| Together WE Build Limited | Other services | 2019 |
| Together WE Count Limited | Professional & scientific | 2015 |
| Together WE Home Limited | Real estate | 2023 |
| Together WE Invest Limited | Real estate | 2023 |
| Togetherltd Ltd | Households | 2025 |
| Toilets, Taps & Sinks Ltd | Construction | 2015 |
| Toir Limited | Hospitality | 2020 |
| Toivda Ltd | Hospitality | 2020 |
| Tojir Ltd | Water & waste | 2025 |
| Tokasi Limited | Financial services | 2024 |
| Tokenmarket Limited | Financial services | 2017 |
| Tokensfor Limited | Manufacturing | 2004 |
| Toko Recordings Limited | Information & communication | 2021 |
| TOL Construction Ltd | Construction | 2023 |
| Toland Properties Limited | Real estate | 2024 |
| Toleen Alqurashi Limited | Manufacturing | 2023 |
| Toliz Enterprises Limited | Wholesale & retail | 2013 |
| Toljok Limited | Health & social care | 2015 |
| Tolson Court Management Company Limited | Households | 2001 |
| TOM Armes Creative Ltd | Administrative & support | 2020 |
| TOM Conolly Projects Ltd | Construction | 2025 |
| TOM Cottam Limited | Information & communication | 2022 |
| TOM Dronfield Landscapes Limited | Administrative & support | 2020 |
| TOM Duncan Limited | Professional & scientific | 2018 |
| TOM Etherington Studio Limited | Professional & scientific | 2022 |
| TOM Flavell Furniture Limited | Wholesale & retail | 2014 |
| TOM Grice Ltd | Information & communication | 2024 |
| TOM Hickox Limited | Information & communication | 2016 |
| TOM Macklin Studio Limited | Arts & recreation | 2015 |
| TOM Robbins Production Ltd | Arts & recreation | 2024 |
| TOM Robinson Business Services Limited | Administrative & support | 2020 |
| TOM Speight Music Limited | Information & communication | 2017 |
| Toma Taco Ltd | Hospitality | 2024 |
| Tomahawk Group Ltd | Real estate | 2017 |
| Tomas Woodward Holdings UK Ltd | Real estate | 2024 |
| Tomasz Idziak Ltd | Transport & logistics | 2014 |
| Tomes Estates Ltd | Real estate | 2021 |
| Tommy Ashby Publishing Limited | Information & communication | 2019 |
| Tommy Frank Boxing Academy Limited | Education | 2025 |
| Tommy H Investments Ltd | Real estate | 2024 |
| Tommy Security Ltd | Administrative & support | 2019 |
| Tommy Tinting Limited | Wholesale & retail | 2022 |
| Tommy's Motorhaus Ltd | Wholesale & retail | 2025 |
| Tommy's VEG Limited | Wholesale & retail | 2023 |
| Tomorrow IS Another Day Coffee Ltd | Hospitality | 2023 |
| Toneil Bricks Ltd | Wholesale & retail | 2025 |
| Tonias Place Ltd | Wholesale & retail | 2026 |
| Tonic House Studios Ltd | Information & communication | 2024 |
| Tonic Works Limited | Information & communication | 2018 |
| Tonik EU PTY Ltd | Extraterritorial | 2019 |
| Toniraloo Ltd | Transport & logistics | 2016 |
| Tonka Homes Ltd | Real estate | 2018 |
| Tonkie Ltd | Information & communication | 2018 |
| Tony Sherwoods Solutions Limited | Construction | 2019 |
| Tony's Kitchen Limited | Hospitality | 2022 |
| Took the Stairs Films Limited | Arts & recreation | 2024 |
| Tool and Steel Products Ltd | Professional & scientific | 2022 |
| Tool Steel Blanks Limited | Manufacturing | 2013 |
| Toolmakers Brewery Limited | Manufacturing | 2012 |
| Tools for ALL Trades Limited | Extraterritorial | 1943 |
| Tootbox Ltd | Manufacturing | 2015 |
| Tooth Comb Procurement Limited | Wholesale & retail | 2023 |
| Tooty Academy Ltd | Education | 2024 |
| Top Banana Theatre School Ltd | Arts & recreation | 2023 |
| Top BOY Boxing Centre CIC | Arts & recreation | 2026 |
| Top BOY Boxing Club Ltd | Arts & recreation | 2026 |
| Top Chopper UK Ltd | Other services | 2026 |
| Top Clicksuk Limited | Wholesale & retail | 2025 |
| Top CUT Barber S21 Limited | Other services | 2024 |
| Top CUT Barber South Ltd | Other services | 2024 |
| Top Fade Barber S13 Ltd | Other services | 2026 |
| Top GUY PUB Company Limited | Hospitality | 2023 |
| Top Level Snagging Ltd | Households | 2024 |
| Top Lines Catering Supplies Limited | Wholesale & retail | 1999 |
| Top Nail Salon Ltd | Other services | 2012 |
| Top Nails S1 Ltd | Other services | 2025 |
| Top Noodles Ltd | Hospitality | 2025 |
| Top of the Game Ltd | Administrative & support | 2026 |
| Top Property 4U Ltd | Real estate | 2025 |
| Top Rated Ltd | Wholesale & retail | 2018 |
| Top Shop Ecclesfield Limited | Wholesale & retail | 2025 |
| Top Shop S6 Ltd | Wholesale & retail | 2025 |
| Top Taste Take Away Limited | Hospitality | 2013 |
| Top TEN Golf Limited | Wholesale & retail | 1996 |
| Top Tier Accounting Limited | Professional & scientific | 2022 |
| Top Tier Plumbing and Heating Ltd | Construction | 2018 |
| Top Tier Tiles Ltd | Construction | 2025 |
| Top Tread Tyres Ltd | Wholesale & retail | 2005 |
| Top Warren Preservation Company Ltd | Households | 2024 |
| Topaz (NO.1) Management Company Limited | Households | 2007 |
| Topaz Homes Limited | Real estate | 2022 |
| Topaz HR Services Limited | Professional & scientific | 2010 |
| Topcleanz Ltd | Administrative & support | 2025 |
| Topgood TV Ltd | Information & communication | 2013 |
| Topham Accountants Ltd | Professional & scientific | 2023 |
| Topinvent Ltd | Wholesale & retail | 2015 |
| Topline Security Ltd | Administrative & support | 2025 |
| Topline Trading & Distribution Ltd | Wholesale & retail | 2022 |
| Topnb Limited | Wholesale & retail | 2025 |
| Topniq Properties Ltd | Real estate | 2023 |