| Toby Stone Tree Surgeon Ltd | Agriculture & fishing | 2021 |
| Tobys Healthcare Limited | Health & social care | 2018 |
| Tocada IT Ltd | Information & communication | 2014 |
| Toddbrook House Limited | Households | 2012 |
| TOF Publishing Ltd | Professional & scientific | 2021 |
| Toff Group Limited | Administrative & support | 2006 |
| Together IS Better Ltd | Construction | 2019 |
| Togy Portland Cafe Limited | Hospitality | 2012 |
| Toker & Co Limited | Professional & scientific | 2025 |
| Tokozi Ltd | Wholesale & retail | 2025 |
| TOL Group Limited | Financial services | 2017 |
| Toleka Events Ltd | Information & communication | 2025 |
| Toletti Limited | Wholesale & retail | 2020 |
| Tollykolly Nominees Ltd | Administrative & support | 2021 |
| TOM Russell Limited | Real estate | 2012 |
| Tom-Bus Ltd | Transport & logistics | 2023 |
| Tom-Nat Limited | Professional & scientific | 2015 |
| Tomelik Limited | Information & communication | 2020 |
| Tommy Mac's Flooring Ltd | Wholesale & retail | 2019 |
| Tommy Trans Service Ltd | Transport & logistics | 2023 |
| Tomorrow's Tourism Ltd | Professional & scientific | 2017 |
| Tomscabin Limited | Wholesale & retail | 2010 |
| Tonale Limited | Financial services | 2022 |
| Tonbridge Delivery Limited | Hospitality | 2025 |
| Tonefinal Limited | Real estate | 1999 |
| Tonga Mboka Construction Ltd | Construction | 2023 |
| Tongda Trading Ltd | Administrative & support | 2016 |
| Tonis One Ltd | Construction | 2017 |
| Tonu Partners Limited | Professional & scientific | 2024 |
| Tony and Peter's Ltd | Other services | 2026 |
| Tony Nails 6 Ltd | Other services | 2026 |
| Tony Sinclair Limited | Construction | 2022 |
| Tony Stitt Fitness Limited | Arts & recreation | 2016 |
| Tonyambi Property Limited | Construction | 2025 |
| Tool EYE Ltd | Information & communication | 2026 |
| Toolsforhumans Ltd | Information & communication | 2023 |
| Top 2 Bottom London Services Ltd | Transport & logistics | 2018 |
| Top Accountants Ltd | Professional & scientific | 2022 |
| Top at Home Ltd | Health & social care | 2024 |
| Top Brush Painters Ltd | Construction | 2023 |
| Top Cat Clothing Ltd | Wholesale & retail | 2015 |
| Top Choice Mini Market Ltd | Wholesale & retail | 2025 |
| Top Class Tiling & Construction Ltd | Construction | 2017 |
| Top Gear Cars Ltd | Transport & logistics | 2012 |
| Top Gear Motors Limited | Wholesale & retail | 2005 |
| Top Grades Tuition Ltd | Education | 2025 |
| Top Links Connect Ltd | Administrative & support | 2012 |
| Top Quality Shoe Repair and Key Cutting Ltd | Other services | 2025 |
| Top Service (UK) Ltd | Other services | 2014 |
| Top to Bottom Building & Joinery Limited | Manufacturing | 2018 |
| Top Window London Ltd | Construction | 2021 |
| Topasset Limited | | 1980 |
| Topcare Network | Health & social care | 2004 |
| Topcular Ltd | Hospitality | 2023 |
| Topfix Plumbing Group Ltd | Construction | 2026 |
| Topgbugatti Ltd | Wholesale & retail | 2026 |
| Topline Automotive Group Ltd | Wholesale & retail | 2026 |
| Topmax Ltd | Hospitality | 1996 |
| Topmove Estate Agents Ltd | Real estate | 2014 |
| Tops Croydon Limited | Hospitality | 2025 |
| Tops Global Ltd | Transport & logistics | 2021 |
| Topscollections Ltd | Wholesale & retail | 2024 |
| Topsyevent Limited | Hospitality | 2024 |
| Topwash 4 Ltd | Administrative & support | 2015 |
| Torbay Charts Limited | Information & communication | 2023 |
| Tore.Mb Ltd | Professional & scientific | 2024 |
| Torg Developments Ltd | Real estate | 2021 |
| Torgbarn Developments Ltd | Real estate | 2023 |
| Toronet Limited | Hospitality | 2006 |
| Torquay Devon Lease Ltd | Hospitality | 2026 |
| Torque Reaction Limited | Wholesale & retail | 2010 |
| Torus Property Services Limited | Financial services | 2024 |
| Torwood House Whyteleafe Freehold Limited | Other services | 2003 |
| Tosb Services Limited | Hospitality | 2022 |
| Toselands Limited | Other services | 2016 |
| Tosh RTM Company Ltd | Households | 2022 |
| Tosoma Limited | Information & communication | 2019 |
| Tostevin Properties Limited | Construction | 2019 |
| Total Auto Care (London) Limited | Wholesale & retail | 2013 |
| Total Facilities Services Limited | Administrative & support | 2024 |
| Total Ground Management Ltd | Other services | 2021 |
| Total Integrated Pest Management Ltd | Administrative & support | 2016 |
| Total Media 20 Limited | Information & communication | 2021 |
| Total Sealants Limited | Construction | 2012 |
| Total Security Solutions London Limited | Administrative & support | 2021 |
| Total Viva W1 Limited | Professional & scientific | 2017 |
| Totally Belts Ltd | Wholesale & retail | 2018 |
| Totempole Limited | Households | 2008 |
| Totheminute Ltd | Transport & logistics | 2026 |
| Touch Care Ltd | Health & social care | 2022 |
| Touch Luxury Ltd. | Administrative & support | 2017 |
| Touching Lives Support Services Ltd | Health & social care | 2025 |
| Touchlinefacts Ltd | Professional & scientific | 2026 |
| Tough Industries Ltd | Administrative & support | 2024 |
| Tough Mary's Bakehouse Ltd | Manufacturing | 2016 |
| Tower Bridge Mews Management Company Limited | Households | 2024 |
| Tower Cleaning Services Limited | Other services | 2002 |
| Tower Grange Management Company Limited | Households | 1997 |
| Tower Hill Construction Limited | Construction | 2011 |
| Tower Wharf Apartments Management Company Limited | Households | 2010 |