| T M Walls & Ceilings Ltd | Construction | 2015 |
| T W Creative Homes Ltd | Construction | 2022 |
| T. Golding Contractors Limited | Other services | 2012 |
| T.F. Manor Construction Limited | Construction | 2017 |
| T.H. Screeding Limited | Construction | 2014 |
| T3 Productions Limited | Information & communication | 2023 |
| Tagalong Baby Ltd | Wholesale & retail | 2025 |
| Talent Spring Limited | Administrative & support | 2019 |
| Talking Elephants Limited | Arts & recreation | 2009 |
| Tamarise Limited | Real estate | 1998 |
| Tanglewood Court Limited | Households | 1999 |
| Tanza House Publishers Ltd | Information & communication | 2021 |
| Taormina Ltd | Hospitality | 2024 |
| Target Building Services Ltd | Other services | 2016 |
| Target Electrical Ltd | Construction | 2022 |
| Tarrington Properties Ltd | Real estate | 2006 |
| Tartan Plumbing Ltd | Construction | 2026 |
| Tas&Jem Ltd | Other services | 2024 |
| Tate Rose Consultancy Ltd | Professional & scientific | 2024 |
| Tavistock Road (Flats) Management Limited | Households | 1975 |
| Tax Moves Recruitment Limited | Administrative & support | 2025 |
| Taxtical Solution Ltd | Professional & scientific | 2023 |
| Taylor Turner Ltd | Other services | 2025 |
| Taylorroberts &Co Ltd | Professional & scientific | 2022 |
| TC7 Holdings Limited | Real estate | 2026 |
| TD Heating Services Limited | Construction | 2019 |
| TDH Roofing Limited | Construction | 2021 |
| TDS Marine Ltd | Manufacturing | 2021 |
| Techado Ltd | Administrative & support | 2022 |
| Tecpro Property Developments Ltd | Professional & scientific | 2021 |
| TEK a Trade Ltd | Extraterritorial | 2025 |
| Telescope Investing Ltd | Information & communication | 2021 |
| Teleview Group Ltd | Financial services | 2025 |
| Telia Investments Ltd | Financial services | 2026 |
| TEN Sixty Limited | Transport & logistics | 2010 |
| TEO Consulting Engineers Ltd | Professional & scientific | 2012 |
| Terra Delta Limited | Professional & scientific | 2022 |
| Thaiteas Ltd | Wholesale & retail | 2025 |
| Thames Construction Group Limited | Administrative & support | 2024 |
| Thames Court Kent Limited | Real estate | 2014 |
| Thames Demolition Limited | Construction | 2002 |
| Thames Valley Painters Ltd | Construction | 2025 |
| Thanet House Ltd | Health & social care | 2026 |
| THE Amazing Grace Church | Other services | 2009 |
| THE Amin Group Limited | Health & social care | 2018 |
| THE Apostolic Faith Mission UK Ltd | Other services | 2001 |
| THE Ashbrook Partnership LLP | | 2014 |
| THE Beeches Management (Sidcup) Limited | Households | 2017 |
| THE Bespoke Framer Limited | Other services | 2022 |
| THE Black Card Concierge Limited | Administrative & support | 2020 |
| THE Body Blueprint Limited | Arts & recreation | 2012 |
| THE Bonafide Group Ltd | Other services | 2022 |
| THE Changing Room With Hypnotherapy Ltd | Other services | 2023 |
| THE Cheeky Edit Company Ltd | Information & communication | 2003 |
| THE Creation LAB Limited | Information & communication | 2007 |
| THE Dharma Medical Group Ltd | Financial services | 2017 |
| THE Elms (Sidcup) RTM Company Limited | Households | 2025 |
| THE Escxpe Plan Ltd | Professional & scientific | 2024 |
| THE Excell Partnership LLP | | 2009 |
| THE Galopp Syndicate Limited | Arts & recreation | 2014 |
| THE Giant Snow Globe Ltd | Administrative & support | 2010 |
| THE Grange Residents RTM Company Ltd | Households | 2016 |
| THE Hoskins Management Company Limited | Administrative & support | 1997 |
| THE House of Wellness Group Ltd | Other services | 2025 |
| THE Image LAB London Ltd | Professional & scientific | 2017 |
| THE Imperative Group Limited | Extraterritorial | 2007 |
| THE Lawn Transformers Ltd | Administrative & support | 2012 |
| THE Lifeline Counselling Ltd | Health & social care | 2019 |
| THE Little Clipper Ltd | Other services | 2024 |
| THE London Mews Company Limited | Extraterritorial | 2005 |
| THE Millwood Mortgage Company Ltd | Financial services | 2025 |
| THE New Park View Right to Manage Company Limited | Households | 2017 |
| THE Oaks (Sidcup) RTM Company Limited | Households | 2020 |
| THE Oval Catering Limited | Hospitality | 2011 |
| THE Panna Partnership Ltd | Information & communication | 2017 |
| THE RIB Rack BBQ Company Ltd | Hospitality | 2025 |
| THE Services People Ltd | Administrative & support | 2020 |
| THE Skin Investment Clinic Bexley Ltd | Health & social care | 2026 |
| THE Souvlaki Truck UK Ltd | Hospitality | 2025 |
| THE Unique Ornament Ltd | Education | 2023 |
| THE Voice of Women International Initiative Limited | Administrative & support | 2017 |
| THE Wave Group Limited | Extraterritorial | 2025 |
| THE Way IT IS Limited | Wholesale & retail | 2020 |
| Therapy With Michelle Ltd | Other services | 2026 |
| Thimble Dare Limited | Extraterritorial | 2005 |
| Thind Advice Limited | Professional & scientific | 2012 |
| Think Advertising Limited | Professional & scientific | 1992 |
| Think Cloud Ltd | Professional & scientific | 2022 |
| Think Visual Communications Limited | Manufacturing | 2003 |
| Thishwin Ltd | Wholesale & retail | 2025 |
| Thomas & Dessain UK Limited | | 2000 |
| Thomas Ward Limited | Households | 2011 |
| Threadbare Limited | Administrative & support | 2009 |
| Three Keys Properties Limited | Real estate | 1994 |
| Through the Wall Ltd | Professional & scientific | 2019 |
| Tier 4 FM Consulting Limited | Professional & scientific | 2015 |
| Tikva Digital Ltd | Information & communication | 2025 |
| Timber Craft Building Services Ltd | Construction | 2024 |
| Timber Flooring Co. Ltd | Construction | 2017 |
| Timber Worx LDN Ltd | Construction | 2025 |