| Stonesby Mews RTM Company Limited | Households | 2023 |
| Studio Augustii Limited | Professional & scientific | 2005 |
| Studio Belvedere Ltd | Other services | 2020 |
| Studio CK Ltd | Information & communication | 2024 |
| STUDIO120 Barbering Ltd | Other services | 2021 |
| Style Salon 41 Limited | Other services | 2013 |
| Suay Skin Ltd | Other services | 2025 |
| Suay Skincare London Ltd | Other services | 2025 |
| Subside Rock Ltd | Wholesale & retail | 2025 |
| Succour Consulting Limited | Other services | 2021 |
| Sulwe Limited | Health & social care | 2023 |
| Suninsulae Festival Limited | Arts & recreation | 2021 |
| Sunny Dolphins Ltd | Extraterritorial | 2020 |
| Sunshine Finops Ltd | Professional & scientific | 2024 |
| Supaglazing Limited | Manufacturing | 1981 |
| Supreva Construction Limited | Construction | 2025 |
| Suralex Estates Limited | Construction | 1970 |
| Sustainup Ltd | Wholesale & retail | 2025 |
| Swan Healthcare (UK) Limited | Health & social care | 2012 |
| Swinny's Sweets Ltd | Wholesale & retail | 2024 |
| Switchgear Electrical Ltd | Construction | 2022 |
| SWP Care Limited | Real estate | 2024 |
| SXG Management Limited | Administrative & support | 2003 |
| Syncdflow Ltd | Information & communication | 2026 |
| Syriz Consulting Limited | Information & communication | 2023 |
| T.B. Aviation Limited | Professional & scientific | 1991 |
| T.M. & Co Limited | Administrative & support | 2011 |
| Taaleel London Coffee Shop Ltd | Hospitality | 2025 |
| Tabi Celebrations Ltd | Hospitality | 2020 |
| Tailored Technologies Ltd | Wholesale & retail | 2025 |
| Take Care Labour Supplies Limited | Construction | 2019 |
| Tauren Ltd | Real estate | 2024 |
| Tauri Limited | Health & social care | 2013 |
| Tauri Properties Limited | Real estate | 2020 |
| Taxacute Limited | Professional & scientific | 2014 |
| Taxtab Ltd | Professional & scientific | 2008 |
| TCK Construction Limited | Construction | 2006 |
| Tea Crate Construction Ltd | Construction | 2014 |
| TEC Motorcycle Ltd | Wholesale & retail | 2024 |
| Techlotus Limited | Information & communication | 2023 |
| Technical Authors Ltd | Professional & scientific | 2024 |
| Techsolvers Ltd | Information & communication | 2009 |
| Teejay Consulting Limited | Information & communication | 2012 |
| Tekknows Solutions Ltd | Information & communication | 2023 |
| Teodor&Son Ltd | Wholesale & retail | 2024 |
| Terrafirma BP Limited | Information & communication | 2024 |
| TGP Capital Ltd | Other services | 2021 |
| TGP International Limited | Professional & scientific | 2016 |
| Thames Wire Productions Limited(The) | Construction | 1980 |
| THE Alphamind Project Ltd | Education | 2021 |
| THE Barbers Yard Ltd | Other services | 2022 |
| THE Brand Atelier Global Ltd | Professional & scientific | 2021 |
| THE Bushey Brewery Company Limited | Manufacturing | 2014 |
| THE Cake Barista Ltd | Hospitality | 2026 |
| THE Callis House Ltd. | Administrative & support | 2016 |
| THE Cloisters (Bushey) RTM Company Limited | Households | 2024 |
| THE Cocktail House Limited | Hospitality | 2017 |
| THE Concierge 4U Club Ltd | Transport & logistics | 2026 |
| THE Devonshire Bushey Ltd | Extraterritorial | 2014 |
| THE Diners Inn 1 Limited | Other services | 2016 |
| THE Gaff 1 Limited | Hospitality | 2018 |
| THE Golz Family 2 Ltd | Real estate | 2020 |
| THE Golz Family Ltd | Financial services | 2020 |
| THE Good Energy MAN Limited | Administrative & support | 2026 |
| THE Good Give 2025 Ltd | Information & communication | 2025 |
| THE Good Landlord Co Limited | Real estate | 2026 |
| THE Great Banquet Partners Limited | Other services | 2025 |
| THE Greek Indian Ltd | Hospitality | 2024 |
| THE Hairdressing and Beauty Equipment Company Ltd | Other services | 2019 |
| THE LAB21 Ltd | Health & social care | 2020 |
| THE Langos Factory Ltd | Hospitality | 2018 |
| THE Lansdowne Bars Limited | Hospitality | 2006 |
| THE Lawncare Company (Herts) Ltd | Administrative & support | 2021 |
| THE Lgcs Consultancy Ltd | Professional & scientific | 2025 |
| THE London Global Digital Dental LAB Ltd | Health & social care | 2024 |
| THE London Global Medical Ltd | Health & social care | 2019 |
| THE Maverick Consultancy Ltd | Wholesale & retail | 2006 |
| THE Motherland Food Ltd | Wholesale & retail | 2022 |
| THE Mumbai Sandwich Co Limited | Hospitality | 2017 |
| THE National Independent Removals Industry Inspectorate Limited | Administrative & support | 1997 |
| THE Pink Pixie Crafts Ltd | Wholesale & retail | 2025 |
| THE Pleasure Home Limited | Information & communication | 2003 |
| THE R M Design Partnership Limited | Professional & scientific | 1995 |
| THE Scottish Guild of Removers & Storers Limited | Extraterritorial | 2004 |
| THE Secret Garden Cafe Coffee Ltd | Hospitality | 2026 |
| THE Simon Charles Group Ltd | Professional & scientific | 2024 |
| THE Slipstream Collection Ltd | Real estate | 2026 |
| THE Tax Whisperers Limited | Professional & scientific | 2023 |
| THE Together Plan Limited | Health & social care | 2013 |
| THE Tula Trust Limited | Administrative & support | 2002 |
| THE Water Filtration Holding Company Limited | Financial services | 2024 |
| Thebesttrans Ltd | Transport & logistics | 2023 |
| Therapist London Ltd | Health & social care | 2023 |
| Thind Bathrooms and Kitchens Ltd | Construction | 2024 |
| Thind Construction London Ltd | Construction | 2023 |
| Think OR Swim Ltd | Information & communication | 2018 |
| Thinking Content Ltd | Manufacturing | 2025 |
| Thrivve LLP | | 2025 |
| Tiffany & Gardner Ltd | Education | 2024 |
| Tikka Beer Limited | Wholesale & retail | 2002 |