| Swft Clinical Services Ltd | Health & social care | 2011 |
| Swiss Railways Society | Other services | 2016 |
| Switch IT UP Tanning and Beauty Ltd | Other services | 2023 |
| Switch Warwick Ltd | Hospitality | 2022 |
| SY Build Renovation Ltd | Construction | 2025 |
| Sycamore Court (Kineton) Limited | Administrative & support | 1997 |
| Sycamore WSM Ltd | Real estate | 2020 |
| Symmetry Solutions Ltd | Professional & scientific | 2009 |
| Synaptic Potential Limited | Administrative & support | 2010 |
| Synco Ventures Live Ltd | Professional & scientific | 2025 |
| Synergy Projects Warwickshire Limited | Real estate | 2026 |
| Synergy Property Ventures Ltd | Real estate | 2023 |
| Synevital Biofoodtech Limited | Wholesale & retail | 2024 |
| Synkaura Holdings Ltd | Information & communication | 2026 |
| Synnefa Limited | Information & communication | 2023 |
| Syrve Limited | Information & communication | 2022 |
| Systematic Strategy Limited | Manufacturing | 2005 |
| T & C Homes Ltd | Real estate | 2021 |
| T & D Chapman Limited | Households | 2021 |
| T & K Ellis Limited | Administrative & support | 2019 |
| T J Sunderland Limited | Health & social care | 2011 |
| T Manners Consulting Ltd | Professional & scientific | 2021 |
| T Whiting Consultancy Limited | Professional & scientific | 2020 |
| T&K Law Limited | Information & communication | 2017 |
| T. Williams Engineering Ltd | Construction | 2019 |
| T.C.L. Tool Hire Limited | Construction | 1988 |
| T.L.C.C. Limited | Wholesale & retail | 1993 |
| T2 Developments Limited | Construction | 2018 |
| T22 Properties Ltd | Real estate | 2022 |
| T2S Group UK Limited | Administrative & support | 2025 |
| T5 Kustom Vanz Limited | Wholesale & retail | 2013 |
| T92 Solutions Ltd | Information & communication | 2015 |
| TAC11 Limited | Administrative & support | 2017 |
| TAC11 Property Limited | Real estate | 2022 |
| Tact Services Limited | Professional & scientific | 2016 |
| Taiga Europe UK Ltd | Wholesale & retail | 2023 |
| Tailor Communications Limited | Professional & scientific | 2011 |
| Talented Tree Ltd | Administrative & support | 2018 |
| Talenttech Recruitment Holdings Limited | Administrative & support | 2023 |
| Talenttech Recruitment Ltd | Administrative & support | 2019 |
| Talk Therapy (UK) Limited | Education | 2015 |
| Talklink Solutions Limited | Construction | 2026 |
| Tamar Technologies Ltd | Information & communication | 2019 |
| Tamara Peel Photography Limited | Other services | 1997 |
| Tangled Consulting Ltd | Professional & scientific | 2026 |
| Tangreen Ltd | Professional & scientific | 1997 |
| Tanna Estates Limited | Real estate | 2018 |
| Tannery Court Management (Abergele) Limited | Households | 2007 |
| TAP Stratford Limited | Health & social care | 2025 |
| TAP Warwick Limited | Health & social care | 2026 |
| Tapaszampa Ltd | Hospitality | 2021 |
| Taprogge U.K. Limited | Wholesale & retail | 1963 |
| Tara.Masiya Ltd. | Health & social care | 2013 |
| Target Builders Merchants Limited | Wholesale & retail | 2022 |
| Target Marketing Ltd | Professional & scientific | 2013 |
| TAS Commerce Ltd | Wholesale & retail | 2025 |
| Tata Technologies Europe Limited | Information & communication | 1986 |
| Tawny Studios Limited | Arts & recreation | 2025 |
| Taxi Seven Limited | Transport & logistics | 2018 |
| Taylor Funding Limited | Financial services | 2021 |
| Taylor Properties Construction Ltd | Construction | 2026 |
| Taylor ST Chad's Limited | Construction | 2022 |
| Taylor's Brickwork Ltd | Construction | 2010 |
| Taylor-Watts Limited | Information & communication | 2001 |
| Taylors Asset Management Limited | Financial services | 2000 |
| Taylors Investments Limited | Financial services | 2002 |
| Taylors Risk and Healthcare Limited | Professional & scientific | 2000 |
| Tayton Consultants Limited | Professional & scientific | 2009 |
| TB Commercial Property (Leamington) Limited | Real estate | 2026 |
| TB Commercial Property Holdings Limited | Financial services | 2026 |
| TB Residential Limited | Real estate | 2018 |
| TBF Holidays Limited | Real estate | 2013 |
| Tea for Three Ltd | Administrative & support | 2025 |
| Teal & Tern Ltd | Wholesale & retail | 2021 |
| Team Richey Limited | Arts & recreation | 2018 |
| Team Training Programming Ltd | Arts & recreation | 2018 |
| Team USF Limited | Arts & recreation | 2022 |
| Teamengine Software Ltd | Information & communication | 2019 |
| Tech - EX Systems Ltd | Manufacturing | 2008 |
| Techcomlight Limited | Other services | 2019 |
| Technical Labs Limited | Information & communication | 2006 |
| Technological Engineering Productions Limited | Manufacturing | 1976 |
| Technology Strategy Consultants Ltd | Professional & scientific | 2004 |
| Techverse Services Limited | Information & communication | 2025 |
| Tekasco Limited | Information & communication | 2009 |
| Teknika Plast UK Ltd | Wholesale & retail | 2025 |
| Telavox Limited | Information & communication | 2015 |
| Tele-Fonika Holdings Limited | Administrative & support | 2015 |
| Telent Communications International Limited | Professional & scientific | 1949 |
| Telephony-Business-Solutions Ltd | Information & communication | 2006 |
| Temperance Trail Limited | Other services | 2025 |
| Temployer Ltd | Information & communication | 2015 |
| Temporary Solar Limited | Professional & scientific | 2014 |
| Tender Angels Memorial Care Ltd | Administrative & support | 2019 |
| Tenstar Simulation Ltd | Manufacturing | 2013 |
| Teplo Ltd | Hospitality | 2024 |
| Terra Computer Ltd | Wholesale & retail | 2012 |
| Terracotta Sombrero Ltd | Information & communication | 2026 |
| Test Port Limited | Professional & scientific | 2017 |
| Test SAM Ltd | Information & communication | 2017 |