| TG Mechanical Ltd | Construction | 2016 |
| Tgmo Mursley Ltd | Hospitality | 2023 |
| TGS Total Groundwork Solutions Ltd | Construction | 2015 |
| That Marketing Company Limited | Financial services | 2020 |
| THE Acoustics Store Ltd | Construction | 2024 |
| THE Ayling PUB Company Ltd | Hospitality | 2018 |
| THE Baker Cannon Accountancy Company, Limited | Professional & scientific | 2011 |
| THE Beauty Pods Ltd | Other services | 2024 |
| THE Bettertax Organisation Ltd | Professional & scientific | 2009 |
| THE Buckingham Distillery Ltd | Manufacturing | 2025 |
| THE Buckingham Soap Club Limited | Manufacturing | 2025 |
| THE Buzz Hub Collective Ltd | Health & social care | 2025 |
| THE Care Dial Limited | Information & communication | 2017 |
| THE Children's Forum Limited | Professional & scientific | 1995 |
| THE Club House Barbering Co Limited | Other services | 2023 |
| THE Cobden Centre | Education | 2010 |
| THE Connection Club Limited | Construction | 2008 |
| THE Cotswold Agency Ltd | Wholesale & retail | 2021 |
| THE Crown Inn Twyford Ltd | Hospitality | 2018 |
| THE Crown Public House Limited | Wholesale & retail | 2025 |
| THE Data Privacy Group Ltd | Professional & scientific | 2015 |
| THE Daylight Engineers Ltd | Construction | 2025 |
| THE Editorial Hub Ltd | Information & communication | 2014 |
| THE ENT Company (MK) Ltd | Health & social care | 2023 |
| THE Executive Partnership Limited | Professional & scientific | 2025 |
| THE Film Place | Professional & scientific | 1999 |
| THE Fire Protection Hub Ltd | Professional & scientific | 2025 |
| THE Florienta App Limited | Information & communication | 2026 |
| THE Flower Story Limited | Arts & recreation | 2016 |
| THE FOX Restaurant Company Limited | Hospitality | 2014 |
| THE Gang Marketing Ltd | Professional & scientific | 2016 |
| THE Garage Door Repair Team Limited | Manufacturing | 2016 |
| THE Good PT Limited | Other services | 2018 |
| THE Hardwood Flooring Shop Ltd | Wholesale & retail | 2021 |
| THE Health Bureau Ltd | Health & social care | 2009 |
| THE Herbalist Health Ltd | Health & social care | 2020 |
| THE Home Maitre D Limited | Manufacturing | 2026 |
| THE House Inspector Ltd | Construction | 2018 |
| THE Hussaineez Group Ltd | Real estate | 2025 |
| THE Independent Fire Engineering & Distributors Association Ltd | Other services | 2015 |
| THE Jump (Northampton) Limited | Administrative & support | 2008 |
| THE Little Buckingham Clinic Ltd | Health & social care | 2026 |
| THE Medical Warehouse Limited | Wholesale & retail | 2000 |
| THE Mickey Market Limited | Administrative & support | 2025 |
| THE Midwife Method Limited | Arts & recreation | 2026 |
| THE Modern Chauffeur Ltd | Transport & logistics | 2017 |
| THE Motor Spa Limited | Wholesale & retail | 2021 |
| THE Movement Studio Dance Fitness Ltd | Arts & recreation | 2021 |
| THE Myalgic Encephalopathy Association Limited | Other services | 1989 |
| THE Myalgic Encephalopathy Society Limited | Other services | 2009 |
| THE Narbury Group Ltd | Information & communication | 2017 |
| THE Numbers People Ltd | Extraterritorial | 2009 |
| THE Old Latin House Freehold (Nominees) Ltd | Real estate | 2019 |
| THE Perfect Music Library Ltd | Administrative & support | 2011 |
| THE Platinum Racing Club Limited | Other services | 2021 |
| THE Racing BUG (UK) Limited | Arts & recreation | 2011 |
| THE Racing BUG Limited | Arts & recreation | 2017 |
| THE Really Useful App Company Ltd | Information & communication | 2026 |
| THE Riot & Danger Collective Limited | Professional & scientific | 2022 |
| THE Rockwood Media Factory Ltd | Information & communication | 2019 |
| THE Royal Latin School | Education | 2011 |
| THE Royal Latin School Trading Company Limited | Real estate | 2020 |
| THE Scrum Holdings Limited | Other services | 2021 |
| THE Skin Specialist Clinics Ltd | Health & social care | 2023 |
| THE Spa @ the Courtyard Ltd | Other services | 2020 |
| THE Store Room Limited | Real estate | 2005 |
| THE Stowe House Preservation Trust | Arts & recreation | 1997 |
| THE Strategy Corporation Ltd | Professional & scientific | 2011 |
| THE Swan Community Hub | Health & social care | 2010 |
| THE Vanguard Method Limited | Professional & scientific | 2015 |
| THE Whole Sale Company (UK) Limited | Information & communication | 2012 |
| Them Outdoors Ltd | Wholesale & retail | 2023 |
| Themainsupplier Limited | Wholesale & retail | 2025 |
| Theory Consulting Ltd | Information & communication | 2021 |
| Theory Investments Limited | Real estate | 2020 |
| Thermasoft Limited | Wholesale & retail | 2012 |
| Think Again Services Limited | Financial services | 2023 |
| Think Consulting Solutions Limited | Professional & scientific | 2001 |
| Thorne Brothers Limited | Financial services | 2024 |
| Thorne Walker Holdings Limited | Manufacturing | 2018 |
| Thotam Ltd | Information & communication | 2015 |
| Thought Support Ltd | Professional & scientific | 2009 |
| Thph Consulting Ltd | Information & communication | 2022 |
| Thrive After Ltd | Wholesale & retail | 2024 |
| Thrive Health Ltd | Health & social care | 2018 |
| Throw Back Vintage Buckingham Ltd | Wholesale & retail | 2025 |
| Tiktok Centric Ltd | Professional & scientific | 2025 |
| Tilling Creative Group Limited | Information & communication | 1997 |
| Time-Sign Products Limited | Arts & recreation | 2002 |
| Tingewick Pottery at Chetwode Limited | Manufacturing | 2011 |
| Tingewick Pre-School Limited | Education | 2003 |
| TJ Geophysics Limited | Mining & quarrying | 2012 |
| TJG Gardens Limited | Administrative & support | 2021 |
| Tkpest Ltd | Agriculture & fishing | 2019 |
| Tktc Limited | Financial services | 2011 |
| TM14 Promotions Ltd | Arts & recreation | 2021 |
| TMP Land Investments Limited | Real estate | 2022 |
| TO BE Frank Media Ltd | Administrative & support | 2022 |
| TOKYO26 Ltd | Information & communication | 2011 |
| Tomojo Limited | Information & communication | 2018 |