STRL: Company disclosure

Item 7.01 Regulation FD Disclosure. On June 9, 2026, Sterling Infrastructure, Inc. (the “Company”) issued a press release announcing that it has closed on the acquisition of Stone Ridge Contracting, LLC., a Pocatello, Idaho-based site development contractor. A copy of the press release is furnished herewith as Exhibit 99.1 and incorporated herein by reference. The information set forth in Item 7.01, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that Section. The information in this Item 7.01, including Exhibit 99.1, shall not be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such a filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits Exhibit Number Description 99.1 Press release, dated June 9, 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL document) 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. STERLING INFRASTRUCTURE, INC. Date: June 9, 2026 By: /s/ Mark D. Wolf Mark D. Wolf General Counsel and Corporate Secretary