| 00206WB | T O' Reilly (Electrical Supplies) Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01171WB | T&T Equipment Ltd | YES | YES | T&T Fitness Systems Ltd | N/A | N/A | YES | YES | YES | YES |
| 01354W | T. & G. Somers Ltd | YES | NO | Energy Master | NO | NO | NO | NO | Reg-Pending | NO |
| 01522WB | T.O.S. Ireland Ltd | YES | YES | | N/A | N/A | N/A | N/A | N/A | YES |
| 00812W | T.P. Whelehan Son & Co. Ltd | YES | NO | T.P. Whelehan | YES | YES | YES | YES | YES | YES |
| 00178WB | Taramed Distribution Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01276WB | TCW Distribution Ltd | YES | YES | | N/A | N/A | YES | YES | YES | YES |
| 01297B | Tech-Source Ltd | NO | YES | | N/A | N/A | N/A | YES | YES | YES |
| 00111WB | Technico Limited | YES | YES | | YES | YES | YES | YES | YES | Reg-Pending |
| 00418W | Tecnomen Ltd | YES | NO | | YES | YES | YES | YES | YES | YES |
| 01565W | Tecoled Ltd | YES | NO | | NO | NO | NO | NO | NO | Reg-Pending |
| 00275WB | TEF Tullamore Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 00232WB | Tekelek Europe Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 00924WB | Tekno Surgical Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01137WB | TEL-VI-SAT Rory McLoughney Ltd | YES | YES | | N/A | YES | YES | YES | YES | YES |
| 01187W | Tempcheck | YES | NO | | N/A | N/A | N/A | Reg-Pending | Reg-Pending | NO |
| 00554W | Tennant & Ruttle Distribution Ltd | YES | NO | | YES | YES | YES | YES | YES | YES |
| 01076W | Teradata Ireland Ltd | YES | NO | | YES | N/A | YES | YES | YES | YES |
| 00124WB | Tesco Ireland Ltd | YES | YES | | YES | YES | YES | YES | YES | Reg-Pending |
| 01168WB | Tesco Mobile Ireland Ltd | YES | YES | | N/A | N/A | YES | YES | YES | YES |
| 01112WB | Thane Direct UK LTD | YES | YES | | N/A | N/A | YES | YES | YES | YES |
| 00625W | The Art of Light (Ire.) Ltd | YES | NO | | YES | Reg-Pending | Reg-Pending | Reg-Pending | Reg-Pending | NO |
| 00837W | The Biz Superstore Ltd | YES | NO | | N/A | YES | YES | YES | NO | NO |
| 01228B | The Buggyman Ltd | NO | YES | | N/A | N/A | N/A | YES | YES | YES |
| 00780WB | The Delph Centre | YES | YES | | YES | YES | YES | YES | YES | NO |
| 00105WB | The E.I. Company Ltd | YES | YES | EI Electronics | YES | YES | YES | YES | YES | YES |
| 01295WB | The Fone Factory Ltd | YES | YES | | N/A | N/A | N/A | YES | YES | YES |
| 01630B | The Forklift Centre Ltd | NO | YES | | N/A | N/A | N/A | N/A | Reg-Pending | Reg-Pending |
| 00149WB | The Lucan Electronic Equipment Company Ltd | YES | YES | Butler Technologies | YES | YES | YES | YES | YES | YES |
| 00508WB | The M.P. Doyle Group Ltd | YES | YES | | YES | YES | YES | YES | YES | Reg-Pending |
| 00195WB | The National Association for the Deaf | YES | YES | Deafhear.ie | YES | YES | YES | YES | YES | YES |
| 01346W | The Now Factory Ltd | YES | NO | | N/A | N/A | N/A | YES | YES | YES |
| 00521WB | The Phone Accessories Company Ltd | YES | YES | The Accessory Company | YES | YES | YES | YES | YES | YES |
| 00972W | The Real Massage Co. | YES | NO | | N/A | N/A | YES | YES | YES | YES |
| 00789WB | The Swatch Group (UK) Ltd | YES | NO | | YES | YES | YES | WEEE YES | WEEE YES | Reg-Pending |
| 01485WB | The Vapormatic Co. (Ireland) Ltd. | YES | YES | | Reg-Pending | Reg-Pending | Reg-Pending | Reg-Pending | Reg-Pending | Reg-Pending |
| 00728WB | The Watch Store | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01323W | Thomas McLaughlin (Ireland) Ltd | YES | NO | Bunzl McLaughlin | N/A | N/A | N/A | N/A | Reg-Pending | Reg-Pending |
| 00298WB | Thorn Lighting (Ireland) Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01209B | Tim Molloy Ltd | NO | YES | | N/A | N/A | N/A | YES | Reg-Pending | Reg-Pending |
| 00699WB | Timemark Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 00805WB | Titan Environmental Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01140WB | TJX Ireland | YES | YES | | N/A | YES | YES | YES | YES | YES |
| 00904WB | TMC Technology Ltd | YES | YES | Chip Electronics | YES | YES | YES | YES | YES | YES |
| 01139W | TMTS | YES | NO | | N/A | N/A | YES | YES | NO | NO |
| 00254W | TNS Distributions Ltd | YES | NO | TNS Distribution | YES | YES | YES | YES | YES | Reg-Pending |
| 01539B | Tokyo Electron Europe Ltd | NO | YES | Tokyo Electron Europe Ltd – Irish Branch | N/A | N/A | N/A | YES | YES | YES |
| 01188WB | Tom Murray Pharmacy Ltd | YES | YES | | N/A | N/A | YES | YES | YES | YES |
| 01113WB | Tooling & Engineering Distributors (TED) Ltd | YES | YES | TED Ltd | N/A | N/A | N/A | YES | YES | YES |
| 01350W | Toomey Audio Visual Ltd | YES | NO | | YES | YES | YES | YES | YES | YES |
| 00360WB | Topcon Europe B.V. | YES | YES | Topcon Ireland | YES | YES | YES | YES | YES | YES |
| 00122WB | Toshiba TEC Europe Retail Information System S.A. | YES | YES | | YES | YES | YES | YES | YES | Reg-Pending |
| 01419WB | Total Energy Controls Distributors Ireland Ltd | YES | YES | EnviroQuip | NO | Reg-Pending | Reg-Pending | Reg-Pending | Reg-Pending | NO |
| 01386B | Total Power Solutions Ltd | NO | YES | | N/A | N/A | N/A | Reg-Pending | Reg-Pending | Reg-Pending |
| 01236W | Total Source Ltd | YES | NO | | YES | N/A | N/A | Reg-Pending | Reg-Pending | NO |
| 01523WB | Toyland Cash & Carry Ltd | YES | YES | | N/A | N/A | N/A | Reg-Pending | Reg-Pending | Reg-Pending |
| 01214WB | Toymark Ltd | YES | YES | | N/A | N/A | N/A | Reg-Pending | Reg-Pending | NO |
| 00753WB | Toymaster Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01258B | Toyota Ireland | NO | YES | | N/A | N/A | N/A | YES | YES | YES |
| 00485W | TQC Ltd | YES | NO | | YES | YES | YES | YES | YES | YES |
| 00941W | Trasmore Limited | YES | NO | Dental Medical Ireland | YES | YES | YES | YES | YES | YES |
| 00912W | Trend Micro (EMEA) Ltd | YES | NO | Trend Micro | YES | YES | YES | YES | YES | YES |
| 01235WB | Triace Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01605WB | Trulife Ltd | YES | YES | | N/A | N/A | N/A | N/A | Reg-Pending | Reg-Pending |
| 01347W | Trustwater Ltd | YES | NO | Hydrofem Ltd | N/A | YES | YES | YES | YES | YES |
| 00746WB | TTS Tooltechnic Systems (Ireland) Ltd | YES | YES | TTS Tooltechnic Systems Ireland Ltd | YES | YES | YES | YES | YES | YES |
| 01508WB | Tuaslagan Tuillteanais Teoranta | YES | YES | Merit Solutions | NO | NO | NO | NO | Reg-Pending | Reg-Pending |
| 00144WB | Tucks Limited | YES | YES | | YES | YES | YES | YES | YES | YES |
| 01556W | TV Parts Ltd | YES | NO | tvtrade.ie | NO | NO | NO | NO | NO | Reg-Pending |
| 00491WB | Tyrell Content Creation Tools Ireland Ltd | YES | YES | | YES | YES | YES | YES | YES | YES |