| Swiftt Limited | Wholesale & retail | 2024 |
| Swinton (Holdings) Limited | Professional & scientific | 1983 |
| Swinton Properties Limited | Real estate | 1983 |
| Switzer Sports Limited | Professional & scientific | 2022 |
| Swmc Property Holdings Limited | Real estate | 2024 |
| SXB Electrical Limited | Construction | 2023 |
| SY Electronics Limited | Professional & scientific | 1983 |
| SY Estates Limited | Real estate | 2017 |
| Sycamore Capital and Finance Limited | Financial services | 2026 |
| Sycamore Integrated Solutions Limited | Financial services | 2025 |
| Syed Waheed UL Zaman Ltd | Wholesale & retail | 2025 |
| SYK Investments Ltd | Real estate | 2024 |
| SYK Medical Care Ltd | Health & social care | 2022 |
| Syla AI Ltd | Administrative & support | 2025 |
| Syllasweet Cakery Ltd | Wholesale & retail | 2025 |
| Sylvain Aelion Ltd | Real estate | 2022 |
| Sylvan Apartments Management Company Limited | Households | 2025 |
| SYM Properteis Limited | Real estate | 2019 |
| Syma Estates Ltd | Construction | 2025 |
| Symbol Property Group Limited | Administrative & support | 2020 |
| Symphony Strands Ltd | Other services | 2024 |
| Synergie Portfolio Limited | Extraterritorial | 2019 |
| Sysco Property Care Ltd | Households | 2026 |
| Systemize Success Ltd | Administrative & support | 2023 |
| Syte Construction Ltd | Construction | 2024 |
| Sytime Limited | Other services | 2025 |
| SZF Investment Limited | Real estate | 2026 |
| SZG Europe Limited | Wholesale & retail | 2014 |
| T & E Business Services Ltd | Information & communication | 2025 |
| T & E Legal Limited | Professional & scientific | 2023 |
| T 3 Investment Limited | Administrative & support | 2026 |
| T a Hulme Limited | Professional & scientific | 2024 |
| T Burch Translation Ltd | Professional & scientific | 2026 |
| T Doherty Properties Limited | Real estate | 2023 |
| T H Construction Limited | Construction | 1980 |
| T H Legal Ltd | Professional & scientific | 2024 |
| T J Brent Limited | Extraterritorial | 2000 |
| T R Sweets Limited | Manufacturing | 2019 |
| T&H Fixers Limited | Construction | 2017 |
| T&J Textiles & Hosiery Limited | Wholesale & retail | 2015 |
| T-Accounting Services Ltd | Professional & scientific | 2016 |
| T-Commerce Ltd | Wholesale & retail | 2020 |
| T-Let Ltd | Real estate | 2022 |
| T-Xchange Ltd | Administrative & support | 2018 |
| TA Salford Limited | Real estate | 2025 |
| TA2 Properties Limited | Real estate | 2018 |
| Taav Biomanufacturing Solutions Ltd | Professional & scientific | 2017 |
| Tabbron Associates Limited | Arts & recreation | 2019 |
| Tacmeduk Limited | Wholesale & retail | 2020 |
| Tacorrito Ltd | Hospitality | 2022 |
| Tagas Limited | Real estate | 2024 |
| Tahu Development Limited | Real estate | 2017 |
| Tahu Property Limited | Real estate | 2017 |
| Tail Fire Ltd | Real estate | 2018 |
| Tailorcode Ltd | Information & communication | 2026 |
| Takal Limited | Wholesale & retail | 2023 |
| Take Action Together CIC | Health & social care | 2022 |
| TAL Investments MCR Ltd | Real estate | 2021 |
| Talbot Terrace Estates Limited | Other services | 2025 |
| Talktalk a Co Limited | Information & communication | 2026 |
| Talktalk B Co Limited | Information & communication | 2026 |
| Talktalk Brands Limited | Information & communication | 2006 |
| Talktalk Business (2CCH) Limited | Information & communication | 2008 |
| Talktalk Business Direct Limited | Information & communication | 2018 |
| Talktalk C Co Limited | Information & communication | 2026 |
| Talktalk Communications Limited | Information & communication | 1999 |
| Talktalk Corporate Limited | Information & communication | 2008 |
| Talktalk Direct Limited | Information & communication | 2004 |
| Talktalk Finco 2 Limited | Information & communication | 2024 |
| Talktalk Finco Limited | Professional & scientific | 2020 |
| Talktalk Group Limited | Information & communication | 2008 |
| Talktalk Holdings Limited | Information & communication | 2020 |
| Talktalk Midco Limited | Professional & scientific | 2020 |
| Talktalk Telecom Group Limited | Information & communication | 2009 |
| Talktalk Telecom Holdings Limited | Information & communication | 1996 |
| Talktalk Telecom Limited | Information & communication | 2003 |
| Talktalk TV Entertainment Limited | Administrative & support | 2006 |
| Tallis International Ltd | Wholesale & retail | 2025 |
| Talmud Torah Nominees | Education | 2010 |
| Talmud Torah Y LEV Child Care Limited | Health & social care | 2021 |
| Talmud Torah Y LEV Limited | Education | 2021 |
| Talmud Torah Yetev LEV Child Care Limited | Health & social care | 2015 |
| Talmud Torah Yetev LEV Ltd. | Health & social care | 2003 |
| Talmud Torah Yitev LEV Ltd | Education | 2019 |
| Talyan Wyndhurst Limited | Professional & scientific | 2026 |
| Tamami Healthcare Ltd | Administrative & support | 2023 |
| Tamami Properties Limited | Real estate | 2025 |
| Tameside Blinds Limited | Extraterritorial | 2021 |
| Tammony PTY Ltd | Real estate | 2024 |
| Tamworth Estate Ltd | Real estate | 2001 |
| Tanck Ltd | Wholesale & retail | 2018 |
| Tandoori Delights Ltd | Hospitality | 2016 |
| Tangerine Gold Rock Limited | Mining & quarrying | 2025 |
| Tangmere Limited | Wholesale & retail | 2025 |
| Tanmin Limited | Wholesale & retail | 2024 |
| Tanning Centre North West Ltd | Other services | 2023 |
| Tapcastle Limited | Real estate | 2023 |
| Tappro Holding Limited | Real estate | 2022 |
| Tappro UK Limited | Wholesale & retail | 2022 |
| Taprave Ltd | Wholesale & retail | 2024 |