| Studio LV Ltd | Professional & scientific | 2019 |
| Studyelite Ltd | Education | 2026 |
| Sugablue Limited | Wholesale & retail | 2023 |
| Sukhoi Logistics Ltd | Transport & logistics | 2026 |
| Summers Superstars Projects CIC | Arts & recreation | 2025 |
| Super N Nanny Ltd | Administrative & support | 2024 |
| Supernatural Samantha Ltd | Manufacturing | 2025 |
| Supreme Parts Limited | Wholesale & retail | 2025 |
| Supthara Limited | Other services | 2024 |
| Surikat Ltd | Manufacturing | 2021 |
| SUSHI360 Limited | Hospitality | 2025 |
| Suzayu Limited | Real estate | 2024 |
| Swift House Management Company Limited | Households | 1981 |
| Swipeshop Ltd | Wholesale & retail | 2025 |
| Syed Telecoms Ltd | Wholesale & retail | 2026 |
| Sygnus Consultants Limited | Administrative & support | 2023 |
| Synergy Strategies Ltd | Information & communication | 2019 |
| Syswize Consulting Ltd | Information & communication | 2025 |
| Syswize Limited | Information & communication | 2015 |
| T & J N Ltd | Construction | 2020 |
| T&T Lettings Ltd | Real estate | 2023 |
| T.L.Properties (South East) Ltd | Real estate | 2022 |
| TA General Practice Ltd | Health & social care | 2024 |
| Tagic Limited | Real estate | 2023 |
| Tahweel Communications Limited | Information & communication | 2009 |
| TAI SIG Tech Ltd | Construction | 2025 |
| Taiwoduro Ltd | Construction | 2018 |
| Talem Law Limited | Professional & scientific | 2017 |
| Talent Management Service Limited | Administrative & support | 2025 |
| Taliya Ltd | Other services | 2023 |
| Tanesh Ltd | Information & communication | 2019 |
| Tanesh Properties Ltd | Real estate | 2021 |
| Tani Brickwork Limited | Construction | 2023 |
| Tanya Consulting Limited | Health & social care | 2024 |
| TAO Construction Ltd | Construction | 2019 |
| Tarab Management Ltd | Real estate | 2019 |
| Taylors Legal Limited | Professional & scientific | 2016 |
| TB Realty Limited | Real estate | 2014 |
| TBS Carpentry Ltd | Construction | 2014 |
| TDT Enev Electrical Ltd | Construction | 2024 |
| TEACHERS4ALL Ltd | Education | 2014 |
| Teatech Global Ltd | Information & communication | 2024 |
| Techclimb Technologies Limited | Information & communication | 2025 |
| Techo IT Solutions Ltd | Information & communication | 2016 |
| TECHSEARCH360 Ltd | Administrative & support | 2024 |
| Teddy.Rails Ltd | Construction | 2025 |
| Teedee & Family Property Limited | Real estate | 2025 |
| Teewhy Ventures Limited | Wholesale & retail | 2017 |
| Tegh London Limited | Real estate | 2014 |
| Temple Street Food Limited | Wholesale & retail | 2024 |
| Teneton Homes Limited | Real estate | 2024 |
| TEQ Media Ltd | Information & communication | 2023 |
| Tereko Investments Limited | Households | 2023 |
| Tereko Ltd | Construction | 2017 |
| Ternobuild Line Ltd | Construction | 2026 |
| Thames Bricks Ltd | Wholesale & retail | 2015 |
| Thamesgate Properties Ltd | Real estate | 2025 |
| Thamesleigh (UK) Limited | Administrative & support | 2012 |
| THE Adams Family Estate Limited | Real estate | 2022 |
| THE Altin Heritage Caviar House Ltd | Hospitality | 2026 |
| THE Beauty Terrace Limited | Real estate | 2002 |
| THE Business Excellence Academy Limited | Professional & scientific | 2024 |
| THE Cheer Agent Ltd | Administrative & support | 2025 |
| THE Chigwell Marquees Ltd | Hospitality | 2017 |
| THE Community Action Team Limited | Education | 2001 |
| THE Cornershop Brewing Company Ltd | Manufacturing | 2022 |
| THE Deanston 1203 Ltd | Real estate | 2023 |
| THE Designers Studio London Limited | Wholesale & retail | 2015 |
| THE DRY Cleaning Centre & Alterations Ltd | Other services | 2026 |
| THE Good AI Project Ltd | Information & communication | 2026 |
| THE Henry Property Holdings Ltd | Households | 2019 |
| THE Independent ZM Ltd | Information & communication | 2025 |
| THE Investment Recruitment Hub Ltd | Administrative & support | 2023 |
| THE Kunishka Productions Ltd | Information & communication | 2020 |
| THE London Baking Company Limited | Real estate | 1995 |
| THE London Education Group Ltd | Education | 2025 |
| THE London Terrarium Company Limited | Agriculture & fishing | 2018 |
| THE Madjuicer House Ltd | Hospitality | 2025 |
| THE Number 4 YOU Ltd | Other services | 2014 |
| THE Padda Perspective Ltd | Professional & scientific | 2025 |
| THE Q Building Management Company Limited | Households | 2002 |
| THE Sanding Company Limited | Construction | 2011 |
| THE Stroud Family LLP | | 2022 |
| Therapeast Ltd | Health & social care | 2022 |
| Theydon Garage Ltd | Wholesale & retail | 2017 |
| Thilaga Memorial Limited | Education | 2023 |
| Thinkspire Global Education Limited | Administrative & support | 2026 |
| Thirty Third Degree Ltd | Other services | 2026 |
| This IS London Limited | Information & communication | 2019 |
| This IS London Magazine Limited | Information & communication | 1981 |
| This IS London Tickets Limited | Professional & scientific | 2001 |
| THM Redbridge Limited | Wholesale & retail | 2014 |
| Three Brothers Property Investor Ltd | Real estate | 2026 |
| Thriya Limited | Information & communication | 2025 |
| TIC Drylining&Rendering Ltd | Construction | 2020 |
| Timber Mate Carpentry Limited | Construction | 2019 |
| Tingling Travel Ltd | Transport & logistics | 2021 |
| Titan TOW and Recovery Ltd | Wholesale & retail | 2025 |
| TLA Property Group Limited | Real estate | 2022 |
| TM Groundwork's Ltd | Construction | 2024 |