144 0001704011 XXXXXXXX LIVE 0001361538 Primoris Services Corp 001-34145 2300 N. FIELD STREET, SUITE 1900 DALLAS TX 75201 214-740-5600 McCormick Thomas Edward AFFILIATE COMMON RBC CAPITAL MARKETS LLC

250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401

109889 7262399.00 54001988 05/06/2025 NYSE COMMON 03/01/2023 COMPENSATION PLAN ISSUER N 109889 03/01/2023 N/A N THOMAS MCCORMICK C/O RBC CAPITAL MARKETS LLC

250 NICOLLET MALL, SUITE 1700 MINNEAPOLIS MN 55401

PRIMORIS SERVICES CORPORATION 03/17/2025 61390 3935080.00 05/06/2025 POA / JEFFREY EISCHENS