OLIN Corp (OLN) VP & Treasurer receives 8,004 RSUs and stock award

Rhea-AI Filing Summary

OLIN Corp executive Teresa M. Vermillion, VP & Treasurer, reported equity awards on February 18, 2026. She acquired 8,004 restricted stock units at $0 per unit and a separate award of 79 shares of common stock, also at $0 per share, as part of compensation grants.

The restricted stock units convert into common stock on a one-to-one basis and vest in three annual installments beginning on February 18, 2027. After these awards, she directly held 8,004 restricted stock units and 17,278 shares of common stock, plus an additional 140.7607 shares of common stock 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

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)
02/18/2026

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	02/18/2026		A		79	A	$0	17,278	D
Common Stock								140.7607(1)	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	(2)	02/18/2026		A		8,004		(3)	(3)	Common Stock	8,004	$0	8,004	D

Explanation of Responses:

1. 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.

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

3. These restricted stock units vest in three annual installments beginning on February 18, 2027.

Remarks:

	/s/ E.C. Tanner, Attorney-in-Fact	02/20/2026
	** 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?

OLIN reported that VP & Treasurer Teresa M. Vermillion received equity awards on February 18, 2026. She acquired 8,004 restricted stock units and 79 shares of common stock at no cost as part of compensation, increasing both her derivative and non-derivative holdings in the company.

How many restricted stock units did the OLIN (OLN) executive receive?

Teresa M. Vermillion received 8,004 restricted stock units on February 18, 2026. These units were granted at a price of $0 per unit and convert into Olin common stock on a one-to-one basis, representing a significant component of her long-term equity-based compensation package.

When do Teresa Vermillion’s OLIN (OLN) restricted stock units vest?

The restricted stock units granted to Teresa Vermillion vest in three annual installments beginning on February 18, 2027. This means the award is spread over multiple years, encouraging longer-term alignment with Olin’s performance and tying a portion of her compensation to future company results.

What is Teresa Vermillion’s OLIN (OLN) direct common stock ownership after the Form 4?

Following the reported transactions, Teresa Vermillion directly held 17,278 shares of Olin common stock. This figure reflects the 79-share grant on February 18, 2026 added to her prior direct holdings, highlighting her personal equity stake alongside her role as VP & Treasurer.

How are OLIN (OLN) shares held under the Retirement Savings Plan reported?

The Form 4 shows 140.7607 Olin common shares held indirectly for Teresa Vermillion by the Retirement Savings Plan trustee. These are plan holdings in a tax-conditioned retirement program, with balances reported by the plan administrator as of February 20, 2026 under Rule 16b-3 exemptions.

Did Teresa Vermillion buy or sell OLIN (OLN) shares on the open market?

The reported transactions are equity awards classified as grants or other acquisitions at a price of $0, not open-market purchases or sales. Two acquisition transactions were reported, and there were no open-market buy or sell transactions disclosed in this Form 4 filing for February 18, 2026.