UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM SD
SPECIALIZED DISCLOSURE REPORT
LENNOX INTERNATIONAL INC.
(Exact name of registrant as specified in its charter)
Delaware (State or other jurisdiction of incorporation or organization) | 001-15149 (Commission File Number) | 42-0991521 (I.R.S. Employer Identification No.) | ||||||
2140 Lake Park Blvd.
Richardson, Texas 75080
(Address of principal executive offices, including zip code)
Monica M. Brown
Executive Vice President, Chief Legal Officer and Secretary
(972) 497-5000
(Name and telephone number, including area code, of the person to contact in connection with this report)
Check the appropriate box to indicate the rule pursuant to which this Form is being submitted, and provide the period to which the information in this Form applies:
☒ Rule 13p-1 under the Securities Exchange Act (17 CFR 240.13p-1) for the reporting period from January 1 to December 31, 2025.
☐ Rule 13q-1 under the Securities Exchange Act (17 CFR 240.13q-1) for the fiscal year ended _______________.
Section 1 – Conflict Minerals Disclosure
Item 1.01. Conflict Minerals Disclosure and Report.
Conflict Minerals Disclosure
Lennox International Inc. (including its consolidated subsidiaries, the “Company”) is filing this Form SD pursuant to Rule 13p-1 under the Securities Exchange Act of 1934 for the reporting period from January 1, 2025 to December 31, 2025 (the “Reporting Period”).
In October 2025, the Company completed the acquisition of the Duro Dyne Buyer, Inc. (“Duro Dyne”) and Sealed Unit Parts Buyer, Inc. (“Supco”) businesses and brands. Duro Dyne and Supco were not subject to conflict minerals reporting requirements prior to the acquisition. Pursuant to the rules of the Securities and Exchange Commission, Duro Dyne and Supco are not included in this 2025 report.
Rule 13p-1, through Form SD, requires the disclosure of certain information if a company manufactures or contracts to manufacture products for which certain “conflict minerals” (as defined below) are necessary to the functionality or production of such products. Form SD defines “conflict minerals” as: (i)(a) columbite-tantalite (or coltan, the metal ore from which tantalum is extracted), (b) cassiterite (the metal ore from which tin is extracted), (c) gold and (d) wolframite (the metal ore from which tungsten is extracted), or their derivatives, which are currently limited to tantalum, tin and tungsten; or (ii) any other mineral or its derivatives determined by the U.S. Secretary of State to be financing conflict in the Democratic Republic of the Congo or an “adjoining country,” as such term is defined in Form SD (collectively, the “Covered Countries”).
The Company’s operations may at times manufacture, or contract to manufacture, products for which conflict minerals are necessary to the functionality or production of those products (collectively, the “products”). As required by Form SD, the Company has conducted a good faith reasonable country of origin inquiry (“RCOI”) regarding the conflict minerals included in its products during the Reporting Period, which the Company refers to as the “Subject Minerals,” to determine whether any such Subject Minerals originated in the Covered Countries and/or whether any of the Subject Minerals were from recycled or scrap sources. Where applicable, the Company has conducted additional due diligence regarding the sources of the Subject Minerals. The results of the Company’s RCOI regarding the Subject Minerals, as well as its additional due diligence regarding the sources of such Subject Minerals, are contained in the Company’s Conflict Minerals Report, a copy of which is filed as Exhibit 1.01 to this Form SD, and is publicly available at www.lennox.com by following the links “Investors — Corporate Governance — Documents & Charters.” The content on, or accessible through, any website referred to in this Form SD is not incorporated by reference into this Form SD unless expressly noted.
Item 1.02. Exhibit.
The Company’s Conflict Minerals Report is included as Exhibit 1.01 to this Form SD.
Section 2 – Resource Extraction Issuer Disclosure
Not applicable.
Section 3 – Exhibits
Item 3.01. Exhibits.
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 duly authorized undersigned.
LENNOX INTERNATIONAL INC. By: /s/ Monica M. Brown Name: Monica M. Brown Title: Executive Vice President, Chief Legal Officer Date: May 27, 2026 | ||||||||