Teresa M. Vermillion - Nov 26, 2025 Form 4 Insider Report for OLIN Corp (OLN)

Role: VP & Treasurer
Signature: /s/ E.C. Tanner, Attorney-in-Fact
Stock symbol: OLN
Transactions as of: Nov 26, 2025
Transactions value $: -$34,720
Form type: 4
Date filed: 11/28/2025, 10:05 AM
Previous filing: Aug 15, 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
VERMILLION TERESA M	VP & Treasurer	C/O OLIN CORPORATION, 190 CARONDELET PLZ, STE 1530, CLAYTON	/s/ E.C. Tanner, Attorney-in-Fact	2025-11-28	0001729998

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OLN	Common Stock	Options Exercise	$59.1K	+4.5K	+26.16%	$13.14	21.7K	Nov 26, 2025	Direct
transaction	OLN	Common Stock	Sale	-$93.9K	-4.5K	-20.74%	$20.86	17.2K	Nov 26, 2025	Direct	F1
holding	OLN	Common Stock						141	Nov 26, 2025	By RSP Trustee	F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	OLN	Employee Stock Options (Right to Buy)	Options Exercise	$0	-4.5K	-100%	$0.00	0	Nov 26, 2025	Common Stock	4.5K	$13.14	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	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.
F2	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.

Content

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.

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.