| Terry Peach Ltd | Transport & logistics | 2007 |
| Test Valley Consultancy Limited | Professional & scientific | 2024 |
| Test Valley Prestige and Performance Limited | Wholesale & retail | 2026 |
| Test Valley Products Limited | Wholesale & retail | 1986 |
| Test Way Kitchens Ltd | Construction | 2023 |
| Test Way Trees Limited | Administrative & support | 2021 |
| Tetlow King (South West) Limited | Extraterritorial | 2014 |
| Tetlow King Holdings Limited | Professional & scientific | 2005 |
| Tetlow King Limited | Professional & scientific | 2014 |
| Tettmann Ltd | Arts & recreation | 2018 |
| TFG Medical Limited | Health & social care | 2019 |
| TFS Consulting Ltd | Information & communication | 2025 |
| Thames Valley Hand & Wrist Surgery Limited | Health & social care | 2025 |
| That Little Tea Shop Ltd | Hospitality | 2025 |
| THE AEC Group (U.K.) Ltd | Financial services | 2022 |
| THE Armstrong Care Company Limited | Health & social care | 2023 |
| THE Barbers (Romsey) Ltd | Other services | 2021 |
| THE Barbers Room (Romsey) Ltd | Other services | 2025 |
| THE Barns and the Lakes (Romsey) Management Company Limited | Households | 2025 |
| THE Big White Dog Co Limited | Information & communication | 2025 |
| THE Braishfield Pantry Limited | Wholesale & retail | 2017 |
| THE Bravovictor Group Limited | Financial services | 2021 |
| THE Brindley Partnership Limited | Professional & scientific | 2012 |
| THE Centre for Structured Debriefing Limited | Other services | 2000 |
| THE Cherished Dog Cafe Limited | Hospitality | 2020 |
| THE Childhood Learning Consultancy Ltd | Education | 2024 |
| THE Clever Conservatory Company Limited | Extraterritorial | 2016 |
| THE Construction Consultancy (South) Ltd | Professional & scientific | 2025 |
| THE Crafty Tuns Ltd | Hospitality | 2020 |
| THE Croftons Management Company Limited | Households | 2020 |
| THE Custody Coach Ltd | Professional & scientific | 2025 |
| THE Day OUT Competition Ltd | Wholesale & retail | 2023 |
| THE DE Peyer Clinic Ltd | Other services | 2025 |
| THE Deal Packaging Co Ltd | Transport & logistics | 2022 |
| THE Dog House (Boozers) Limited | Hospitality | 2024 |
| THE Driftwood Drive Management Company Limited | Households | 2013 |
| THE Duke on the Test Limited | Hospitality | 2022 |
| THE Dunkirk Ship Company Limited | Manufacturing | 1993 |
| THE Early Years Group Consultancy Ltd | Professional & scientific | 2021 |
| THE Early Years Group Limited | Education | 2018 |
| THE European Society for Vascular Surgery (Publications) Limited | Information & communication | 1986 |
| THE Fire Brigade Museum Limited | Arts & recreation | 2021 |
| THE Frock Shop Limited | Manufacturing | 2019 |
| THE Future Business Ltd | Professional & scientific | 2020 |
| THE Garden Festival Ltd | Administrative & support | 2024 |
| THE Genesis Design Studio Ltd | Professional & scientific | 1993 |
| THE George and Falcon Limited | Hospitality | 2025 |
| THE Go Matilda Service Company Limited | Professional & scientific | 2005 |
| THE Good Hairdressing Guide Limited | Other services | 1992 |
| THE Greatest YOU Limited | Hospitality | 2012 |
| THE Green Office Ltd | Administrative & support | 2026 |
| THE Green Room Romsey Ltd | Other services | 2021 |
| THE Grounds Management Company Ltd | Administrative & support | 2020 |
| THE Hair Witch Academy Ltd | Education | 2020 |
| THE Henry Jane Consultancy Limited | Professional & scientific | 2009 |
| THE House of Comedy Limited | Arts & recreation | 2019 |
| THE Institute of Ecology and Environmental Management | Other services | 1991 |
| THE Insurance Supermarket Limited | Financial services | 2018 |
| THE Lakes (Romsey) Management Company Limited | Households | 2025 |
| THE Lymington Printing Company Ltd | Manufacturing | 2012 |
| THE Malt House PUB Limited | Hospitality | 2019 |
| THE Manor Golf Company Limited | Arts & recreation | 1990 |
| THE Meon Spirit Company Ltd | Manufacturing | 2013 |
| THE Mortgage Stop Ltd | Financial services | 2018 |
| THE Mountbatten School | Education | 2011 |
| THE Orchard 2021 Management Company Limited | Households | 2021 |
| THE Otology Clinic Limited | Health & social care | 2023 |
| THE Portrait Co. Photography Limited | Professional & scientific | 2025 |
| THE Real Apprenticeship Company Limited | Education | 2003 |
| THE Ridge Freehold Company Ltd | Households | 2014 |
| THE Ridge RTM Company Limited | Households | 2009 |
| THE Romsey Agricultural and Horse Show Society Limited | Arts & recreation | 1989 |
| THE RS Electric Boat Co Ltd | Manufacturing | 2019 |
| THE Rubber Company Limited | Manufacturing | 2013 |
| THE Salisbury Office Ltd | Real estate | 2021 |
| THE Skin Specialist Limited | Manufacturing | 2010 |
| THE Smithfield Group Holdings Limited | Financial services | 2023 |
| THE Surveyor Agency Limited | Professional & scientific | 2025 |
| THE Sweet One Limited | Professional & scientific | 2017 |
| THE Test and Itchen Association Limited | Other services | 1946 |
| THE Vantage Trust Limited | Professional & scientific | 2004 |
| THE Vinery Tanners Lane Management Company Limited | Households | 2020 |
| THE Wealth Stop Limited | Financial services | 2021 |
| THE Wellness Hormone Clinic Limited | Health & social care | 2024 |
| THE Wessex Spine Clinic LLP | | 2024 |
| THE Wheatsheaf Braishfield Ltd | Hospitality | 2024 |
| THE Winchester Orangery Ltd | Hospitality | 2018 |
| THE Winston Southampton Ltd | Hospitality | 2025 |
| Theatre Kidz Limited | Education | 2023 |
| Thekitecat Ltd | Other services | 2024 |
| Theodoric European Ltd | Transport & logistics | 2024 |
| Thermotech Wall and Loft Surveys Ltd | Construction | 2022 |
| Thetis Engineering Ltd | Professional & scientific | 2019 |
| Think Local First Limited | Information & communication | 1994 |
| Think Right BE Right Limited | Health & social care | 2019 |
| Think Sharp Tutors LLP | | 2025 |
| Thinking Space Holding Group Limited | Financial services | 2025 |
| Thinking Space Systems Limited | Manufacturing | 2003 |
| Thirtyc Limited | Information & communication | 2015 |
| Thistle and Protea Ltd | Health & social care | 2024 |