Angela M. Castle - 20 Feb 2026 Form 4 Insider Report for OLIN Corp (OLN)

Reporting relationship: VP & Chief Legal Officer
Issuer ticker: OLN
Reported as of: 20 Feb 2026
Net transaction value: -$81,862
SEC form: 4
Accepted by SEC: 24 Feb 2026, 17:26:36 UTC
Prior SEC filing: 20 Feb 2026
Source filing: View source filing
Reporting owner signature: /s/ E.C Tanner, Attorney-in-Fact

Key filing fact

Angela M. Castle filed Form 4 for OLIN Corp (OLN) on 24 Feb 2026.

Key facts

This page summarizes Angela M. Castle's Form 4 filing for OLIN Corp (OLN).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 24 Feb 2026, 17:26.

Change

Previous filing in this sequence was filed on 20 Feb 2026.
Current net transaction value: -$81,862.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002058796 Primary reporting owner

Castle Angela M

Relationship: VP & Chief Legal Officer
Address: 16290 KATY FREEWAY, 600, HOUSTON
Signature: /s/ E.C Tanner, Attorney-in-Fact
Signature date: 24 Feb 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

OLN transaction

Common Stock

Options Exercise

Transaction value
Shares: +3,380
Change %: +221%
Price
Shares after: 4,910
Date: 20 Feb 2026
Ownership: Direct
Footnotes: F1

OLN transaction

Common Stock

Tax liability

Transaction value: $24,162
Shares: -1,003
Change %: -20%
Price: $24.09
Shares after: 3,907
Date: 20 Feb 2026
Ownership: Direct

OLN transaction

Common Stock

Sale

Transaction value: $57,700
Shares: -2,379
Change %: -61%
Price: $24.25
Shares after: 1,528
Date: 24 Feb 2026
Ownership: Direct
Footnotes: F2

OLN holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 2
Date: 20 Feb 2026
Ownership: By RSP Trustee
Footnotes: F3

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

OLN transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -3,380
Change %: -33%
Price: $0.000000
Shares after: 6,758
Date: 20 Feb 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 3,380
Exercise price
Footnotes: F1, F4

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

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

Footnote 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.

Footnote 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.

Footnote 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.