| Swiftkeys Transport Ltd | Transport & logistics | 2025 |
| Synergy GAS & Compliance Ltd | Construction | 2026 |
| Syng Power Consulting Ltd | Professional & scientific | 2024 |
| Sysdev Laboratories UK Limited | Information & communication | 2022 |
| T Christie & SON Transport Ltd | Transport & logistics | 2009 |
| T&C Property INVESTMENTS1 Ltd | Real estate | 2015 |
| T&R Facilities Services Ltd | Administrative & support | 2023 |
| T&R Group Services & Management Ltd | Administrative & support | 2022 |
| T2 Luxury Cars Limited | Transport & logistics | 2026 |
| T49 Limited | Real estate | 2015 |
| Tachomanage Limited | Administrative & support | 2008 |
| Tailored Travel 4 U Ltd | Administrative & support | 2026 |
| Talara Investment Ltd | Real estate | 2025 |
| Talk to the Fire CIC | Health & social care | 2025 |
| Talks With Temi Consultancy Ltd | Health & social care | 2024 |
| Talkwood Productions Ltd | Arts & recreation | 2009 |
| Tangent Business Acquisitions Limited | Real estate | 2010 |
| Tangled Vine Limited | Wholesale & retail | 2015 |
| Taykirk Ltd | Information & communication | 1999 |
| Taylor Reeves and Boult Ltd | Real estate | 2013 |
| Taylored Roofing Ltd | Construction | 2008 |
| TBB Studios Ltd | Other services | 2024 |
| Tbmk Holdings Ltd | Administrative & support | 2022 |
| TBO Logistics Ltd | Transport & logistics | 2014 |
| TC 68 Ltd | Real estate | 2025 |
| TDK Coaching Limited | Arts & recreation | 2021 |
| Team Smith (Newport Pagnell) Limited | Hospitality | 2014 |
| Technealt Limited | Professional & scientific | 1978 |
| Temple Distribution Ltd | Transport & logistics | 2026 |
| Tempus Labour Limited | Administrative & support | 2018 |
| Terminax UK Limited | Wholesale & retail | 2025 |
| Terragen Environmental Consultants Limited | Construction | 2006 |
| TG House Limited | Financial services | 2021 |
| TG Training Ltd | Transport & logistics | 2025 |
| Thcafe Ltd | Hospitality | 2023 |
| THE Advance Partnership Ltd | Professional & scientific | 2000 |
| THE Aesthetics House - MK Ltd | Other services | 2026 |
| THE BOP Won'T Stop Ltd | Arts & recreation | 2018 |
| THE Borrowed Brick Ltd | Wholesale & retail | 2026 |
| THE Bull PUB Ltd | Hospitality | 2023 |
| THE Business Change Hub Limited | Professional & scientific | 2025 |
| THE Canons Healthcare Limited | Health & social care | 2015 |
| THE Chester Arms Restaurant Ltd | Hospitality | 2023 |
| THE Commercial Hub Solutions Limited | Real estate | 2025 |
| THE Electra Tattoo Company Limited | Other services | 2022 |
| THE Game Changer Kitchen Ltd | Hospitality | 2018 |
| THE Game Changer Training Ltd | Other services | 2022 |
| THE George Galvin Building Company Limited | Construction | 2023 |
| THE Green Cocoa LAB Limited | Wholesale & retail | 2021 |
| THE Hotel Consultant Ltd | Hospitality | 2015 |
| THE Hunt Lodge Hotel Ltd | Hospitality | 2026 |
| THE Idols Group Limited | Information & communication | 2007 |
| THE Instrument Factory Ltd | Information & communication | 2020 |
| THE Kingdom-Life Entrepreneurs Limited | Other services | 2020 |
| THE Lamb SG Community PUB Limited | Hospitality | 2025 |
| THE Little Branding Company Limited | Wholesale & retail | 2011 |
| THE Lounge Bedford Limited | Hospitality | 2024 |
| THE Maclellan Giving Together Foundation Ltd | Other services | 2024 |
| THE Menopause, Health and Wellbeing Clinic Limited | Health & social care | 2024 |
| THE Minimal Room Ltd | Professional & scientific | 2019 |
| THE MK Biergarten Ltd | Hospitality | 2016 |
| THE MUM Adventures Guide Limited | Information & communication | 2026 |
| THE Old School House Group Ltd | Financial services | 2018 |
| THE Park Management Company (LB) Limited | Households | 2015 |
| THE RMW Group Limited | Professional & scientific | 2015 |
| THE Sandwich Shack MK Ltd | Hospitality | 2022 |
| THE Squirrel PUB Co. Ltd | Hospitality | 2020 |
| THE Stretch Tent Company Limited | Administrative & support | 2020 |
| THE Swans Community Partnership C.I.C. | Education | 2025 |
| THE Tramworks a Management Co Ltd | Households | 2025 |
| THE Tramworks B Management Co Ltd | Households | 2025 |
| THE Tramworks C Management Co Ltd | Households | 2025 |
| THE Tramworks D Management Co Ltd | Households | 2025 |
| THE Tramworks EBA Management Co Ltd | Households | 2025 |
| THE Tramworks Estate Management Co Limited | Households | 2025 |
| THE Tramworks T Blocks MAN Co Ltd | Households | 2025 |
| THE Tramworks T2 Management Co Ltd | Households | 2025 |
| THE Tramworks T3 Management Co Ltd | Households | 2025 |
| THE Truth Doctors Ltd | Professional & scientific | 2019 |
| THE Wheatsheaf Shopping Centre Limited | Administrative & support | 2022 |
| Thekedars Ltd | Health & social care | 2022 |
| Theoldswan Ltd | Hospitality | 2025 |
| Theplanner Ltd | Administrative & support | 2016 |
| Thistlebee Property Ltd | Real estate | 2023 |
| Thomas Fabian Media Ltd | Information & communication | 2026 |
| Thompson Marine Europe Ltd | Wholesale & retail | 2013 |
| Thompsons Wharf Management Company Limited | Households | 1989 |
| Thorium Holdings Ltd | Information & communication | 2023 |
| Thorne Project Solutions Limited | Professional & scientific | 2024 |
| Thoud Developments Limited | Real estate | 2009 |
| Thoughtful Education Limited | Education | 2022 |
| Three Counties Nurse & Care Services Ltd | Health & social care | 2009 |
| Thunk Studio Limited | Professional & scientific | 2022 |
| Tickford Cottages Management Company Limited | Extraterritorial | 2011 |
| Tilesure Ltd | Construction | 2005 |
| Tillsist Ltd | Construction | 2015 |
| Tilltech Systems Ltd | Information & communication | 2016 |
| Timeless Entertainment Ltd | Arts & recreation | 2014 |
| Tithe Homes Limited | Real estate | 2024 |
| Tithe Investments Limited | Real estate | 2014 |