Olin (NYSE: OLN) VP & Controller reports RSU vesting and tax share disposition

Rhea-AI Filing Summary

Olin Corp VP & Controller Nichole Sumner reported equity award activity involving restricted stock units and common shares. On February 20, 2026, 1,835 restricted stock units were exercised and converted into 1,835 shares of common stock, with no cash exercise price. To cover taxes on this vesting, 538 common shares were disposed of at $24.09 per share through a tax-withholding transaction. After these transactions, the reporting person directly held 26,147 common shares and 3,669 restricted stock units, plus 9,452.6705 common shares held indirectly through the Olin Corporation Retirement Savings Plan.

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

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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^*

Sumner R Nichole

(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 & Controller

3. Date of Earliest Transaction (Month/Day/Year)
02/20/2026

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	02/20/2026		M		1,835	A	(1)	26,685	D
Common Stock	02/20/2026		F		538	D	$24.09	26,147	D
Common Stock								9,452.6705(2)	I	By RSP 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
Restricted Stock Units	(1)	02/20/2026		M			1,835	(3)	(3)	Common Stock	1,835	$0	3,669	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-to-one basis.

2. The figure represents shares of Olin Common Stock held under the Olin Corporation Retirement Savings Plan (RSP), a tax conditioned plan reflecting transactions exempt under Rule 16b-3, as reported by the RSP Plan Administrator as of February 20, 2026.

3. On February 20, 2025 the reporting person was granted 5,504 restricted stock units, 1,835 shares vested on February 20, 2026, 1,835 shares vest on February 20, 2027 and 1,834 shares vest on February 20, 2028.

Remarks:

	/s/ E.C. Tanner, Attorney-in-Fact	02/24/2026
	** 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).
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FAQ

What did Olin (OLN) VP & Controller Nichole Sumner report on this Form 4?

Nichole Sumner reported equity award activity, including the exercise of 1,835 restricted stock units into common shares and a related tax-withholding share disposition. The filing updates her direct and indirect ownership positions in Olin common stock and restricted stock units.

How many Olin (OLN) restricted stock units did Nichole Sumner vest and convert?

She vested and converted 1,835 restricted stock units into 1,835 shares of Olin common stock on February 20, 2026. Footnotes state these units come from a 5,504-unit grant, with additional tranches scheduled to vest in February 2027 and February 2028.

What tax-related share disposition did the Olin (OLN) Form 4 disclose?

The Form 4 shows a tax-withholding disposition of 538 common shares at $24.09 per share. This transaction, coded “F,” represents payment of tax liability by delivering shares rather than an open-market sale, and adjusted Sumner’s direct share holdings.

What are Nichole Sumner’s direct Olin (OLN) holdings after these transactions?

Following the reported activity, Nichole Sumner directly held 26,147 shares of Olin common stock and 3,669 restricted stock units. These figures reflect the vesting-related conversion of units and the tax-withholding disposition reported for February 20, 2026.

What indirect Olin (OLN) holdings does the Form 4 show for Nichole Sumner?

The filing lists 9,452.6705 shares of Olin common stock held indirectly through the Olin Corporation Retirement Savings Plan. A footnote explains this is a tax-conditioned plan, with amounts based on data reported by the plan administrator as of February 20, 2026.

How do the restricted stock units in the Olin (OLN) Form 4 convert into common stock?

The footnotes state that restricted stock units convert into Olin common stock on a one-to-one basis. This means each vested restricted stock unit becomes one share of common stock when it is settled, as occurred with the 1,835 units on February 20, 2026.