Products and Vinyls segment income was $270.8 million for the nine months ended September 30, 2025 compared to $221.2 million for the same period in 2024. The increase in segment results of $49.6 million was due to the negative impact of Hurricane Beryl in 2024 resulting in additional costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($76.7 million), higher volumes ($66.0 million), lower costs associated with products purchased from other parties ($39.8 million) and a benefit primarily related to the 45V tax credit ($32.0 million). This increase was partially offset by lower pricing ($97.5 million), primarily EDC, partially offset by higher caustic soda, and higher raw material and operating costs ($67.4 million), including planned maintenance turnaround expenses. Chlor Alkali Products and Vinyls segment results included depreciation and amortization expense of $322.5 million and $319.1 million for the nine months ended September 30, 2025 and 2024, respectively.

Epoxy

Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

Epoxy sales for the three months ended September 30, 2025 were $349.6 million compared to $285.1 million for the same period in 2024, an increase of $64.5 million, or 23%. The sales increase was due to higher volumes ($83.1 million), including the impact of Hurricane Beryl in 2024, and a favorable effect of foreign currency translation ($6.2 million), partially offset by lower product pricing ($24.8 million).

Epoxy segment loss was $32.2 million for the three months ended September 30, 2025 compared to segment loss of $42.8 million for the same period in 2024. The increase in segment results of $10.6 million was due to the negative impact of Hurricane Beryl in 2024 resulting in additional costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($32.7 million), lower raw material costs ($26.5 million), primarily benzene and propylene, and increased volumes ($6.9 million), partially offset by higher operating costs ($30.7 million), including unabsorbed fixed manufacturing costs incurred from planned inventory reductions, and lower product pricing ($24.8 million). A significant percentage of our Euro denominated sales are from products manufactured within Europe. As a result, the impact of foreign currency translation on revenue is primarily offset by the impact of foreign currency translation on raw materials and manufacturing costs also denominated in Euros. Epoxy segment results included depreciation and amortization expense of $13.2 million and $13.7 million for the three months ended September 30, 2025 and 2024, respectively.

Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

Epoxy sales for the nine months ended September 30, 2025 were $1,012.5 million compared to $944.1 million for the same period in 2024, an increase of $68.4 million, or 7%. The sales increase was due to higher volumes ($107.7 million), including the impact of Hurricane Beryl in 2024, and a favorable effect of foreign currency translation ($3.9 million), partially offset by lower product pricing ($43.2 million).

Epoxy segment loss was $84.3 million for the nine months ended September 30, 2025 compared to segment loss of $57.6 million for the same period in 2024. The decrease in segment results of $26.7 million was due to higher operating costs ($72.5

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million), including unabsorbed fixed manufacturing costs incurred from planned inventory reductions and planned maintenance turnaround expenses, and lower product pricing ($43.2 million), partially offset by lower raw material costs ($49.8 million), primarily benzene and propylene, the negative impact of Hurricane Beryl in 2024 resulting in additional costs to restore operations, unabsorbed fixed manufacturing costs, and reduced profit from lost sales ($32.7 million) and increased volumes ($6.5 million). A significant percentage of our Euro denominated sales are from products manufactured within Europe. As a result, the impact of foreign currency translation on revenue is primarily offset by the impact of foreign currency translation on raw materials and manufacturing costs also denominated in Euros. Epoxy segment results included depreciation and amortization expense of $39.1 million and $40.6 million for the nine months ended September 30, 2025 and 2024, respectively.

Winchester

Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

Winchester sales were $439.6 million for the three months ended September 30, 2025 compared to $432.8 million for the same period in 2024, an increase of $6.8 million, or 2%. The sales increase was due to higher sales to military customers and military project revenue ($34.5 million), partially offset by lower sales to commercial customers ($25.6 million) and law enforcement agencies ($2.1 million).

Winchester segment income was $19.3 million for the three months ended September 30, 2025 compared to $53.4 million for the same period in 2024, a decrease of $34.1 million. The decrease in segment results was due to lower product pricing ($13.5 million), higher raw material and operating costs ($13.1 million), including commodity metal and propellant costs, and an unfavorable sales mix ($7.5 million). Winchester segment income included depreciation and amortization expense of $7.8 million and $8.5 million for the three months ended September 30, 2025 and 2024, respectively.

Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

Winchester sales were $1,275.2 million for the nine months ended September 30, 2025 compared to $1,248.2 million for the same period in 2024, an increase of $27.0 million, or 2%. The sales increase was due to higher sales to military customers and military project revenue ($200.3 million), partially offset by lower sales to commercial customers ($164.8 million) and law enforcement agencies ($8.5 million).

Winchester segment income was $67.1 million for the nine months ended September 30, 2025 compared to $195.9 million for the same period in 2024, a decrease of $128.8 million. The decrease in segment results was due to an unfavorable sales mix ($51.1 million), higher raw material and operating costs ($43.0 million), including commodity metal and propellant costs, and lower product pricing ($34.7 million). Winchester segment income included depreciation and amortization expense of $25.2 million and $24.7 million for the nine months ended September 30, 2025 and 2024, respectively.

Corporate/Other

Three Months Ended September 30, 2025 Compared to Three Months Ended September 30, 2024

For the three months ended September 30, 2025, charges to income for environmental investigatory and remedial activities were $4.5 million compared to $7.2 million for the three months ended September 30, 2024. These charges related primarily to expected future investigatory and remedial activities associated with past manufacturing operations and former waste disposal sites. For the three months ended September 30, 2025, environmental expense included $1.0 million of insurance recoveries for environmental costs incurred and expensed in prior periods.

For the three months ended September 30, 2025 and 2024, other corporate and unallocated costs were $25.9 million. Higher variable incentive compensation costs ($5.0 million), which includes mark-to-market adjustments on stock-based compensation expense, and higher depreciation and amortization expense ($2.3 million), were offset primarily by a favorable foreign currency impact ($7.0 million).

Nine Months Ended September 30, 2025 Compared to Nine Months Ended September 30, 2024

For the nine months ended September 30, 2025, charges to income for environmental investigatory and remedial activities were $14.3 million compared to $19.4 million for the nine months ended September 30, 2024. These charges related primarily to expected future investigatory and remedial activities associated with past manufacturing operations and former waste disposal sites. For the nine months ended September 30, 2025, environmental expense included $1.0 million of insurance recoveries for environmental costs incurred and expensed in prior periods.

For the nine months ended September 30, 2025, other corporate and unallocated costs were $65.8 million compared to $68.7 million for the nine months ended September 30, 2024, a decrease of $2.9 million. The decrease was primarily due to a favorable foreign currency impact ($16.7 million), partially offset by higher variable incentive compensation costs ($9.4

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million), which includes mark-to-market adjustments on stock-based compensation expense, and higher depreciation and amortization expense ($4.6 million).

Restructurings

Pretax restructuring charges related to our restructuring and optimization efforts include facility exit costs, lease and other contract termination costs, employee severance and related benefits costs and the write-off of equipment and facilities. Pretax restructuring charges for the three and nine months ended September 30, 2025 and 2024, were as follows:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Restructuring Charges			($ in millions, except per share data)
Restructuring charges			$	2.9					$	7.9					$	14.3					$	23.0

Further discussion on our restructuring optimization efforts is referenced under Item 1, within Note 4, “Restructuring Charges.”

OUTLOOK

The fourth quarter market environment, typically the weakest seasonal quarter for our businesses, is anticipated to be more difficult than usual, as continued global uncertainty and related cautious customer buying patterns will further challenge demand. As a result, we expect our Chemicals businesses’ fourth quarter 2025 results to decline from the third quarter 2025. We expect our Winchester business fourth quarter results to decline from third quarter 2025 levels as a result of seasonally weaker commercial ammunition demand and inventory destocking by our retail customers. Overall, we expect Olin’s fourth quarter 2025 operating results to be lower than our third quarter 2025 levels.

Other corporate and unallocated costs in 2025 are expected to be comparable with the $90.1 million in 2024.

During 2025, we anticipate environmental expenses in the $25 million to $30 million range, compared to $30.2 million in 2024.

We expect non-operating pension income in 2025 to be lower than the $26.0 million in 2024. Based on our plan assumptions and estimates, we will not be required to make any cash contributions to our domestic qualified defined benefit pension plan in 2025. We have several international qualified defined benefit pension plans for which we anticipate cash contributions of less than $5 million in 2025.

In 2025, we currently expect our capital spending to be in the $200 million to $220 million range and we expect to make a payment under other long-term supply contracts of $31 million. We expect 2025 depreciation and amortization expense to be approximately $525 million.

We currently believe 2025 income tax will be a benefit of $25 million to $35 million. We expect cash taxes paid to be approximately $175 million, primarily for earnings in foreign jurisdictions, including the previously deferred international tax payments that have been made in 2025.

ENVIRONMENTAL MATTERS

Environmental provisions charged to income, which are included in costs of goods sold, were as follows:

			Three Months Ended September 30,												Nine Months Ended September 30,
			2025						2024						2025						2024
Environmental Expense			($ in millions)
Provisions charged to income			$	5.5					$	7.2					$	15.3					$	19.4
Insurance recoveries(1)			(1.0)						—						(1.0)						—
Environmental expense			$	4.5					$	7.2					$	14.3					$	19.4

(1) Insurance recoveries for costs incurred and expensed in prior periods.

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The following table summarizes the environmental liability activity:

			Nine Months Ended September 30,
			2025						2024
Environmental Liabilities			($ in millions)
Balance at beginning of year			$	156.5					$	153.6
Charges to income			15.3						19.4
Remedial and investigatory spending			(17.1)						(18.8)
Balance at end of period			$	154.7					$	154.2

Environmental investigatory and remediation activities spending was associated with former waste disposal sites and past manufacturing operations. Spending in 2025 for investigatory and remedial efforts, the timing of which is subject to regulatory approvals and other uncertainties, is estimated to be approximately $30 million. Cash outlays for remedial and investigatory activities associated with former waste disposal sites and past manufacturing operations were not charged to income, but instead, were charged to reserves established for such costs identified and expensed to income in prior periods. Associated costs of investigatory and remedial activities are provided for in accordance with generally accepted accounting principles governing probability and the ability to reasonably estimate future costs. Our ability to estimate future costs depends on whether our investigatory and remedial activities are in preliminary or advanced stages. With respect to unasserted claims, we accrue liabilities for costs that, in our experience, we expect to incur to protect our interests against those unasserted claims. Our accrued liabilities for unasserted claims amounted to $11.3 million at September 30, 2025. With respect to asserted claims, we accrue liabilities based on remedial investigation, feasibility study, remedial action and operation, maintenance and monitoring (OM&M) expenses that, in our experience, we expect to incur in connection with the asserted claims. Required site OM&M expenses are estimated and accrued in their entirety for required periods not exceeding 30 years, which reasonably approximates the typical duration of long-term site OM&M. Charges to income for investigatory and remedial efforts may be material to our operating results in 2025.

The condensed balance sheets included reserves for future environmental expenditures to investigate and remediate known sites amounting to $154.7 million, $156.5 million and $154.2 million at September 30, 2025, December 31, 2024 and September 30, 2024, respectively, of which $124.7 million, $126.5 million and $122.2 million, respectively, were classified as other noncurrent liabilities. These amounts do not take into account any discounting of future expenditures or any consideration of insurance recoveries or advances in technology. These liabilities are reassessed periodically to determine if environmental circumstances have changed and/or remediation efforts and our estimate of related costs have changed. As a result of these reassessments, future charges to income may be made for additional liabilities.

Environmental exposures are difficult to assess for numerous reasons, including the identification of new sites, developments at sites resulting from investigatory studies, advances in technology, changes in environmental laws and regulations and their application, changes in regulatory authorities, the scarcity of reliable data pertaining to identified sites, the difficulty in assessing the involvement and financial capability of other Potentially Responsible Parties (PRPs), our ability to obtain contributions from other parties and the lengthy time periods over which site remediation occurs. It is possible that some of these matters (the outcomes of which are subject to various uncertainties) may be resolved unfavorably to us, which could materially adversely affect our financial position or results of operations.

LEGAL MATTERS AND CONTINGENCIES

Discussion of legal matters and contingencies can be referred to under Item 1, within Note 18, “Commitments and Contingencies.”

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LIQUIDITY AND CAPITAL RESOURCES

Cash Flow Data

			Nine Months Ended September 30,
			2025						2024
Cash Provided by (Used for)			($ in millions)
Net operating activities			$	153.0					$	361.5
Capital expenditures			(163.5)						(144.1)
Business acquired in purchase transaction, net of cash acquired			(55.8)						—
Payments under other long-term supply contracts			—						(58.6)
Net investing activities			(225.6)						(207.0)
Long-term debt borrowings, net			155.8						216.7
Common stock repurchased and retired			(40.4)						(256.8)
Stock options exercised			2.1						22.6
Dividends paid			(68.8)						(70.9)
Net financing activities			36.7						(98.9)

Operating Activities

For the nine months ended September 30, 2025, cash provided by operating activities decreased by $208.5 million from the nine months ended September 30, 2024, primarily due to a larger increase in working capital compared with the prior year period and lower operating results. For the nine months ended September 30, 2025, working capital increased $264.9 million compared to an increase of $58.7 million for the nine months ended September 30, 2024. Receivables increased $33.1 million, primarily due to higher sales during the third quarter 2025 compared to the fourth quarter 2024. Inventories increased by $100.1 million and accounts payable and accrued liabilities increased $71.7 million from December 31, 2024. Income taxes payable, net of income taxes receivable, decreased by $196.0 million from December 31, 2024, primarily due to timing of international tax payments and Inflation Reduction Act tax credits recognized in the third quarter 2025.

Investing Activities

Capital spending was $163.5 million for the nine months ended September 30, 2025, compared to $144.1 million for the comparable period in 2024. For the full year 2025, we expect our capital spending to be in the $200 million to $220 million range. Our capital spending forecast represents normal capital spending to maintain our current operating facilities. We expect 2025 depreciation and amortization expense to be in the $525 million range.

On April 18, 2025, Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for total consideration of $55.8 million. The acquisition was financed with cash on hand.

For the nine months ended September 30, 2024, payments under other long-term supply contracts were $58.6 million for energy modernization on the U.S. Gulf Coast. Our payments for this project were completed in the third quarter of 2024.

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Financing Activities

During the nine months ended September 30, 2025 and 2024, activity of our outstanding debt included:

						Nine Months Ended September 30,
						2025						2024
Long-term Debt Borrowings (Repayments)						($ in millions)
Borrowings
Term Loan Facilities						$	650.0					$	—
Revolving Credit Facilities						610.0						490.0
Receivables Financing Agreements						625.0						97.4
2033 Notes						600.0						—
Total borrowings						2,485.0						587.4
Repayments
Go zone bonds, due 2024						—						(50.0)
Recovery zone bonds, due 2024						—						(20.0)
Term Loan Facilities						(340.6)						(6.6)
Revolving Credit Facilities						(750.0)						(208.0)
Receivables Financing Agreements						(630.0)						(86.1)
2025 Notes						(108.6)						—
2027 Notes						(500.0)						—
Total repayments						(2,329.2)						(370.7)
Long-term debt borrowings, net						$	155.8					$	216.7

For the nine months ended September 30, 2025, we paid debt issuance costs of $12.0 million associated with the 2033 Notes and the 2025 Senior Credit Facility.

For the nine months ended September 30, 2025 and 2024, 1.7 million and 4.9 million shares, respectively, of common stock were repurchased and retired at a total value of $40.4 million and $256.8 million, respectively.

We issued less than 0.1 million and 0.9 million shares representing stock options exercised for the nine months ended September 30, 2025 and 2024, respectively, with a total value of $2.1 million and $22.6 million, respectively. For the nine months ended September 30, 2024, we withheld and paid $10.5 million for employee taxes on share-based payment arrangements.

The percentage of total debt to total capitalization increased to 60.0% as of September 30, 2025 from 58.0% as of December 31, 2024, primarily as a result of a higher level of debt outstanding.

In each of the first three quarters of 2025 and 2024, we paid a quarterly dividend of $0.20 per share. Dividends paid for the nine months ended September 30, 2025 and 2024, were $68.8 million and $70.9 million, respectively.

Liquidity and Other Financing Arrangements

Our principal sources of liquidity are from cash and cash equivalents, cash flow from operations and borrowings under our 2025 Revolving Credit Facility and our 2024 Receivables Financing Agreement (as defined below). Additionally, we believe that we have access to the high-yield debt and equity markets.

On March 14, 2025, Olin issued $600.0 million aggregate principal amount of 6.625% senior notes due April 1, 2033 (2033 Notes), in a private offering exempt from the registration requirements of the Securities Act of 1933, as amended. Interest on the 2033 Notes began accruing from March 14, 2025 and is paid semi-annually beginning on October 1, 2025, and every six months thereafter.

On March 14, 2025, Olin entered into a $1,850.0 million senior credit facility (2025 Senior Credit Facility), which increased the borrowing limit of our then-existing $1,550.0 million senior credit facility (2022 Senior Credit Facility) by $300.0 million and extended the maturity date from October 11, 2027 to March 14, 2030. The 2025 Senior Credit Facility includes a

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term loan facility with aggregate commitments of $650.0 million (2025 Term Loan Facility) and a revolving credit facility with aggregate commitments of $1,200.0 million (2025 Revolving Credit Facility).

The 2025 Term Loan Facility replaced Olin’s then-existing $350.0 million term loan facility (2022 Term Loan Facility, and collectively with the new 2025 Term Loan Facility, the Term Loan Facilities). The 2025 Term Loan Facility requires principal amortization payments beginning on June 30, 2025 at a rate of 0.625% per quarter through March 31, 2027, increasing to 1.250% per quarter thereafter, until maturity, and was fully drawn on the closing date.

The 2025 Revolving Credit Facility replaced Olin’s then-existing $1,200.0 million revolving credit facility (2022 Revolving Credit Facility, and collectively with the new 2025 Revolving Credit Facility, the Revolving Credit Facilities). The 2025 Revolving Credit Facility includes a $100.0 million letter of credit subfacility. At September 30, 2025, we had $1,169.6 million available under our 2025 Revolving Credit Facility because we had $30.0 million borrowed under the facility and issued $0.4 million of letters of credit.

Proceeds from the 2033 Notes, together with borrowings under the 2025 Senior Credit Facility, were used to redeem the $108.6 million 2025 Notes, redeem the $500.0 million 2027 Notes, refinance the then-existing 2022 Senior Credit Facility, comprised of $505.0 million of borrowings under the 2022 Revolving Credit Facility and $332.5 million of borrowings under the 2022 Term Loan Facility, and pay related fees and expenses.

We were in compliance with all covenants and restrictions under all our outstanding debt agreements as of September 30, 2025, and no event of default had occurred under any of our outstanding debt agreements that would permit the acceleration of the debt if not cured. In the future, our ability to generate sufficient operating cash flows, among other factors, will determine the amounts available to be borrowed under these facilities. As a result of our restrictive covenant related to the net leverage ratio, the maximum additional borrowings available to us could be limited in the future. The limitation, if an amendment or waiver from our lenders is not obtained, could restrict our ability to borrow the maximum amounts available under the 2025 Senior Credit Facility and the 2024 Receivables Financing Agreement (defined below). As of September 30, 2025, there were no covenants or other restrictions that limited our ability to borrow.

On November 20, 2024, we entered into a $500.0 million receivables financing agreement (2024 Receivables Financing Agreement), which increased the borrowing limit of our then-existing $425.0 million receivables financing agreement (2022 Receivables Financing Agreement) by $75.0 million and extended the maturity date from October 14, 2025 to November 19, 2027 (collectively, the Receivables Financing Agreements).

Under the Receivables Financing Agreements, our eligible trade receivables are used for collateralized borrowings and continue to be serviced by us. In addition, the Receivables Financing Agreements incorporate the net leverage ratio covenant that is contained in the 2025 Senior Credit Facility. As of September 30, 2025, December 31, 2024 and September 30, 2024, we had $470.0 million, $475.0 million and $339.8 million, respectively, drawn under the Receivables Financing Agreements. As of September 30, 2025, $617.0 million of our trade receivables were pledged as collateral and we had $28.0 million of additional borrowing capacity under the 2024 Receivables Financing Agreement, which was limited by our borrowing base.

At September 30, 2025, we had total letters of credit of $161.4 million outstanding, of which $0.4 million were issued under our 2025 Revolving Credit Facility. The letters of credit were used to support certain long-term debt obligations, workers compensation insurance policies, plant closure and post-closure obligations, international payment obligations and international pension funding requirements.

Our current debt structure is used to fund our business operations. As of September 30, 2025, we had long-term borrowings, including the current installment, of $2,993.4 million, of which $1,227.8 million were at variable rates. Included within long-term borrowings on the condensed balance sheets were deferred debt issuance costs of $19.0 million as of September 30, 2025.

We believe, based on current and projected levels of cash flow from our operations, together with our cash and cash equivalents on hand and the availability to borrow under our 2025 Revolving Credit Facility and 2024 Receivables Financing Agreement, we have the ability to access sufficient liquidity to meet our short-term and long-term needs, to make required payments of interest on our debt, fund our operating needs, working capital and our capital expenditure requirements, and comply with the financial ratios and other covenants and restrictions in our debt agreements.

On December 11, 2024, our Board of Directors approved a share repurchase program with a $1.3 billion authorization (2024 Repurchase Authorization). The Board of Directors previously authorized share repurchases with a $2.0 billion authorization on July 28, 2022 (2022 Repurchase Authorization). The 2024 Repurchase Authorization and 2022 Repurchase Authorization will terminate upon the purchase of $1.3 billion and $2.0 billion of common stock, respectively.

For the nine months ended September 30, 2025, 1.7 million shares of common stock were repurchased and retired at a total value of $40.4 million. As of September 30, 2025, a cumulative total of 26.8 million shares of common stock have been

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repurchased and retired at a total value of $1,341.1 million under the 2022 Repurchase Authorization program, and $1,958.9 million of common stock remained authorized to be repurchased under the 2022 Repurchase Authorization and 2024 Repurchase Authorization programs.

We have registered the sale of an undetermined number of securities with the SEC, so that, from time-to-time, we may issue, offer and sell debt securities, preferred stock, common stock and/or warrants to purchase any such securities pursuant to a registration statement.

Credit Ratings

We receive ratings from three independent credit rating agencies: Fitch Ratings (Fitch), Moody's Investor Service (Moody's) and Standard & Poor's (S&P). The following table summarizes our credit ratings as of September 30, 2025:

Credit Rating Agency

Long-term Rating

Outlook

Fitch Ratings

BBB-

Stable

Moody’s Investors Service

Ba1

Stable

Standard & Poor’s

BB+

Stable

On June 3, 2025, Moody’s affirmed Olin’s Ba1 rating and stable outlook. On March 12, 2025, Fitch affirmed Olin’s BBB- rating and stable outlook. On August 8, 2024, S&P affirmed Olin’s BB+ rating and revised its outlook from positive to stable.

Contractual Obligations

Purchasing commitments are utilized in our normal course of business for our projected needs. We have supply contracts with various third parties for certain raw materials including ethylene, electricity, propylene and benzene. These agreements are maintained through long-term cost-based contracts that provide us with a reliable supply of key raw materials. There have been no material changes in our contractual obligations and commitments as disclosed in our Annual Report on Form 10-K for the year ended December 31, 2024, other than those which occur in the ordinary course of business.

Critical Accounting Estimates

Refer to “Critical Accounting Estimates” contained in Part II, Item 7 of our Annual Report on Form 10-K for the year ended December 31, 2024 for a complete discussion of our critical accounting estimates. There have been no material changes to our critical accounting estimates since our Annual Report on Form 10-K for the year ended December 31, 2024.

New Accounting Pronouncements

Discussion of new accounting pronouncements can be referred to under Item 1, within Note 2, “Recent Accounting Pronouncements.”

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to market risk in the normal course of our business operations due to our purchases of certain commodities, our ongoing investing and financing activities and our operations that use foreign currencies. The risk of loss can be assessed from the perspective of adverse changes in fair values, cash flows and future earnings. We have established policies and procedures governing our management of market risks and the use of financial instruments to manage exposure to such risks.

Energy costs, including electricity and natural gas, and certain raw materials used in our production processes are subject to price volatility. Depending on market conditions, we may enter into futures contracts, forward contracts, commodity swaps and put and call option contracts in order to reduce the impact of commodity price fluctuations. As of September 30, 2025, we maintained open positions on commodity contracts with a notional value totaling $234.2 million ($204.5 million at December 31, 2024, and $207.2 million at September 30, 2024). Assuming a hypothetical 10% increase in commodity prices which are currently hedged, as of September 30, 2025, we would experience a $23.4 million ($20.5 million at December 31, 2024 and $20.7 million at September 30, 2024) increase in our cost of inventory purchased, which would be substantially offset by a corresponding increase in the value of related hedging instruments.

We transact business in various foreign currencies other than the USD which exposes us to movements in exchange rates which may impact revenue and expenses, assets and liabilities and cash flows. Our significant foreign currency exposure is denominated with European currencies, primarily the Euro, although exposures also exist in other currencies of Asia Pacific, Latin America, Middle East and Africa. For all derivative positions, we evaluated the effects of a 10% shift in exchange rates between those currencies and the USD, holding all other assumptions constant. Unfavorable currency movements of 10%

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would negatively affect the fair values of the derivatives held to hedge currency exposures by $14.1 million. These unfavorable changes would generally have been offset by favorable changes in the values of the underlying exposures.

We are exposed to changes in interest rates primarily as a result of our investing and financing activities. Our current debt structure is used to fund business operations, and commitments from banks under our 2025 Revolving Credit Facility and our 2024 Receivables Financing Agreement are additional sources of liquidity. As of September 30, 2025, December 31, 2024 and September 30, 2024, we had long-term borrowings, including current installments, of $2,993.4 million, $2,842.2 million and $2,889.5 million, respectively, of which $1,227.8 million, $1,063.4 million and $1,110.4 million at September 30, 2025, December 31, 2024 and September 30, 2024, respectively, were issued at variable rates. Included within long-term borrowings on the condensed balance sheets were deferred debt issuance costs and unamortized bond original issue discount.

Assuming no changes in the $1,227.8 million of variable-rate debt levels from September 30, 2025, we estimate that a hypothetical change of 100-basis points in the secured overnight financing rate (SOFR) would impact annual interest expense by $12.3 million.

If the actual changes in commodities, foreign currency, or interest pricing is substantially different than expected, the net impact of commodity risk, foreign currency risk, or interest rate risk on our cash flow may be materially different than that disclosed above.

We do not enter into any derivative financial instruments for speculative purposes.

ITEM 4. CONTROLS AND PROCEDURES

Our Chief Executive Officer and our Chief Financial Officer evaluated the effectiveness of our disclosure controls and procedures as of September 30, 2025. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of such date, our disclosure controls and procedures were effective to ensure that information Olin is required to disclose in the reports that it files or submits with the SEC under the Securities Exchange Act of 1934 is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and to ensure that information we are required to disclose in such reports is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

There have been no changes in our internal control over financial reporting that occurred during the quarter ended September 30, 2025, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This quarterly report on Form 10-Q includes forward-looking statements. These statements relate to analyses and other information that are based on management’s beliefs, certain assumptions made by management, forecasts of future results, and current expectations, estimates and projections about the markets and economy in which we and our various segments operate. The statements contained in this quarterly report on Form 10-Q that are not statements of historical fact may include forward-looking statements that involve a number of risks and uncertainties.

We have used the words “anticipate,” “intend,” “may,” “expect,” “believe,” “should,” “plan,” “outlook,” “project,” “estimate,” “forecast,” “optimistic,” “target,” and variations of such words and similar expressions in this quarterly report to identify such forward-looking statements. These statements are not guarantees of future performance and involve certain risks, uncertainties and assumptions, which are difficult to predict and many of which are beyond our control. Therefore, actual outcomes and results may differ materially from those matters expressed or implied in such forward-looking statements. We undertake no obligation to update publicly any forward-looking statements, whether as a result of future events, new information or otherwise. The payment of cash dividends is subject to the discretion of our Board of Directors and will be determined in light of then-current conditions, including our earnings, our operations, our financial conditions, our capital requirements and other factors deemed relevant by our Board of Directors. In the future, our Board of Directors may change our dividend policy, including the frequency or amount of any dividend, in light of then-existing conditions.

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The risks, uncertainties and assumptions involved in our forward-looking statements, many of which are discussed in more detail in our filings with the SEC, including without limitation the “Risk Factors” section of our Annual Report on Form 10-K for the year ended December 31, 2024, and our Quarterly Reports on Form 10-Q and other reports furnished or filed with the SEC, include, but are not limited to, the following:

Business, Industry and Operational Risks

•sensitivity to economic, business and market conditions in the United States and overseas, including economic instability or a downturn in the sectors served by us;

•declines in average selling prices for our products and the supply/demand balance for our products, including the impact of excess industry capacity or an imbalance in demand for our chlor alkali products;

•unsuccessful execution of our operating model, which prioritizes Electrochemical Unit (ECU) margins over sales volumes;

•failure to control costs and inflation impacts or failure to achieve targeted cost reductions;

•our reliance on a limited number of suppliers for specified feedstock and services and our reliance on third-party transportation;

•availability of and/or higher-than-expected costs of raw material, energy, transportation, and/or logistics;

•the occurrence of unexpected manufacturing interruptions and outages, including those occurring as a result of labor disruptions and production hazards;

•exposure to physical risks associated with climate-related events or increased severity and frequency of severe weather events;

•the failure or an interruption, including cyber-attacks, of our information technology systems;

•risks associated with our international sales and operations, including economic, political or regulatory changes;

•failure to identify, attract, develop, retain and motivate qualified employees throughout the organization and ability to manage executive officer and other key senior management transitions;

•our inability to complete future acquisitions or joint venture transactions or successfully integrate them into our business;

•adverse conditions in the credit and capital markets, limiting or preventing our ability to borrow or raise capital;

•weak industry conditions affecting our ability to comply with the financial maintenance covenants in our senior credit facility;

•our indebtedness and debt service obligations;

•the effects of any declines in global equity markets on asset values and any declines in interest rates or other significant assumptions used to value the liabilities in, and funding of, our pension plans;

•our long-range plan assumptions not being realized causing a non-cash impairment charge of long-lived assets;

Legal, Environmental and Regulatory Risks

•changes in, or failure to comply with, legislation or government regulations or policies, including changes regarding our ability to manufacture or use certain products and changes within the international markets in which we operate;

•new regulations or public policy changes regarding the transportation of hazardous chemicals and the security of chemical manufacturing facilities;

•unexpected outcomes from legal or regulatory claims and proceedings;

•costs and other expenditures in excess of those projected for environmental investigation and remediation or other legal proceedings;

•various risks associated with our Lake City U.S. Army Ammunition Plant contract and performance under other governmental contracts; and

•failure to effectively manage environmental, social and governance issues and related regulations, including climate change and sustainability.

All of our forward-looking statements should be considered in light of these factors. In addition, other risks and uncertainties not presently known to us or that we consider immaterial could affect the accuracy of our forward-looking statements.

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PART II — OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Discussion of legal matters and contingencies can be referred to under Item 1, within Note 18, “Commitments and Contingencies.”

ITEM 1A. RISK FACTORS

Information regarding risk factors applicable to us appears in Part I, Item 1A. Risk Factors of our Annual Report on Form 10-K for the year ended December 31, 2024. There have been no material changes to the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2024.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a)    Not Applicable.

(b)    Not Applicable.

(c)    Issuer Purchases of Equity Securities

Period						Total Number of Shares (or Units) Purchased(1)						Average Price Paid per Share (or Unit)(2)						Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs						Maximum Dollar Value of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
July 1-31, 2025						100,000						$	18.93					100,000
August 1-31, 2025						433,735						$	18.69					433,735
September 1-30, 2025						—						$	—					—
Total																								$	1,958,907,308		(1)

(1)On December 11, 2024, our Board of Directors authorized a share repurchase program for the purchase of shares of common stock at an aggregate price of up to $1.3 billion (the 2024 Repurchase Authorization). This program will terminate upon the purchase of $1.3 billion of common stock. On July 28, 2022, our Board of Directors authorized a share repurchase program for the purchase of shares of common stock at an aggregate price of up to $2.0 billion (2022 Repurchase Authorization). This program will terminate upon the purchase of $2.0 billion of common stock. Through September 30, 2025, 26.8 million shares of common stock had been repurchased and retired at a total value of $1,341.1 million under the 2022 Repurchase Authorization program, and $1,958.9 million of common stock remained available for purchase under the 2022 Repurchase Authorization and 2024 Repurchase Authorization programs.

(2)Average price paid per share includes transaction costs including commissions and fees paid to acquire the shares and excludes costs accrued associated with 1% excise tax on the fair market value of stock repurchases.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not Applicable.

ITEM 5. OTHER INFORMATION

(a)    Not Applicable.

(b)    Not Applicable.

(c)    During the three months ended September 30, 2025, no director or officer of Olin adopted, terminated or modified a ‘Rule 10b5-1 trading arrangement’ or ‘non-Rule 10b5-1 trading arrangement,’ as each term is defined in Item 408(a) of Regulation S-K.

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ITEM 6. EXHIBITS

Exhibit						Exhibit Description
3.1						Bylaws of Olin Corporation, as amended effective August 13, 2025 – Exhibit 3.1 to Olin’s Form 8-K filed August 13, 2025*
31.1						Section 302 Certification Statement of Chief Executive Officer
31.2						Section 302 Certification Statement of Chief Financial Officer
32						Section 906 Certification Statement of Chief Executive Officer and Chief Financial Officer
101.INS						Inline XBRL Instance Document (the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the XBRL document)
101.SCH						Inline XBRL Taxonomy Extension Schema Document
101.CAL						Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF						Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB						Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE						Inline XBRL Taxonomy Extension Presentation Linkbase Document
104						Cover Page Interactive Data File (formatted as Inline XBRL and embedded in the Exhibit 101 Interactive Data Files)

* Previously filed as indicated and incorporated herein by reference. Exhibits incorporated by reference are located in SEC file No. 1-1070 unless otherwise indicated.

† Indicated management contract or compensatory arrangement.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			OLIN CORPORATION
			(Registrant)
			By:			/s/ Todd A. Slater
						Senior Vice President and Chief Financial Officer (Authorized Officer)

Date: October 28, 2025

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FAQ

What were Olin (OLN) Q3 2025 results?

Sales were $1,713.2 million and net income attributable to Olin was $42.8 million, with diluted EPS of $0.37.

How did Olin’s segments perform in Q3 2025?

Chlor Alkali sales were $924.0M; Epoxy sales $349.6M with negative gross margin; Winchester sales $439.6M.

What tax credits affected Olin’s Q3 2025 margins?

Olin recorded a $32.0 million reduction to cost of goods sold tied to the Section 45V clean hydrogen production tax credit.

What changed in Olin’s debt structure in 2025?

Issued $600.0M 6.625% notes due 2033 and entered a $1,850.0M senior credit facility maturing 2030, redeeming 2025/2027 notes and refinancing prior facilities.

How much cash and debt did Olin report at September 30, 2025?

Cash and cash equivalents were $140.3 million; total debt was $2,993.4 million.

Did Olin repurchase shares year-to-date?

Yes. Olin repurchased and retired 1.7 million shares for $40.4 million in the nine months ended September 30, 2025.

What acquisition did Olin complete in 2025?

Olin acquired AMMO, Inc.’s small caliber ammunition manufacturing assets for $55.8 million, included in the Winchester segment.