| Burl Schmitz | Primoris | Regular Member |
| Jim Scholl | Lhoist | Associate Member |
| Eric Schranz | Austin Bridge & Road | Regular Member |
| Stephen Schuh | Capitol Aggregates | Associate Member |
| Noel Schulz | Jebro | Major Associate Member |
| Jeff Seaman | Closner Equipment Company | Associate Member |
| Clay Segers | A.L. Helmcamp | Regular Member |
| John Shanks | (not set) | Associate Member |
| Steven Simmons | Huitt-Zollars, Inc. | Other |
| Pat Slattery | ROMCO Equipment Co. | Associate Member |
| Lauren Slevik | TXAPA | Other |
| devin smith | Knife River | Regular Member |
| Laraine Smith | Wright Asphalt | Regular Member |
| Armando Sotelo | Lhoist | Associate Member |
| Bruce Spracklen | Beyond Engineering & Testing LLC | Associate Member |
| Dan Staebell | Colorbiotics | Associate Member |
| Stephanie Sterba | Stansteel-Hotmix Parts | Associate Member |
| Tim Stone | US Lime | Associate Member |
| David Stroud | Ergon Asphalt & Emulsions, Inc. | Associate Member |
| Eric Suarez | Primoris | Regular Member |
