2 unchanged sentences
(b) Not Applicable.
−Removed: (c) During the three months ended March 31, 2026, no director or officer of Olin adopted, terminated or modified a ‘Rule 10b5-1 trading arrangement’ or ‘non-Rule 10b5-1 trading arrangement,’ as each term is defined in Item 408(a) of Regulation S-K.
+Added: (c) During the three months ended June 30, 2026, no director or officer of Olin adopted, terminated or modified a ‘Rule 10b5-1 trading arrangement’ or ‘non-Rule 10b5-1 trading arrangement,’ as each term is defined in Item 408(a) of Regulation S-K.
Exhibit Exhibit Description
+Added: 2.1 Agreement and Plan of Merger, dated as of June 15, 2026, by and among Olin Corporation, Huntsman Corporation, Olympus Merger Sub, Inc.
+Added: and Hook Merger Sub LLC—Exhibit 2.1 to Olin’s Form 8-K filed June 16, 2026 **
3.1 Bylaws of Olin Corporation as amended effective April 30 , 2026 —Exhibit 3.1 to Olin’s Form 8-K filed April 30, 2026 *
−Removed: 4.1 Fourteenth Amendment, dated February 19, 2026, to Amended and Restated Credit and Funding Agreement, dated as of February December 9, 2010 among Olin Corporation, the Lenders (as defined therein) and PNC Bank, National Association, as administrative agent – Exhibit 4.22 to Olin’s Form 10-K filed February 20, 2026 *
−Removed: 10.1 First Amendment, dated February 19, 2026, to Credit Agreement, dated as of March 14, 2025, among Olin Corporation, the Lenders and Issuing Banks (as defined therein) and Bank of America, N.A., as administrative agent – Exhibit 10.31 to Olin’s Form 10-K filed February 20, 2026 *
+Added: 10.1 Olin Corporation 2026 Long Term Incentive Plan—Exhibit 10.1 to Olin's Form 8-K filed April 30, 2026 *
+Added: 10.2 Form of Directors Stock Grant Notice and Award Agreement—Exhibit 10.2 to Olin’s Form 8-K filed April 30, 2026*
+Added: 10.3 Form of Restricted Stock Unit Grant Notice and Award Agreement—Exhibit 10.3 to Olin’s Form 8-K filed April 30, 2026 *
+Added: 10.4 Form of Performance Share Unit Grant Notice and Award Agreement—Exhibit 10.4 to Olin’s Form 8-K filed April 30, 2026 *
+Added: 10.5 Form of Non-Qualified Stock Option Grant Notice and Award Agreement—Exhibit 10.5 to Olin’s Form 8-K filed April 30, 2026 *
31.1 Section 302 Certification Statement of Chief Executive Officer
11 unchanged sentences
1-1070 unless otherwise indicated.
+Added: **The schedules to the Agreement and Plan of Merger have been omitted from this filing pursuant to Item 601(b)(2) of Regulation S-K.
+Added: Olin agrees to furnish a supplemental copy of such schedules to the Securities and Exchange Commission upon its request.
† Indicated management contract or compensatory arrangement.
3 unchanged sentences
(Authorized Officer)
+Added: July 31, 2026
Compared sentence by sentence after normalising whitespace, quotation marks, case and digits, so re-formatting and restated figures do not read as changed language. Wording changes appear as one removal and one addition. The current filing and the prior one are authoritative.