[Form 4] Olin Corp. Insider Trading Activity

Rhea-AI Filing Summary

Teresa M. Vermillion, VP & Treasurer of Olin Corporation (OLN), reported option exercise and share sale on 08/13/2025. She exercised employee stock options to acquire 6,000 shares at an exercise price of $13.14 per share and simultaneously sold 6,000 shares at a weighted-average price of $21.107 per share. After these transactions the filing reports Ms. Vermillion holds 17,199 shares directly and additionally holds shares indirectly under the company retirement plan as reported by the plan administrator.

The filing notes that 427.769 shares held under dividend reinvestment plans are included in reported amounts and that the retirement savings plan shares reflect tax‑conditioned holdings exempt under Rule 16b‑3. The form is signed by an attorney‑in‑fact and dated 08/15/2025.

Insights

Securities Analyst

TL;DR: Routine insider option exercise paired with a contemporaneous sale; results in no net new liquid position, routine disclosure.

The reported transactions show an employee stock option exercise and an immediate sale of an equal number of shares. The exercise price of $13.14 versus the weighted average sale price of $21.107 indicates the officer realized value from option exercise and sale. Holdings reported after the transactions (17,199 direct shares plus retirement plan and DRIP amounts disclosed) remain modest relative to a typical public company float, and there is no indication of a change in control or material shift in ownership. This is a standard Section 16 disclosure documenting insider compensation and liquidity events rather than a company‑level operational development.

Corporate Governance Expert

TL;DR: Compliance filing documents exempt and non‑exempt transactions; appears consistent with Rule 10b5‑1/Rule 16 reporting practices.

The Form 4 clearly separates exempt plan holdings (dividend reinvestment and retirement savings plan) from reportable option exercise and open‑market sales. The reporting person is identified as an officer and the form is filed individually. Footnotes supply required details about DRIP and RSP holdings and the weighted‑average sale price. From a governance and disclosure perspective, the form meets Section 16 requirements by reporting acquisition, disposition, and beneficial ownership metrics; there are no apparent reporting anomalies or missing mandatory disclosures in the provided text.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

VERMILLION TERESA M

(Last) (First) (Middle)

C/O OLIN CORPORATION

190 CARONDELET PLZ, STE 1530

(Street)

CLAYTON MO 63105

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
OLIN Corp [ OLN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP & Treasurer

3. Date of Earliest Transaction (Month/Day/Year)
08/13/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	08/13/2025		M		6,000	A	$13.14	23,199(1)	D
Common Stock	08/13/2025		S		6,000	D	$21.107(2)	17,199	D
Common Stock								140.7607(3)	I	By ESOP Trustee

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Options (Right to Buy)	$13.14	08/13/2025		M			6,000	02/12/2017	02/11/2026	Common Stock	6,000	$0	4,500	D

Explanation of Responses:

1. Amount includes 427.769 shares held under dividend reinvestment plans acquired periodically in transactions, which are exempt from Section 16(b).

2. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $21.07 to $21.135, inclusive. The reporting person undertakes to provide to Olin Corporation, any security holder of Olin Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote (2) to this Form 4.

3. The figure represents shares of Olin Common Stock held under the Olin Corporation Retirement Savings Plan, a tax conditioned plan reflecting transactions exempt under Rule 16b-3, as reported by the RSP Plan Administrator as of August 13, 2025.

Remarks:

	/s/ E.C. Tanner, Attorney-in-Fact	08/15/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.