STERLING INFRASTRUCTURE, INC.

This proxy statement (“proxy statement”), along with the accompanying notice of annual meeting of shareholders, is furnished on behalf of Sterling Infrastructure, Inc., a Delaware corporation (the “Company”), by its board of directors (“board” or “board of directors”) in connection with the solicitation of your proxy to be voted at the 2026 annual meeting of shareholders of the Company (“annual meeting”). In this proxy statement, unless the context suggests or requires otherwise, references to “Sterling,” “we,” “us” and “our” mean the Company, and, as appropriate, our subsidiaries. This summary highlights selected information contained elsewhere in this proxy statement. This summary does not contain all of the information that you should consider, and you should read the entire proxy statement carefully before submitting your proxy and voting instructions. For more information regarding our 2025 financial and operational performance, please review our 2025 annual report to shareholders (“2025 annual report”). The 2025 annual report, including financial statements, is first being made available to share holders together with this proxy statement on or about March 25, 2026.