- Smiths
- Smoky Mountain Machining Inc.
- SMS Demag, Inc.
- SMUD
- Smurfit-Stone Container Corp - Missoula
- Smyth County Community Hospital
- Snavely Forest Products Inc.
- SNC Lavalaw
- Snechma USA
- Snelling Staffing Personnel
- Snerma USA Inc.
- SNL Coaching
- Snohomish County
- Snohomish County Council
- Snohomish County Council-District 2
- Snow Ball Foods, LLC
- Snow Cap Inn
- Snow College
- Snow Lake Lodge, West Dover VT
- Snowbird Corp.
- SOC for Biomolecular Screening
- Society for Protective Coatings
- Society for the Preservation and Encouragement of Barber Shop Quartet in America SPEBSQSA)
- Society of Actuaries
- Society of Association Executives of Puerto Rico
- Society of Consumer Affair Professionals in Business
- Society of Critical Care Medicine
- Society of Economics Geologists
- Society of Fire Protection Engineers
- Society of Government Meeting Professionals
- Society of Government Travel Professionals
- Society of Independent Gasoline Marketers of America SIGMA)
- Society of Permanent Cosmetic Professionals
- Society of Petroleum Engineers
- Society of Professional Journalists
- Society of Teachers of Family Medicine
- Socius Corporation
- SOD University of Arizona
- Sodexo Quality of Life Services
- SoftEdge Inc.
- Softscape
- Software Management, Inc.
- Software Solutions
- Solano Coalition for Better Health
- Solano County
- Solano County Sheriff's Office
- Solara Hospitals - McAllen and Edinburg
- Solara Specialty Hospitals Harlingen
- Solaris Health System
- Soldiers and Sailors Memorial Hospital