Olin (OLN) VP & Treasurer exercises 4,500 options and sells shares

Rhea-AI Filing Summary

Olin Corporation vice president and treasurer reports stock option exercise and share sale. On 11/26/2025, the officer exercised employee stock options to acquire 4,500 shares of Olin common stock at an exercise price of $13.14 per share, then sold 4,500 shares on the same date at a weighted average price of $20.8556 per share. Following these transactions, the reporting person directly owned 17,199 shares of Olin common stock and had an additional 140.7607 shares held indirectly through the Olin Corporation Retirement Savings Plan as of November 26, 2025.

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)
11/26/2025

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	11/26/2025		M		4,500	A	$13.14	21,699	D
Common Stock	11/26/2025		S		4,500	D	$20.8556(1)	17,199	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
Employee Stock Options (Right to Buy)	$13.14	11/26/2025		M			4,500	02/12/2017	02/11/2026	Common Stock	4,500	$0	0	D

Explanation of Responses:

1. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.83 to $20.87, 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 (1) to this Form 4.

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 November 26, 2025.

Remarks:

	/s/ E.C. Tanner, Attorney-in-Fact	11/28/2025
	** 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.

FAQ

What insider transaction did Olin (OLN) report in this Form 4?

The filing shows that a vice president and treasurer of Olin Corporation exercised options for 4,500 shares of common stock and sold 4,500 shares on 11/26/2025.

What prices were involved in the Olin (OLN) insider’s Form 4 transactions?

The officer exercised employee stock options at $13.14 per share and sold 4,500 shares at a weighted average price of $20.8556 per share.

How many Olin (OLN) shares does the reporting person own after the Form 4 transactions?

After the reported transactions, the insider directly owned 17,199 Olin common shares and indirectly held 140.7607 shares through the Olin Corporation Retirement Savings Plan as of November 26, 2025.

What type of derivative security was exercised in this Olin (OLN) Form 4?

The derivative security was employee stock options (right to buy) for 4,500 shares of Olin common stock with an exercise price of $13.14 per share.

What was the date of the earliest transaction reported in this Olin (OLN) Form 4?

The earliest transaction date reported for the Olin insider was 11/26/2025.

What position does the reporting person hold at Olin (OLN)?

The reporting person is an officer of Olin Corporation, serving as VP & Treasurer.