- A-Tec Recycling Inc
- Access Systems
- Advance Services, Inc.
- Agilent Technologies
- Airbnb for Work
- American Type Culture Collection (ATCC)
- Anixter
- Apple
- AT&T
- Avantor (formerly VWR) (Secondary)
- B&G Productions INC
- B&H Photo
- Beckman Coulter
- Beltmann Group, Inc
- Big Belly
- Bio-Rad
- Blick Art Supply
- Carolina Biological
- CDW Government
- Celebrations Party & Rental
- Cintas
- Collegiate Travel Planners (CTP)
- Complete Book & Media
- Conviron
- Courtyard by Marriott
- Covetrus
- Dell
- Des Moines Register
- Des Moines Register (Classified and Display Ads)
- Diversity Travel
- Enterprise/National
- Eppendorf
- Executive Coaching Services - Multiple Suppliers
- Fisher Scientific
- Gateway Hotel and Conference Center
- Genscript USA Inc.
- Glass Pay
- Grainger
- GrandStay Hotel & Suites
- Grant Writers Seminars & Workshops
- Graybar
- Henry Schein
- Hilton Garden Inn
- Idexx Laboratories Inc
- Illumina
- Integrated DNA Technologies
- Jet Co Solutions LLC
- KwikBoost
- Life Interpretation
- Life Technologies Corp
- Lowe's
- Lyft
- McClanahan Studio LC
- McKesson
- Medline
- Midco
- Midwest Veterinary Supply
- Millipore Sigma
- Model Farm
- MWI Veterinary Supply
- New England Biolabs
- Newark Electronics
- Nuaire Inc.
- ODP Business Solutions (formerly Office Depot)
- Ologie
- Olympus
- Partners for Educational Development Inc
- Percival Scientific (Primary)
- Portable Pro - Mobile Toilet Service
- Promega
- PUSH Branding and Design
- Qiagen Inc.
- Racom
- Radisson Hotel Ames Conference Center
- Rainin
- Rasmussen Mechanical Services Inc (BalCon)
- REMI
- Revvity (previously Perkin Elmer)
- Search Firms - Multiple Suppliers
- Setwise Technology
- Shift Interactive
- Staples Promotional Items
- Stephanie Sabin
- T-Mobile
- Task Chairs - Multiple Suppliers
- The Shredder (Green Resource Management)
- TownPlace Suites Ames
- Tradebe Treatment and Recycling
- U.S. Cellular
- United Rentals
- Verbit
- Verizon
- Vraiment Financial LLC
- Waste Management
- Waters Technology Corp (Secondary)
- Webspec Design
- Windstar Lines, Inc.
- Workspace Inc.
- Wynn O Jones and Associates Incorporated
- ZLR Ignition - Advertising Agency Services
- Zoetis