By client
- Taikang Life Insurance Co Ltd. (Taikang)
- Taishin International Bank
- Taiwan High Speed Rail Corporation (THSRC)
- Takeda
- Talent2
- Tallink Group
- Tata Sky
- Tata Steel Europe
- Tateyama System Laboratory
- Taunton Deane Borough Council
- TaunusSparkasse
- Tax Tech
- Tayside Fire and Rescue
- TBC Corporation
- TBC
- TCCT
- TD Bank Group
- TD Banknorth
- TDC Hosting
- TDX
- TEAM Truck Centres
- Tecan Group Ltd.
- Techem
- Technical University of Berlin
- Technische Universität München
- Teikoku Databank, Ltd.
- Tejon Ranch
- TELARUS-Australia & New Zealand
- TelecityGroup Finland
- Telecom Argentina
- Telecom Italia
- Telefonica | Vivo
- Telekom Slovenia Group (Video)
- Telekom Slovenia Group
- Telekomunikacja Polska
- Telenet
- Telenor
- Telephony Leader
- Telerx
- Tele Ticket Service
- Television Broadcasts Limited
- TeliaSonera Business Services
- Temenos Group AG
- Temenos
- Temple University
- Tennessee Valley Authority (TVA)
- TEOCO
- Teradyne Corporation
- Terna—Rete Elettrica Nazionale S.p.A
- Terna
- TerraEchos
- Terranova
- Terveystalo
- TestPro
- Texas Education Agency
- Texspin Bearings
- The British Medical Association
- The Celtic Manor Resort
- The Chaoyang Municipal Government
- The City of Albuquerque
- The City of Fort Worth
- The City of Norfolk
- The City University of New York (CUNY)
- The Co-operative Food
- The Doncasters Group
- The Dragon
- The Driver and Vehicle Licensing Agency (DVLA)
- The Environmental Protection Agency Ireland (EPA)
- The German Aerospace Center (DLR)
- The HallStar Company
- The Hartmann Group
- The Hartree Centre
- theHRfiles
- The Institute of Physics of the Academy of Sciences of the Czech Republic
- The Marine Institute