Olin (NYSE: OLN) VP & Treasurer exercises RSUs, withholds 674 shares for taxes

Rhea-AI Filing Summary

Olin Corporation VP & Treasurer Teresa M. Vermillion reported equity award activity on February 20, 2026. She exercised 2,318 restricted stock units, converting them into an equal number of common shares at $0.00 per share. To cover tax obligations, 674 common shares were disposed of at $24.09 per share through a tax-withholding transaction. Following these transactions, she directly held 18,922 common shares and 4,634 restricted stock units, plus an additional 140.7607 common shares held indirectly under 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

OMB APPROVAL

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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^*

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)
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		2,318	A	(1)	19,596	D
Common Stock	02/20/2026		F		674	D	$24.09	18,922	D
Common Stock								140.7607(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			2,318	(3)	(3)	Common Stock	2,318	$0	4,634	D

Explanation of Responses:

1. Restricted stock units convert into common stock on a one-on-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 6,952 restricted stock units, 2,318 shares vested on February 20, 2026, 2,317 shares vest on February 20, 2027 and 2,317 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).
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.

FAQ

What insider transactions did Olin (OLN) report for Teresa M. Vermillion?

Teresa M. Vermillion reported exercising 2,318 restricted stock units into common shares and a related tax-withholding disposition of 674 common shares at $24.09 per share on February 20, 2026. These transactions reflect routine equity award vesting and tax coverage.

How many Olin (OLN) restricted stock units did Vermillion exercise and what remains unvested?

Vermillion exercised 2,318 restricted stock units, converting them one-for-one into common stock. After this vesting, 4,634 restricted stock units remained credited in her account, scheduled to vest in two future annual installments according to the original February 20, 2025 grant terms.

How many Olin (OLN) common shares does Vermillion hold after these Form 4 transactions?

After the reported transactions, Vermillion directly held 18,922 Olin common shares. She also had 140.7607 additional common shares held indirectly through the Olin Corporation Retirement Savings Plan, giving her combined direct and indirect stock exposure alongside 4,634 remaining restricted stock units.

What was the purpose of the 674-share disposition reported for Olin (OLN)?

The 674-share disposition was a tax-withholding transaction to satisfy tax liabilities tied to the restricted stock unit vesting. Shares were delivered at $24.09 per share, a method commonly used so insiders cover tax obligations without making separate cash payments at vesting.

How are Vermillion’s indirect Olin (OLN) holdings structured under the Retirement Savings Plan?

Her indirect holdings consist of 140.7607 Olin common shares held by the Retirement Savings Plan trustee. These shares are part of the Olin Corporation Retirement Savings Plan and reflect plan-level transactions exempt under Rule 16b-3 as reported by the plan administrator on February 20, 2026.