| THE Horncastle Town Football Club Limited | Arts & recreation | 2013 |
| THE Lifestyle Chiropractic Limited | Health & social care | 2005 |
| THE Lovely Little Gift Co Limited | Wholesale & retail | 2019 |
| THE Moral Compass Ltd | Wholesale & retail | 2024 |
| THE Old Stables (Lincolnshire) Limited | Hospitality | 2015 |
| THE Stanhope Hall | Arts & recreation | 2009 |
| THE Yard Fitness Limited | Arts & recreation | 2023 |
| Thermogreen Limited | Construction | 2013 |
| Thornton Heights Limited | Construction | 2003 |
| Thornton Lodge Farm Ltd | Agriculture & fishing | 2011 |
| Thrive HR Solutions Limited | Professional & scientific | 2025 |
| Titan Fibre Ltd | Construction | 2023 |
| Toby Clowes Tyres Limited | Wholesale & retail | 2006 |
| Trajan Software Limited | Information & communication | 1996 |
| TRC Lincs Ltd | Administrative & support | 2023 |
| Tumpers Ltd | Real estate | 2025 |
| Turner Evans Stevens (Horncastle) Ltd | Real estate | 2016 |
| Twang Media Ltd | Information & communication | 2011 |
| Twins Media Limited | Professional & scientific | 2010 |
| Tyrrell & Noble Limited | Construction | 2017 |
| Vale Livestock Company Limited | Agriculture & fishing | 2009 |
| Velluna Ltd | Wholesale & retail | 2025 |
| Venture Independent School Ltd | Education | 2025 |
| Vere Land Holdings Limited | Real estate | 1924 |
| VET on the Corner Ltd | Professional & scientific | 2023 |
| VG Farms Limited | Professional & scientific | 1997 |
| Vice Recruitment Limited | Administrative & support | 2023 |
| Vicki Head Photography Ltd. | Professional & scientific | 2019 |
| Virtu Mannequins Ltd | Wholesale & retail | 2025 |
| Virtually Numbers Limited | Financial services | 2020 |
| W.H.Urry and Sons Ltd | Agriculture & fishing | 2003 |
| Wattam Limited | Agriculture & fishing | 2002 |
| WAX Jacket Agri Ltd | Real estate | 2021 |
| Wayne Waby Electrical and Mechanical Installations Limited | Construction | 2006 |
| Wellies (Horncastle) Limited | Education | 2007 |
| West Ashby Farms Limited | Agriculture & fishing | 2006 |
| WGL Homes Ltd | Real estate | 2026 |
| White Knuckle Bikes Limited | Professional & scientific | 2009 |
| White Tail Aero Limited | Professional & scientific | 2002 |
| Wilsons Window Cleaning Ltd | Administrative & support | 2017 |
| WIN4ACAUSE Limited | Administrative & support | 2025 |
| Winter Circus Productions Limited | Professional & scientific | 2015 |
| Wintmoor Holdings Limited | Extraterritorial | 1996 |
| Wintmoor Market Gardens Limited | Agriculture & fishing | 1948 |
| Wolds Business Skills Network | Administrative & support | 2005 |
| Wolds Firewood Limited | Wholesale & retail | 2018 |
| Wright Way Sports & Education Ltd | Education | 2025 |
| ZR Tyres Limited | Wholesale & retail | 2011 |
| Zynelle Ltd | Wholesale & retail | 2026 |