Lennox International 8-K 2026-05-21

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): May 21, 2026

LENNOX INTERNATIONAL INC.

(Exact name of registrant as specified in its charter)

2140 LAKE PARK BLVD.,

RICHARDSON, Texas 75080

(Address of principal executive offices, including zip code)

Registrant’s telephone number, including area code:

(972)497-5000

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):

Securities registered pursuant to Section 12(b) of the Act:

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. ☐

On May 23, 2026 , Sivasankaran Somasundaram notified Lennox International Inc. (the “Company”) of his decision to resign from the Board of Directors of the Company, effective immediately. Mr. Somasundaram made this decision in consideration of his other professional responsibilities and time commitments. Mr. Somasundaram’s resignation was not the result of any disagreement with the Company on any matter relating to the Company’s operations, policies, or practices. In connection with Mr. Somasundaram’s departure, the Board has reduced the size of the Board from nine members to eight members.

On May 21, 2026, the Company held its Annual Meeting. During this meeting, the Company’s stockholders were asked to consider and vote upon three proposals: (1) the election of three Class I Directors to the Board of Directors to serve for a three-year term, which expires at the 2029 annual meeting of stockholders; (2) an advisory vote to approve the compensation of the Company’s named executive officers; and (3) the ratification of the appointment of Ernst & Young LLP as the Company’s independent registered public accounting firm for the 2026 fiscal year.

On the record date of March 26, 2026, there were 34,817,885 shares of the Company’s common stock issued and outstanding and entitled to be voted at the Annual Meeting. For each proposal, the results of the stockholder voting were as follows:

This advisory vote on the compensation of the Company’s named executive officers received the approval of approximately 98% of the stockholders voting for and against this item.

SIGNATURES

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.

LENNOX INTERNATIONAL INC.