X0508 4 2025-12-31 0 0000874238 STERLING INFRASTRUCTURE, INC. STRL 0001134710 GRINDSTAFF NICHOLAS M 1800 HUGHES LANDING BLVD. SUITE 250 THE WOODLANDS TX 77380 0 1 0 0 Chief Financial Officer (CFO) 0 Common Stock 2025-12-31 4 F 0 61 306.23 D 5564 D Common Stock 2026-01-01 4 A 0 1029 0 A 6593 D These shares were retained by the Company at the election of the Reporting Person pursuant to a procedure approved by the Compensation Committee of the Board of Directors to satisfy the Company's tax withholding requirements (based on the closing price of the Company's common stock on the release date) arising from the release of restrictions as permitted by the plan pursuant to which the restricted stock unit award was made. The total share ownership includes 65 shares acquired under the Company's 2019 Employee Stock Purchase Plan. Represents the grant of time-vested restricted stock units that will vest in one-third increments on each of December 31, 2026, and the next two anniversaries thereof, provided the service conditions are satisfied. Of these shares, 6,402 shares are subject to restrictions on their sale or other transfer and to forfeiture under certain circumstances. Mark D. Wolf (Under a Power of Attorney) 2026-01-05