| THE Film Store Limited | Extraterritorial | 2003 |
| THE FOX Inn (Hallaton) Ltd | Hospitality | 2023 |
| THE Garage Bakehouse HQ Ltd | Manufacturing | 2024 |
| THE Garage Bakehouse Limited | Manufacturing | 2022 |
| THE Garage Holdings Limited | Administrative & support | 2022 |
| THE Garage Pizza Limited | Manufacturing | 2022 |
| THE Garden Lifestyle England Ltd | Wholesale & retail | 2024 |
| THE Garden Project England Ltd | Administrative & support | 2019 |
| THE Good Drinking Company Limited | Professional & scientific | 2022 |
| THE Granaries (Market Harborough) Management Company Limited | Households | 2007 |
| THE Grange RTM Company Limited | Households | 2009 |
| THE Grooming Room (MH) Ltd | Other services | 2023 |
| THE Hidden Yard Limited | Hospitality | 2026 |
| THE Houghton Collection Limited | Hospitality | 2025 |
| THE Ideas Bank Limited | Professional & scientific | 2015 |
| THE Impact Advantage Ltd | Information & communication | 2023 |
| THE Innovation People (TIP) Ltd | Professional & scientific | 2004 |
| THE Intimates Studio Ltd | Professional & scientific | 2022 |
| THE John Hill Partnership LLP | | 2018 |
| THE KID Collective Ltd | Wholesale & retail | 2009 |
| THE Labelling Company Limited | Manufacturing | 2009 |
| THE Lakin Fairground Trust Limited | Arts & recreation | 2026 |
| THE Langton Stone Company Limited | Wholesale & retail | 2010 |
| THE Laughing Badger Ltd. | Professional & scientific | 2011 |
| THE Leicestershire Heating Company Ltd | Construction | 2018 |
| THE Leigh Lambert Gallery Limited | Wholesale & retail | 2023 |
| THE Little Big Travel Company Ltd | Administrative & support | 2024 |
| THE Little Moonfox Company Ltd | Education | 2025 |
| THE Lodge EOT Limited | Financial services | 2023 |
| THE LOG Cabin ( Braybrooke) Ltd | Real estate | 2021 |
| THE MAD Badgers Limited | Wholesale & retail | 2025 |
| THE Market Harborough Bathroom Company Ltd | Construction | 2024 |
| THE Meetings Industry Association | Other services | 1990 |
| THE Melody Crafters Ltd | Arts & recreation | 2024 |
| THE Memorabilia Palace Limited | Wholesale & retail | 2026 |
| THE Mews Fairfield Road Residents Management Company Limited | Households | 2018 |
| THE Mixology Collection Ltd | Wholesale & retail | 2019 |
| THE Modern Stationer Ltd | Manufacturing | 2018 |
| THE Motion Machine Limited | Professional & scientific | 2020 |
| THE Needle Company Ltd | Wholesale & retail | 1998 |
| THE Needleworks RTM Company Limited | Households | 2022 |
| THE Nevill Arms (Medbourne) Limited | Hospitality | 2021 |
| THE Nicu Space CIC | Health & social care | 2025 |
| THE Orchards Management Company Limited | Professional & scientific | 2000 |
| THE Owners Network Limited | Other services | 2021 |
| THE Palms Developments Limited | Construction | 2012 |
| THE PIG & Drake PUB Co Limited | Hospitality | 2018 |
| THE Print Makers Guild Ltd | Professional & scientific | 2024 |
| THE Real Duchess.Com Limited | Wholesale & retail | 2024 |
| THE Rehab Coach Ltd | Health & social care | 2024 |
| THE Safari Bar Ltd | Hospitality | 2021 |
| THE Sandwich Shop (MH) Ltd | Hospitality | 2016 |
| THE Schelle Collection Limited | Manufacturing | 2015 |
| THE Secret Majority Consulting Ltd | Professional & scientific | 2024 |
| THE Shire Workshops Ltd | Manufacturing | 2023 |
| THE Shoopery CIC | Health & social care | 2022 |
| THE Sibbertoft Land Consortium Limited | Households | 1999 |
| THE Sneaky Pubs Group Ltd | Financial services | 2026 |
| THE Society of Heads | Education | 1996 |
| THE Society of Licensed Conveyancers | Other services | 1989 |
| THE Society of Master Repairers Ltd | Other services | 1963 |
| THE Springboard Consultancy Limited | Education | 2003 |
| THE Stableyard (Hallaton) Management Co. Limited | Households | 2010 |
| THE Star of Thrapston Limited | Hospitality | 2025 |
| THE Sun Inn Great Easton Limited | Hospitality | 2013 |
| THE Supreme Vape Shop Ltd | Wholesale & retail | 2016 |
| THE Swing Yard Ltd | Arts & recreation | 2026 |
| THE Tailored Teacher Ltd | Education | 2024 |
| THE Torch Trust for the Blind | Manufacturing | 2002 |
| THE Traditional Company (Ironwork) Limited | Construction | 2014 |
| THE Traditional Company (Fabrication) Limited | Construction | 2018 |
| THE Traditional Group Holdings Limited | Financial services | 2018 |
| THE Treat Company (UK) Limited | Real estate | 2008 |
| THE Union Wharf South Management Company Limited | Households | 1998 |
| THE Utility Xperts Ltd | Wholesale & retail | 2024 |
| THE VIP Suite Limited | Professional & scientific | 2011 |
| THE Walled Garden Management Company (Hallaton) Limited | Households | 2006 |
| THE Wine Shed Ltd | Hospitality | 2025 |
| THE Woodlands Conservation Co. Limited | Administrative & support | 1999 |
| Thehealthfinder Holdings Limited | Information & communication | 2005 |
| Thermal Issues Limited | Manufacturing | 2014 |
| Thetradehut Ltd | Wholesale & retail | 2022 |
| Think YOU CAN Productions Ltd | Arts & recreation | 2025 |
| Thinking Space (International) Ltd | Professional & scientific | 2022 |
| This IS Huxley Ltd | Administrative & support | 2019 |
| This Modern Existence Ltd | Professional & scientific | 2023 |
| Thomas Castle Aviation Heritage Ltd | Other services | 2020 |
| Thomas Hairdressing Market Harborough Limited | Other services | 2023 |
| Thomson Broadbent Limited | Households | 2014 |
| Thorn Performance Physiotherapy & Pilates Ltd. | Health & social care | 2017 |
| Thornby Associates Limited | Professional & scientific | 2010 |
| Thorne and Sons Limited | Agriculture & fishing | 2025 |
| Thorpe Interior Group Limited | Professional & scientific | 2015 |
| Thorpe's Flooring Limited | Construction | 2013 |
| Thorpe's Joinery Limited | Manufacturing | 1996 |
| Thorpes of Great Glen Limited | Extraterritorial | 2016 |
| Thoughtfully Sourced Ltd | Wholesale & retail | 2022 |
| Thrandeston Ltd | Administrative & support | 2022 |
| Three Jolly Butchers Limited | Administrative & support | 2004 |
| Thrive RAW Limited | Wholesale & retail | 2025 |