| Swift Housing Solutions Ltd | Real estate | 2024 |
| Swift Jobs Ltd | Extraterritorial | 2014 |
| Swift Motorcycles Ltd | Wholesale & retail | 2026 |
| Swift Transit Limited | Transport & logistics | 2014 |
| Swift-Payuk Limited | Administrative & support | 2023 |
| Swight Cloud Ltd | Information & communication | 2025 |
| Swimming Pro Ltd | Education | 2022 |
| Swiss Cell U.K Limited | Wholesale & retail | 1989 |
| Swizzlaaz Limited | Manufacturing | 2026 |
| Swoop Entertainment Ltd | Hospitality | 2025 |
| Swypeuk Ltd | Wholesale & retail | 2024 |
| Sxiangmu Limited | Professional & scientific | 2018 |
| SY Holiday Business Travel Ltd | Administrative & support | 2014 |
| Syacys Ltd | Information & communication | 2012 |
| SYE Ltd | Wholesale & retail | 2017 |
| Syed Fiscal Solutions Ltd | Professional & scientific | 2017 |
| Syed Holdings Group Ltd | Financial services | 2024 |
| Sygnet Properties Ltd | Real estate | 2025 |
| Sygon Studios Ltd | Professional & scientific | 2023 |
| Sykara Ltd | Information & communication | 2025 |
| Sylutions Limited | Administrative & support | 2024 |
| Symbah Group Ltd | Information & communication | 2021 |
| Symplx Ltd | Information & communication | 2023 |
| Syms Group Ltd | Real estate | 2004 |
| SYNCHRO11 Global Ltd | Information & communication | 2024 |
| Syncsync Ltd | Information & communication | 2023 |
| Synel Industries (UK) Limited | Administrative & support | 1990 |
| Synergic Links Limited | Information & communication | 2007 |
| Synrgy Limited | Professional & scientific | 2013 |
| Synth Form Limited | Administrative & support | 2020 |
| Syntrax Music Publishing Limited | Information & communication | 2004 |
| System Capital Properties Ltd | Real estate | 2021 |
| Systematic Group Limited | Wholesale & retail | 2017 |
| Syvaré Capital Family & Partners Limited | Financial services | 2025 |
| SZ Smiles Ltd | Health & social care | 2022 |
| Szak Consultancy Ltd | Professional & scientific | 2023 |
| T & T Allen Motor Sales Ltd | Wholesale & retail | 2019 |
| T Allen Homes Ltd | Real estate | 2020 |
| T Allen Properties Ltd | Real estate | 2021 |
| T E M Consultancy Services Limited | Professional & scientific | 2011 |
| T G RAM (Homes) Limited | Construction | 2015 |
| T G RAM (Mill Hill BJJ) Limited | Real estate | 2018 |
| T G RAM Ltd | Construction | 2002 |
| T K Property & Services Ltd | Real estate | 2019 |
| T REX Technologies Ltd | Professional & scientific | 2014 |
| T Wright Group Limited | Financial services | 2017 |
| T&A Internationals Limited | Wholesale & retail | 2026 |
| T&E Property Services LLP | | 2018 |
| T&K Superstore Ltd | Wholesale & retail | 2023 |
| T&L Fuel Services Ltd | Wholesale & retail | 2012 |
| T&S Builders Service Ltd | Construction | 2019 |
| T&T Garage MOT Ltd | Professional & scientific | 2012 |
| T. Mcgee & Co. Limited | Professional & scientific | 2005 |
| T.A. Roberts Building Services Ltd | Construction | 2020 |
| T.B Fashion Ltd | Wholesale & retail | 2025 |
| TA Beauty and Fragrance Limited | Wholesale & retail | 2023 |
| TAA Software Ltd | Information & communication | 2017 |
| Taasmac Ltd. | Information & communication | 2021 |
| TAB Cleaning Service Limited | Administrative & support | 2025 |
| TAB Ventures Ltd | Wholesale & retail | 2025 |
| Taco - Time (SC) Limited | Hospitality | 2017 |
| Taco - Time Limited | Hospitality | 2018 |
| Taeja Construction Ltd | Construction | 2024 |
| Taff Werks Ltd | Wholesale & retail | 2020 |
| Taha Justice CIC | Professional & scientific | 2025 |
| Tailor Consultancy Ltd | Professional & scientific | 2023 |
| Tailored HR Solutions Limited | Administrative & support | 2025 |
| Tailored Technology Limited | Professional & scientific | 1989 |
| TAJ Protech Ltd | Transport & logistics | 2021 |
| Take a BOW Ltd | Arts & recreation | 2015 |
| Tally Tax Ltd | Professional & scientific | 2025 |
| Tama RA Events Designers Limited | Administrative & support | 2015 |
| Tamil Eelam National Ltd | Education | 2025 |
| Tanchev Ltd | Construction | 2024 |
| Tang Fang Trading Co., Ltd | Extraterritorial | 2021 |
| Tankers Holdco Limited | Transport & logistics | 2023 |
| Tanna's Kitchen Ltd | Wholesale & retail | 2020 |
| Tanning Salon LV Limited | Other services | 2023 |
| Tannvi Ltd | Wholesale & retail | 2025 |
| Tansow Technologies Ltd | Information & communication | 2012 |
| Tanvi Property Management Limited | Real estate | 2026 |
| TAP UK Construction Ltd | Construction | 2025 |
| TAP UK Construction Services Ltd | Construction | 2022 |
| Tapas Bar Limited | Hospitality | 2013 |
| Tapas Property Limited | Real estate | 2018 |
| Tapesh Print Ltd | Professional & scientific | 2013 |
| Tapkeshwar Services & Parts Ltd | Wholesale & retail | 2019 |
| Tapps Plumbing & Heating Ltd | Construction | 2016 |
| Tareo (Commonwealth) Ltd | Professional & scientific | 2022 |
| Target Retirement Ltd | Professional & scientific | 2024 |
| Tarhni Foods Ltd | Hospitality | 2024 |
| Tariba Properties Ltd | Real estate | 2024 |
| Tariq Halal Meat Wholesale Limited | Wholesale & retail | 2006 |
| Tarius Limited | Information & communication | 2015 |
| Taste of Gujarat Ltd | Hospitality | 2018 |
| Taste of Peshawar Ltd | Hospitality | 2017 |
| Taste of Peshawar Wembley Limited | Hospitality | 2024 |
| Taste Squad Limited | Hospitality | 2026 |
| Tate Illumination Ltd | Manufacturing | 2022 |
| Tattvani Ltd | Administrative & support | 2025 |