PATRICK INDUSTRIES INC

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

(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:

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 8.01 Other Events.

As previously disclosed, on June 30, 2026, Patrick Industries, Inc., an Indiana corporation (the “Company”), LCI Industries, a Delaware corporation (“LCI”), Planet First Merger Sub Inc., a newly formed Delaware corporation and a direct wholly owned subsidiary of the Company (“First Merger Sub”), and Planet Second Merger Sub LLC, a newly formed Indiana limited liability company and a direct wholly owned subsidiary of the Company (“Second Merger Sub”), entered into an Agreement and Plan of Merger (the “Merger Agreement”).

The Merger Agreement provides for, among other things and subject to the satisfaction or waiver of the conditions set forth therein, the merger of First Merger Sub with and into LCI (the “First Merger”), with LCI surviving the First Merger as a direct wholly owned subsidiary of the Company, followed immediately by the merger of LCI with and into Second Merger Sub (the “Second Merger” and, together with the First Merger, the “Mergers”), with Second Merger Sub surviving the Second Merger as a direct wholly owned subsidiary of the Company.

On August 5, 2026, the Company and LCI each filed their respective Premerger Notification and Report Forms pursuant to the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended (the “HSR Act”), with the Federal Trade Commission (the “FTC”) and the Antitrust Division of the U.S. Department of Justice (the “DOJ”) in connection with the Mergers. On September 4, 2026, the Company voluntarily withdrew its HSR Act notification and, on September 9, 2026, refiled its HSR Act notification with the FTC and the DOJ. The refiling initiated a new waiting period under the HSR Act.

The expiration or termination of the applicable waiting period under the HSR Act is one of the conditions to the completion of the Mergers. The Mergers remain subject to the satisfaction or waiver of the other closing conditions set forth in the Merger Agreement.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit 104 - Cover Page Interactive Date File (embedded within the Inline XBRL document)