- San Antonio Military Medical Center
- San Antonio River Authority
- San Antonio Surgical Arts
- San Jacinto College
- San Jacinto College, Health, Behavioral Science, Physical Education and Dance
- San Juan Nursing Home Inc.
- Saturn of San Antonio
- SBC - Houston
- SBC - San Antonio
- Schipul Technologies Inc.
- Semarca Corporation
- Service Corporation International
- Seton Northwest Medical Center
- Shannon Medical Center
- Sheraton Houston Brookhollow Hotel
- Shirley Wills and Associates
- Sierra Medical Center
- Silicon Labs
- Simeus Foods International Inc.
- SLEH-THI
- Smart Kids Software
- Smith International Inc.
- Society of Petroleum Engineers
- Solara Hospitals - McAllen and Edinburg
- Solara Specialty Hospitals Harlingen
- Somervell Co. VFD
- South Padre Island Texas Convention and Visitors Bureau
- South Texas Blood and Tissue Center
- South Texas ENT Consultants
- South Texas Health System
- South Texas Spinal Clinic
- South Texas Veterans Health Care System, Audie Murphy Division
- Southern Avionics Company
- Southwest Airlines
- Southwest Transplant Alliance
- Space Center Houston Rotary
- Spring Branch Medical Center
- St. David's Georgetown Hospital
- St. David's HealthCare
- St. David's Medical Center
- St. David's North Austin Medical Center
- St. David's Round Rock Medical Center
- St. David's South Austin Medical Center
- St. Joseph Medical Center
- St. Joseph Medical Center in The Heights
- St. Luke's Baptist Hospital
- Stanley Consultants, Inc. - Austin
- Star of Hope
- Starr County Memorial Hospital
- State Representative Carlos I. Uresti