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

Role
VP & Treasurer
Signature
/s/ E.C. Tanner, Attorney-in-Fact
Issuer symbol
OLN
Transactions as of
20 Feb 2026
Net transactions value
-$16,237
Form type
4
Filing time
24 Feb 2026, 17:23:32 UTC
Previous filing
20 Feb 2026
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 24 Feb 2026 0001729998

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction OLN Common Stock Options Exercise +2,318 +13% 19,596 20 Feb 2026 Direct F1
transaction OLN Common Stock Tax liability $16,237 -674 -3.4% $24.09 18,922 20 Feb 2026 Direct
holding OLN Common Stock 141 20 Feb 2026 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 Restricted Stock Units Options Exercise $0 -2,318 -33% $0.000000 4,634 20 Feb 2026 Common Stock 2,318 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Restricted stock units convert into common stock on a one-on-one basis.
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 February 20, 2026.
F3 On February 20, 2025 the reporting person was granted 6,952 restricted stock units, 2,318 shares vested on February 20, 2026, 2,317 shares vest on February 20, 2027 and 2,317 shares vest on February 20, 2028.