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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM 8-K
CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
Date of Report (Date of earliest event reported): July 30, 2026
OLIN CORPORATION
(Exact name of registrant as specified in its charter)

Virginia | 1-1070 | 13-1872319
(State or Other Jurisdiction of Incorporation) | (Commission File Number) | (IRS Employer Identification No.)

190 Carondelet Plaza, | Suite 1530 | Clayton, | MO | 63105
(Address of principal executive offices) | (Zip Code)

(314) 480-1400
(Registrant’s telephone number, including area code)
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):
☐ | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
☐ | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
☐ | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
☐ | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))
Securities registered pursuant to Section 12(b) of the Act:
Title of each class | Trading Symbol | Name of each exchange on which registered
Common Stock, $1.00 par value per share | OLN | New York Stock Exchange
Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).
☐ | Emerging growth company
☐ | If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

Item 2.02. Results of Operations and Financial Condition.
On July 30, 2026, Olin Corporation (“Olin”) issued a press release announcing financial results for the second quarter ended June 30, 2026. Attached as Exhibit 99.1, and incorporated by reference into this Item 2.02, is a copy of Olin’s press release dated July 30, 2026.
Item 9.01. Financial Statements and Exhibits.

(d) Exhibit No. | Exhibit
99.1 | Press Release announcing second quarter 2026 earnings, dated July 30, 2026
104 | Cover Page Interactive Data File (embedded within the Inline XBRL document)

SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

| OLIN CORPORATION
| By: | /s/ Inchan Hwang
|  | Name: | Inchan Hwang
|  | Title: | Vice President, Deputy General Counsel and Secretary

Date: July 30, 2026