| THE OIL Tank MAN Limited | Wholesale & retail | 2020 |
| THE Old Granary Furniture Limited | Wholesale & retail | 2017 |
| THE Organised Cleaning Company Limited | Administrative & support | 2011 |
| THE OSS Box Company Limited | Hospitality | 2017 |
| THE Oven Cleaner GY Limited | Other services | 2017 |
| THE Paddocks Tetney (Management) Limited | Households | 2020 |
| THE Park at Louth Management Company Limited | Professional & scientific | 2017 |
| THE Pelham Suite Limited | Hospitality | 2008 |
| THE Pineapple Music Club Ltd | Administrative & support | 2020 |
| THE Place Mini Store Ltd | Wholesale & retail | 2026 |
| THE Plough Inn Lincolnshire Limited | Hospitality | 2020 |
| THE Plough Inn Tetney Limited | Hospitality | 2012 |
| THE Plough Sturton Ltd | Hospitality | 2019 |
| THE Point (Cleethorpes) Limited | Administrative & support | 2010 |
| THE Positive Co. Ltd | Wholesale & retail | 2011 |
| THE Precision Engraving Co Ltd | Manufacturing | 2017 |
| THE Printing Foundry Ltd | Manufacturing | 2024 |
| THE Property Energy Sustainability Company Limited | Professional & scientific | 2021 |
| THE Quays 27/39 Limited | Real estate | 2013 |
| THE Rattling PAN Ltd | Hospitality | 2015 |
| THE Red DOT Company (UK) Ltd | Financial services | 2016 |
| THE Refinery Design Limited | Professional & scientific | 2003 |
| THE Registry Falkirk Limited | Real estate | 2026 |
| THE Retreat at the Oasis Limited | Other services | 2015 |
| THE Roofing Co Consultants Ltd | Construction | 2025 |
| THE Roofing Co Group Ltd | Financial services | 2025 |
| THE Rose River Home Fragrances Limited | Wholesale & retail | 2025 |
| THE Roxton Property Group Ltd | Real estate | 2025 |
| THE Sage Restaurant Limited | Hospitality | 2022 |
| THE Saints Schools Limited | Education | 2021 |
| THE Service Centre (Grimsby) Limited | Wholesale & retail | 2001 |
| THE Sewing Studio Grimsby Ltd | Manufacturing | 2026 |
| THE Ship Inn Leisure Ltd | Hospitality | 2024 |
| THE Sky's the Limit Household and Furniture Ltd | Wholesale & retail | 2019 |
| THE Smokehouse (Grimsby) Limited | Manufacturing | 2023 |
| THE Snowfields Network Ltd | Information & communication | 2012 |
| THE Snug Grimsby C.I.C. | Hospitality | 2025 |
| THE Social Lounge Limited | Hospitality | 2019 |
| THE Sorority Beauty LAB Ltd | Other services | 2019 |
| THE Stables Development (2016) Ltd | Construction | 2016 |
| THE Stables Development (Tetney) Company Limited | Hospitality | 2003 |
| THE Swale G3 Management Limited | Real estate | 2017 |
| THE Talent Circle Search and Selection Ltd | Administrative & support | 2023 |
| THE Tannery Bar Limited | Extraterritorial | 2019 |
| THE TIM MAN Ltd | Hospitality | 2022 |
| THE Training Centre (Grimsby) Ltd | Education | 2020 |
| THE Tungsten Inn Ltd | Wholesale & retail | 2025 |
| THE Tyre Exchange Limited | Wholesale & retail | 2022 |
| THE UK WAX Company Ltd | Manufacturing | 2025 |
| THE Ultimate Balance Ltd | Administrative & support | 2021 |
| THE Van Franchise Ltd | Wholesale & retail | 2007 |
| THE Warwicks Club Ltd | Hospitality | 2013 |
| THE Waterfront Residents Association Limited | Administrative & support | 2005 |
| THE Web Guys Derby Ltd | Professional & scientific | 2013 |
| THE Wellowgate Cafe Grimsby Ltd | Hospitality | 2025 |
| THE Wendy House (Himley) Ltd | Hospitality | 2009 |
| THE Women's Exchange Limited | Wholesale & retail | 2019 |
| THE Wonky Moose Ltd | Hospitality | 2022 |
| Theonestop.Co.Uk Ltd | Manufacturing | 2013 |
| Theory Transport and Logistics Ltd | Transport & logistics | 2025 |
| Therm Clad Solutions Limited | Manufacturing | 2012 |
| Thermotec Roofing Systems Ltd | Construction | 2011 |
| THESALON75 Ltd | Other services | 2022 |
| Thimbleby Lakes Country Park Limited | Real estate | 2022 |
| Think Accounting Services Ltd | Professional & scientific | 2019 |
| Think Employment Limited | Education | 2000 |
| Think Green (Trading) Ltd | Wholesale & retail | 2022 |
| Think Online Training Limited | Education | 2020 |
| Thiquin Ltd | Hospitality | 2024 |
| Third Link Consulting Ltd | Professional & scientific | 2017 |
| Thirteen Financial Services Ltd | Professional & scientific | 2025 |
| Tholis Consultancy Ltd | Professional & scientific | 2025 |
| Thomas Ellis Bespoke Interiors Ltd | Construction | 2022 |
| Thompson Heritage Estates Ltd | Real estate | 2024 |
| Thor Building Services Limited | Construction | 2011 |
| Thoresby Meadows at Thoresby Management Company Limited | Professional & scientific | 2025 |
| Thornley Investments Limited | Real estate | 2018 |
| Thorpe Property Investments Limited | Real estate | 2018 |
| Three Lions Retail Ltd | Wholesale & retail | 2026 |
| Three Ogres Ltd | Arts & recreation | 2018 |
| Three Sister Shellfish Limited | Financial services | 2025 |
| Thrive Accountancy Ltd | Professional & scientific | 2023 |
| Thrive and Profit Ltd | Professional & scientific | 2019 |
| Thrive Professional Ltd | Professional & scientific | 2020 |
| Thrive Sales Advisory Ltd | Professional & scientific | 2025 |
| Thundercliffe Photography Limited | Professional & scientific | 2025 |
| Tidi & Parents Ltd | Wholesale & retail | 2025 |
| Tiger Investment Properties GRR Ltd | Extraterritorial | 2014 |
| Tilletts Holdings Limited | Real estate | 2022 |
| Tilletts Wholesale Limited | Wholesale & retail | 2024 |
| Tilleys Sandwich Bar Ltd | Hospitality | 2003 |
| Tilson's Plumbing and Heating Ltd | Construction | 2020 |
| TIM Dray Engineering Limited | Professional & scientific | 2014 |
| Timbered Floors & Accessories Ltd | Construction | 2015 |
| Time to Shine Valeting Grimsby Ltd | Other services | 2019 |
| Timeout Tavern Limited | Hospitality | 2020 |
| Timisoara Electric Ltd | Construction | 2019 |
| TIP Top TOE (Grimsby) Ltd | Other services | 2010 |
| TIP Top TOE Beauty Limited | Other services | 2011 |
| Tips and Troncs Limited | Administrative & support | 2025 |