144/A 0001950047-23-001818 0001440820 XXXXXXXX LIVE 0001361538 Primoris Services Corp 001-34145 2300 N. FIELD STREET, SUITE 1900 DALLAS TX 75201 214-740-5600 Schauerman John P. Board Member Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 38th Floor New York NY 10004

20000 603036.00 53282636 06/21/2023 NYSE Common 07/31/2008 Merger/Acquisition Issuer N 19834 07/31/2008 Not Applicable Common 02/17/2017 Restricted stock vesting under a registered plan Issuer N 166 02/17/2017 Not Applicable N SCHAUERMAN FAMILY TRUST

2300 N. Field Street Suite 1900 Dallas TX 75201

Common 06/02/2023 20000 554000.00 This amendment is being filed to restate the approximate date of sale is June 21, 2023. Name of Person for whose Account the Securities are to be Sold is Schauerman Family Trust. 06/22/2023 /s/ John P Schauerman, as Trustee