STERLING INFRASTRUCTURE, INC.

On May 14, 2026, Dwayne A. Wilson, adirector of the Company, entered into a “Rule 10b5-1 trading arrangement”, as defined in Item 408(a) of Regulation S-K, for the sale of 2,085 shares of common stock. The trading arrangement was scheduled to begin on August 13, 2026 and terminate upon the sale of all shares or August 20, 2027, whichever occurred first. On May 21, 2026, Mr. Wilson terminated the trading arrangement in order to enter into a replacement arrangement on revised terms. No trades were executed under the terminated trading arrangement. On June 15, 2026, Mr. Wilson entered into a “Rule 10b5-1 trading arrangement” for the sale of 2,087 shares of common stock. The trading arrangement begins on September 15, 2026 and terminates upon the sale of all shares or September 15, 2027, whichever occurs first.

During the quarter ended June 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.