X0304 4/A 2012-03-15 2012-03-16 0 0001361538 Primoris Services Corp PRIM 0001489664 Killgore Michael D C/O PRIMORIS SERVICE CORPORATION 2100 MCKINNEY AVENUE, SUITE 1500 DALLAS TX 75201 1 1 0 0 Exec VP, Dir Const Svcs Common Stock 2012-03-15 4 P 0 4884 11.09 A 631986 D Purchased Common Stock shares as part of the Company's Long-Term Retention Plan. The Plan provides certain management employees the opportunity to purchase Company stock with a defined portion of their annual incentive compensation at a discount to the market price. For 2012, purchases were made at a 25% reduction to the average closing price during December 2011. Shares cannot be sold prior to September 23, 2012. The prior Form 4 filed by Michael D. Killgore on March 16, 2012 used incorrect codes in Table 1 for columns 3 and 4. The correct code for Table 1, column 3, should be "P" for "Purchased" and the correct code for Table 1, column 4, should be "A" for "Acquired." /s/ Peter J. Moerbeek, by power of attorney 2012-03-19