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

Role
VP & Chief Legal Officer
Signature
/s/ E.C Tanner, Attorney-in-Fact
Issuer symbol
OLN
Transactions as of
20 Feb 2026
Net transactions value
-$81,862
Form type
4
Filing time
24 Feb 2026, 17:26:36 UTC
Previous filing
20 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Castle Angela M VP & Chief Legal Officer 16290 KATY FREEWAY, 600, HOUSTON /s/ E.C Tanner, Attorney-in-Fact 24 Feb 2026 0002058796

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OLN Common Stock Options Exercise +3,380 +221% 4,910 20 Feb 2026 Direct F1
transaction OLN Common Stock Tax liability $24,162 -1,003 -20% $24.09 3,907 20 Feb 2026 Direct
transaction OLN Common Stock Sale $57,700 -2,379 -61% $24.25 1,528 24 Feb 2026 Direct F2
holding OLN Common Stock 2 20 Feb 2026 By RSP Trustee F3

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 Restricted Stock Units Options Exercise $0 -3,380 -33% $0.000000 6,758 20 Feb 2026 Common Stock 3,380 Direct F1, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
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.