| T & K Furniture Limited | Wholesale & retail | 2000 |
| T & L Gillies Drylining Ltd | Construction | 2012 |
| T Angel Ltd | Health & social care | 2023 |
| T Balen Ltd | Real estate | 2014 |
| T Couper Limited | Other services | 2021 |
| T Lawrence Ltd | Public administration | 2019 |
| T&S Local Express Ltd | Wholesale & retail | 2023 |
| T&S Reptiles Ltd | Wholesale & retail | 2020 |
| T.A Nails by R & J Ltd | Other services | 2024 |
| T.S. Space Systems Limited | Professional & scientific | 1995 |
| T2T Solutions Ltd | Information & communication | 2021 |
| Tableau Creative Ltd | Arts & recreation | 2024 |
| Tabletop Gaming Cafe Ltd | Hospitality | 2025 |
| TADAS888 Ltd | Transport & logistics | 2016 |
| Tafadzwa Care Limited | Health & social care | 2019 |
| Tagpilot Ltd | Manufacturing | 2026 |
| Tally Accounting & Bookkeeping Limited | Professional & scientific | 2019 |
| Tamnim Limited | Information & communication | 2015 |
| Tango TEN Media Ltd | Professional & scientific | 2020 |
| Tanisha Beds Ltd | Hospitality | 2019 |
| Tanjil Ltd | Hospitality | 2016 |
| Tanker Rent UK Limited | Administrative & support | 2002 |
| Tara Moore Limited | Professional & scientific | 2014 |
| Target Homes Investments Ltd | Real estate | 2021 |
| Taskspace Limited | Construction | 2012 |
| Tate B G Limited | Professional & scientific | 2009 |
| Tate Business Group Ltd | Wholesale & retail | 1988 |
| Tate Consumables Ltd | Professional & scientific | 2009 |
| Tavistock Mews Management Company Limited | Households | 2003 |
| Tax-Guru | Professional & scientific | 2019 |
| Tax-Guru Partners LLP | | 2024 |
| Taylor Farm Holdings Limited | Professional & scientific | 2020 |
| Taylor Made Props Ltd | Information & communication | 2018 |
| Taylor Tech Group Ltd | Administrative & support | 2016 |
| Taylormade Drinks Ltd | Wholesale & retail | 2026 |
| TBJ Property Ltd | Real estate | 2023 |
| TC Electrical Ltd | Construction | 2021 |
| TC Infosec Limited | Information & communication | 2019 |
| Tcav Associates Limited | Administrative & support | 2017 |
| Tcrn Ltd | Hospitality | 2023 |
| TD Films Limited | Information & communication | 2026 |
| TDB Property Limited | Real estate | 2023 |
| Tebworth Van Sales Ltd | Wholesale & retail | 2020 |
| TEC1 Limited | Extraterritorial | 2001 |
| Tech Devs Ltd | Information & communication | 2018 |
| Techkey Limited | Information & communication | 2021 |
| Technical Futures Limited | Administrative & support | 1999 |
| Technical Resources International Limited | Administrative & support | 2003 |
| Techpro Autos Ltd | Wholesale & retail | 2022 |
| Techtool Solutions Ltd | Information & communication | 2024 |
| Temcoop Limited | Hospitality | 2026 |
| Temple Bespoke Limited | Construction | 2023 |
| Temsan Ltd | Wholesale & retail | 2021 |
| Tenmid Limited | Wholesale & retail | 2010 |
| Tenpu Teku Limited | Information & communication | 2016 |
| Terapeutico U.K. Ltd | Professional & scientific | 2018 |
| Terlings Park Management Company Limited | Households | 2014 |
| TF Dance Co CIC | Arts & recreation | 2023 |
| TFG Coaching Ltd | Arts & recreation | 2014 |
| TFP Properties Limited | Construction | 2015 |
| TFS Doors Limited | Construction | 2019 |
| TG CAN International Limited | Manufacturing | 2009 |
| TG CAN IP Limited | Professional & scientific | 2004 |
| TG Repairs Ltd | Other services | 2023 |
| Tharsan Service Ltd | Wholesale & retail | 2016 |
| THE Academy Management Company (Luton) Limited | Households | 2006 |
| THE Architech Club Ltd | Information & communication | 2019 |
| THE Arkley Rise Management Company Limited | Real estate | 2018 |
| THE Auldridge School of Gymnastics Limited | Education | 2025 |
| THE Baker BOY Bakery Ltd | Hospitality | 2025 |
| THE BBQ and Beer Bloke Ltd | Hospitality | 2023 |
| THE BBQ Kitchen Ltd | Hospitality | 2024 |
| THE Bedfordshire Butcher Ltd | Wholesale & retail | 2026 |
| THE Bedfordshire Mortgage Practice Limited | Financial services | 2003 |
| THE Bee's Knees Business Club CIC | Professional & scientific | 2022 |
| THE Black Horse Hotel (LB) Ltd | Hospitality | 2024 |
| THE Black Horse PUB (LB) Ltd | Hospitality | 2024 |
| THE Black Lion Inn (LB) Limited | Hospitality | 2013 |
| THE Boat Shop (MK) Ltd | Manufacturing | 2014 |
| THE Botanical Haberdashery Ltd | Wholesale & retail | 2022 |
| THE Bottle House Ltd | Wholesale & retail | 2022 |
| THE Brand Garden Limited | Professional & scientific | 2005 |
| THE Buddy Fernandez Card Company Ltd | Information & communication | 2012 |
| THE Candy Coven Ltd | Wholesale & retail | 2024 |
| THE Carnitarium Limited | Wholesale & retail | 2020 |
| THE Carriages (Chinnor) Management Company Limited | Households | 2017 |
| THE Cedars Residents Limited | Real estate | 1997 |
| THE Chimney Sweep Co. Ltd | Administrative & support | 2024 |
| THE Chocolate Gift Company Limited | Extraterritorial | 2017 |
| THE Click Collective Group Ltd | Professional & scientific | 2025 |
| THE Collective Design UK Limited | Administrative & support | 2007 |
| THE Complete Presenter Ltd | Professional & scientific | 2003 |
| THE Cook Partnership Limited | Real estate | 1999 |
| THE Cost of Doing Nothing Ltd | Wholesale & retail | 2025 |
| THE Cottage LB Ltd | Hospitality | 2023 |
| THE Croft (Liscombe) Management Company Limited | Households | 2019 |
| THE Crux Agency Ltd | Professional & scientific | 2021 |
| THE CUE and Arrow Ltd | Hospitality | 2024 |
| THE CUT Flower Collective Ltd | Other services | 2021 |
| THE Denes Laundrette Limited | Other services | 2019 |