OLIN Corp — Director's Dealing 2026

Feb 24, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OLIN Corp (OLN)
CIK: 0000074303
Period of Report: 2026-02-20

Reporting Person: Castle Angela M (VP & Chief Legal Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-20	Common Stock	M	3380	—	Acquired	4910	Direct
2026-02-20	Common Stock	F	1003	$24.09	Disposed	3907	Direct
2026-02-24	Common Stock	S	2379.2625	$24.2512	Disposed	1527.7375	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-20	Restricted Stock Units	$	M	3380	Disposed		Common Stock (3380)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	2.4123	Indirect

Footnotes

F1: Each restricted stock unit represents a contingent right to receive one share of Olin Common Stock.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.22 to $24.3415, 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 range set forth in footnote 2 to this Form 4.

F3: The figure represents shares of Olin Common Stock held under the Olin Corporation Retirement Savings Plan, a tax conditioned plan reflecting transactions exempt under Rule 16b-3, as reported by the RSP Plan Administrator as of February 20, 2026.

F4: On February 20, 2025 the reporting person was granted 10,138 restricted stock units, 3,380 shares vested on February 20, 2026, 3,379 shares vest on February 20, 2027 and 3,379 shares vest on February 20, 2028.