| T5 Ashmor Ltd | Financial services | 2025 |
| Taac Trading Ltd | Hospitality | 2022 |
| TAB Media Limited | Information & communication | 2023 |
| Tablebook ME Limited | Administrative & support | 2010 |
| Tacadi Property Ltd | Real estate | 2022 |
| TAH Accounting Limited | Professional & scientific | 2018 |
| Takeaway Fever Ltd | Hospitality | 2021 |
| Takeley Cars Limited | Wholesale & retail | 2011 |
| Talbot Place Management Co Ltd | Real estate | 2013 |
| Talent HQ Ltd | Administrative & support | 2013 |
| Talus Solutions Ltd | Construction | 2013 |
| Tamworth Road Management Limited | Households | 1989 |
| Tanever Logistics Limited | Transport & logistics | 2024 |
| Tangled Feet Limited | Arts & recreation | 2004 |
| Tanks Pumps & Pipeworks Limited | Construction | 2024 |
| Tapocketa Ltd | Information & communication | 2021 |
| Taralga Contracting Limited | Construction | 2018 |
| Target Connections Ltd | Manufacturing | 2024 |
| Tasktron Limited | Manufacturing | 1989 |
| Taste BX Limited | Hospitality | 2023 |
| Tastie Bites Ltd | Hospitality | 2023 |
| Tavistock House (Great Ashby) Management Company Limited | Households | 2004 |
| Tayfen Court Management Company Limited | Real estate | 2024 |
| Tayfields Management Company Limited | Real estate | 2021 |
| Taylor Made Cars & Classics Limited | Wholesale & retail | 2023 |
| Taylor Ryan Limited | Real estate | 1979 |
| TBB Electrical & Security Group Limited | Professional & scientific | 1997 |
| TC Soils and Aggregates Ltd | Other services | 2024 |
| Tcplumbingandbuilding Ltd | Manufacturing | 2024 |
| TD Trades Ltd | Professional & scientific | 2022 |
| TDC Tree Care Ltd | Administrative & support | 2017 |
| TDM Williams Holdings Limited | Extraterritorial | 2018 |
| TDR East Ltd | Other services | 2024 |
| Team Build Lettings Ltd | Real estate | 2021 |
| Team Build Property Development Ltd | Construction | 2021 |
| Team Dillon Coaching Limited | Wholesale & retail | 2008 |
| Techmed Services Limited | Construction | 2006 |
| Techniquest UK Limited | Professional & scientific | 1999 |
| Tect Risk Services Ltd | Financial services | 2022 |
| TED Touring Services Ltd | Arts & recreation | 2016 |
| Teju Property Limited | Real estate | 2024 |
| Tela Property Ltd | Real estate | 2023 |
| Temple Estate Management Company Limited | Households | 1982 |
| Temple Meridian Holdco Limited | Professional & scientific | 2018 |
| Temple Meridian Limited | Real estate | 2004 |
| TEN72 Ltd | Transport & logistics | 2024 |
| Tenacity Business Solutions Limited | Professional & scientific | 2017 |
| Tendo Media Limited | Professional & scientific | 2026 |
| Tension Release Ritual Co Limited | Administrative & support | 2025 |
| Tenterfield House (Welwyn) Freeholders Limited | Households | 2014 |
| Tergo Limited | Hospitality | 2025 |
| Teros Properties Limited | Real estate | 2025 |
| Terredor Ltd | Real estate | 2017 |
| Terredor One Ltd | Real estate | 2020 |
| TG Residential Property Ltd | Real estate | 2020 |
| TGH Chauffeurs Ltd | Transport & logistics | 2014 |
| TGL Group Holdings Limited | Financial services | 2025 |
| TGR Agri (UK) Ltd | Agriculture & fishing | 1999 |
| Thackery House Management Company Limited | Households | 1989 |
| Thai JAI Boxing Ltd | Wholesale & retail | 2026 |
| THE 355 Management Company Limited | Real estate | 1987 |
| THE Abbotts Management Company Limited | Administrative & support | 2009 |
| THE Accounts Company (2005) Limited | Professional & scientific | 2005 |
| THE Add-Vantage Adhd Support Services CIC | Other services | 2023 |
| THE Alcohol Free Brewing Company Ltd | Manufacturing | 2019 |
| THE Arborist Academy UK Ltd | Agriculture & fishing | 2025 |
| THE Auto Wholesaler Limited | Wholesale & retail | 2026 |
| THE AV Farm Limited | Wholesale & retail | 2017 |
| THE Barking LOT Ltd | Other services | 2022 |
| THE Beach House Agency Limited | Wholesale & retail | 2013 |
| THE Big Knights Limited | Information & communication | 2020 |
| THE Big Media House Limited | Information & communication | 2011 |
| THE Boundary Management Company (Little Berkhamsted) Limited | Real estate | 2005 |
| THE Box Cleaning Company Ltd | Administrative & support | 2012 |
| THE Bridgewater House RTM Company Limited | Households | 2005 |
| THE Car Wash Company (Corporate) Limited | Administrative & support | 2013 |
| THE Car Wash Company (Products) Ltd | Administrative & support | 2013 |
| THE Career Gym Limited | Administrative & support | 2008 |
| THE Carwash Company (Franchise) Limited | Administrative & support | 2018 |
| THE Carwash Company (GB) Ltd | Administrative & support | 2009 |
| THE Carwash Company (IP) Limited | Other services | 2019 |
| THE Castle Snooker & Social Club Ltd | Arts & recreation | 2008 |
| THE Charlotte Court (London) RTM Company Limited | Households | 2016 |
| THE Chitchat Club Ltd | Information & communication | 2026 |
| THE Cihans Ottoman Barber Shop Limited | Other services | 2015 |
| THE Circle (RTM) Company Ltd | Households | 2006 |
| THE Clay Store Limited | Wholesale & retail | 2020 |
| THE Collective Dancewear Limited | Wholesale & retail | 2021 |
| THE Complete Cladding Company Limited | Construction | 2005 |
| THE Counterpoint Group Ltd | Financial services | 2026 |
| THE Courtyard Arts and Community Centre | Education | 1995 |
| THE Cream Room Recording Studio Ltd | Information & communication | 2009 |
| THE Crochet Lounge Limited | Administrative & support | 2012 |
| THE Cross FOX Brewery Ltd | Manufacturing | 2024 |
| THE Cutting Room (Herts) Ltd | Other services | 2006 |
| THE Cypher Club Ltd | Administrative & support | 2025 |
| THE Dawghouse Doggy Daycare Ltd. | Other services | 2017 |
| THE Deep House Hertford Ltd | Other services | 2024 |
| THE Design Subscription Ltd | Information & communication | 2025 |
| THE Disobedient Scapegoat Ltd | Hospitality | 2024 |