STERLING INFRASTRUCTURE, INC.

On September 23, 2026, Joseph A. Cutillo, the Company’s Chief Executive Officer and a director of the Company, entered into a “Rule 10b5-1 trading arrangement”, as defined in Item 408(a) of Regulation S-K (“the Plan”), for the sale of 190 thousand shares of the Company’s common stock. The Plan is scheduled to begin on December 23, 2026 and terminates upon the sale of all the shares subject to the Plan or December 31, 2027, whichever occurs first.

Other than as set forth above, during the quarter ended September 30, 2026, no other director or officer (as defined in Rule 16a-1(f) of the Securities Exchange Act of 1934) of the Company adopted orterminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408(a) of Regulation S-K. Actual sale transactions for pre-existing “Rule 10b5-1 trading arrangements” or “non-Rule 10b5-1 trading arrangements” have been disclosed publicly in filings with the SEC in accordance with applicable securities laws, rules and regulations.

As previously disclosed on July 10, 2026, on July 6, 2026, Mark D. Wolf, former General Counsel, Chief Compliance Officer and Corporate Secretary of the Company, notified the Company of his intention to retire before the end of 2026. On October 29, 2026, Mr. Wolf notified the Company that his last day with the Company will be November 9, 2026.