| Tanglewood Care Services Limited | Health & social care | 2015 |
| Tanglewood Holding Company 2 Limited | Administrative & support | 2021 |
| Tanglewood Holding Company 3 Limited | Other services | 2023 |
| Tanglewood Holding Company Limited | Health & social care | 2019 |
| Tanglewood Project Company Grantham Limited | Administrative & support | 2016 |
| Tanglewood Project Company NO. 2 Limited | Health & social care | 2020 |
| Tanglewood Project Company NO. 3 Limited | Health & social care | 2020 |
| Tanglewood Project Company NO.1 Limited | Health & social care | 2020 |
| Tanglewood Shared Services Limited | Administrative & support | 2014 |
| TAPE4TREES Ltd | Agriculture & fishing | 2022 |
| Tates Pizza Limited | Hospitality | 2024 |
| Tattershall Court (Boston) Limited | Households | 1993 |
| Tattershall Tackle Limited | Wholesale & retail | 2021 |
| Taurus Locks & Glazing Ltd | Construction | 2020 |
| Tawnymeade Alpaca's Ltd | Agriculture & fishing | 2022 |
| Taylor Family Properties Limited | Real estate | 2019 |
| Taylor Kelham Ltd | Construction | 2022 |
| Taylor Made Services UK Limited | Real estate | 2006 |
| Taylored Hospitality Ltd | Hospitality | 2025 |
| Taylored Lettings (Boston) Ltd | Real estate | 2021 |
| Taylored Security Services Limited | Construction | 2011 |
| Tayloritex Community Interest Company | Education | 2009 |
| Taylors Investments (Boston) Limited | Real estate | 2016 |
| Taylors Limited | Professional & scientific | 1987 |
| Taylors of Spalding Limited | Wholesale & retail | 1948 |
| Taylors Service Garages (Boston) Limited | Wholesale & retail | 1974 |
| Taylors Services Garages (Holdings) Limited | Financial services | 2025 |
| Taylor`D Consulting Ltd | Professional & scientific | 2006 |
| Taysim Developments Limited | Construction | 2024 |
| TC Accountancy Ltd | Professional & scientific | 2014 |
| Team Christie Showjumping Ltd | Wholesale & retail | 2021 |
| Technicoat Labradors (Linc's) Ltd | Agriculture & fishing | 2021 |
| Technovouk Ltd | Wholesale & retail | 2022 |
| Ted's VEG Ltd | Wholesale & retail | 2024 |
| Teddy's Mini Market Ltd | Wholesale & retail | 2025 |
| TEE G Beats Ltd | Wholesale & retail | 2020 |
| TEK Tech Ltd | Other services | 2020 |
| Tekco Ltd | Extraterritorial | 2026 |
| Tels Logistics Limited | Transport & logistics | 2015 |
| Tempest Consultancy Limited | Administrative & support | 2008 |
| TEO the Wizard Ltd | Arts & recreation | 2023 |
| Terra Firma Estates Limited | Real estate | 1992 |
| Terra Logistics 1 Limited | Transport & logistics | 2025 |
| Terrahybrid Fencing Ltd | Wholesale & retail | 2026 |
| TFE Limited | Real estate | 1980 |
| TFL Logistics Limited | Transport & logistics | 2011 |
| THE Askefield Project Ltd | Health & social care | 2017 |
| THE Barber Shoppe (Holbeach) Ltd | Other services | 2016 |
| THE Barber Shoppe (Newark) Limited | Other services | 2007 |
| THE Barber Shoppe (Sutton) Limited | Other services | 2007 |
| THE Beauty Branch Limited | Other services | 2020 |
| THE BIZ -School of Performing Arts Limited | Education | 2018 |
| THE Blond Organisation Limited | Arts & recreation | 2014 |
| THE Blue Shop OFF Licence & Market Ltd | Wholesale & retail | 2019 |
| THE Boston Sign Company Ltd | Manufacturing | 2016 |
| THE Boston Volunteer Centre Charity | Real estate | 1997 |
| THE Boston Woods Trust | Agriculture & fishing | 2001 |
| THE Bostonian Lettings Company Ltd | Real estate | 2010 |
| THE Boundary (Boston) Management Co Ltd | Households | 2020 |
| THE Broadway Drawing School Limited | Education | 2013 |
| THE Butterfly Hospice Trust | Health & social care | 2005 |
| THE Clumsy Goat Pet Shed Ltd | Wholesale & retail | 2026 |
| THE Coaching Inn Group Ltd | Arts & recreation | 1996 |
| THE Collective Health Practice Ltd | Health & social care | 2026 |
| THE Community Growers CIC | Agriculture & fishing | 2023 |
| THE Coney Consultancy Limited | Professional & scientific | 2023 |
| THE Consultancy Collective (London) Ltd | Professional & scientific | 2020 |
| THE Corner Shop (Boston) Ltd | Wholesale & retail | 2018 |
| THE Delancy Group Ltd | Real estate | 2020 |
| THE EEL Screen Company Ltd. | Construction | 2015 |
| THE Egyptian Stone Company Ltd | Construction | 2025 |
| THE Ethical Harvesting Co Ltd | Extraterritorial | 2019 |
| THE Firs Hotel (Boston) Ltd | Hospitality | 2020 |
| THE Foreign Property Shop.Com Ltd. | Extraterritorial | 2006 |
| THE Holiday Artist Ltd | Administrative & support | 2023 |
| THE Home Nursery Limited | Education | 2015 |
| THE House of Aetherius Ltd | Health & social care | 2025 |
| THE Jacobs Group Ltd | Information & communication | 2025 |
| THE Keystroke Business Group Ltd | Administrative & support | 2022 |
| THE Lakeside Pizza Shed Ltd | Hospitality | 2024 |
| THE Lincolnshire Oven Cleaning Company Ltd | Administrative & support | 2016 |
| THE Lincolnshire Stable Company Limited | Manufacturing | 2025 |
| THE Lincs Group Ltd | Construction | 2017 |
| THE Lock Whisperer Ltd | Administrative & support | 2013 |
| THE Lord Grey Ltd | Hospitality | 2019 |
| THE Machine Quilter Company Ltd | Wholesale & retail | 2006 |
| THE Malc (2024) Limited | Hospitality | 2024 |
| THE Mallards (Peakirk) Management Company Limited | Households | 2024 |
| THE Mason Family Partnership LLP | | 2018 |
| THE New England Hotel (Boston) Limited | Hospitality | 2019 |
| THE New View Group(Nvg) Ltd | Construction | 2025 |
| THE Pizza Shed & Bar Ltd | Hospitality | 2026 |
| THE Place Property Ltd | Real estate | 2026 |
| THE Plants YOU Deserve Ltd | Wholesale & retail | 2023 |
| THE Quayside Hotel (Boston) Limited | Hospitality | 2017 |
| THE Red BUS Cartridge Company Limited | Wholesale & retail | 2016 |
| THE Red Lion Hotel (Spalding) Limited | Hospitality | 2016 |
| THE Red Moose Group Ltd | Professional & scientific | 2023 |
| THE Red Onion Property Company Ltd | Real estate | 2020 |
| THE Red Onion Trading Company Ltd | Wholesale & retail | 2024 |