| THE Rickyard Cottages Management Co. Limited | Other services | 2012 |
| THE Scented Circle Ltd | Administrative & support | 2024 |
| THE Serenity Practice CIC | Health & social care | 2021 |
| THE Spray Team Lincolnshire Limited | Construction | 2020 |
| THE Stanley Hotel (Boston) Limited | Hospitality | 2015 |
| THE Stapleton Group Limited | Financial services | 2021 |
| THE Thatched Cottage Caravan Park Ltd | Hospitality | 2020 |
| THE Treasure Cart Ltd | Wholesale & retail | 2024 |
| THE Vape Store Boston Limited | Wholesale & retail | 2016 |
| THE Waffle Guys Boston Ltd | Hospitality | 2026 |
| THE Willows Algakirk Ltd | Education | 2020 |
| THE Woodlands Hotel (UK) Limited | Hospitality | 2004 |
| THE Woodlands Natural Burial Ground Ltd | Other services | 2016 |
| THE Yews Holding Company Limited | Professional & scientific | 2016 |
| Thea COX Mortgages Ltd | Financial services | 2014 |
| Thegarageboston Ltd | Wholesale & retail | 2025 |
| Theukmedicalandcommunityprojects Ltd | Professional & scientific | 2022 |
| Thivian Healthcare Limited | Health & social care | 2019 |
| Thivyan Limited | Construction | 2014 |
| THN Properties Limited | Real estate | 2021 |
| Thomas Campbell Estate Agents Ltd | Real estate | 2012 |
| Thompson Motors (Boston) Limited | Manufacturing | 2006 |
| Thorold Farms Limited | Agriculture & fishing | 1959 |
| Thorpe Camp Preservation Group Limited | Arts & recreation | 2013 |
| Thorpe Pharma Ltd | Wholesale & retail | 2023 |
| Threadneedle Street Management Ltd | Professional & scientific | 2019 |
| Three DEE Holdings Limited | Financial services | 2023 |
| Tibor Lapin Ltd | Transport & logistics | 2017 |
| Ticked OFF Limited | Administrative & support | 2017 |
| Tidy Rentals Limited | Households | 2013 |
| Tigina Transport Ltd | Transport & logistics | 2021 |
| Tilly Storage Ltd | Real estate | 2023 |
| TIM Booth Consultancy Services Limited | Professional & scientific | 2006 |
| TIM Richmond (Osteopathic Clinic) Ltd | Health & social care | 2010 |
| Timbersol Ltd | Wholesale & retail | 2024 |
| Time 4 Play Grimsby Ltd | Arts & recreation | 2013 |
| Time to Shine Window Cleaning Ltd | Administrative & support | 2023 |
| Tiny Robins Day Nursery Ltd | Health & social care | 2018 |
| TIP Top Holiday Lets Ltd | Hospitality | 2022 |
| Tipplemill Distillery Limited | Manufacturing | 2021 |
| TIR Barbers Ltd | Other services | 2025 |
| Titeko Ltd | Transport & logistics | 2018 |
| TJ Fitness Limited | Arts & recreation | 2025 |
| TJ Gymnastics Academy Boston Limited | Arts & recreation | 2021 |
| Tjac London Guilford, LLC | | 2024 |
| TJH Sales Ltd | Professional & scientific | 2026 |
| TJS Aggregates (Boston) Limited | Real estate | 2006 |
| TJS Aggregates Ltd | Mining & quarrying | 2017 |
| TJS Landscaping Supplies Ltd | Administrative & support | 2015 |
| TK Project Management Ltd | Professional & scientific | 2025 |
| TL Dedicated Care Ltd | Health & social care | 2024 |
| TMG Creative Limited | Information & communication | 2014 |
| TMS Holdings Limited | Professional & scientific | 2007 |
| TNA Wholesales Ltd | Wholesale & retail | 2024 |
| Toastie Holdings Ltd | Hospitality | 2021 |
| Together Land Adventure Park Ltd | Arts & recreation | 2026 |
| Tomiko Limited | Health & social care | 2016 |
| Tommy & SON Logistic Ltd | Wholesale & retail | 2022 |
| Tonchev Services Ltd | Wholesale & retail | 2026 |
| Tooley Brothers Ltd | Arts & recreation | 2022 |
| Toolsonlincs Ltd | Wholesale & retail | 2025 |
| Top Marks Joinery Contractors Limited | Construction | 2005 |
| Top Sports Management and Consultancy Limited | Professional & scientific | 2022 |
| Tops Pizza Express Ltd | Hospitality | 2019 |
| Topspeedhk Limited | Wholesale & retail | 2026 |
| Torwood Care (Chesterfield) Limited | Health & social care | 2025 |
| Torwood Care (Coulby) Ltd | Health & social care | 2025 |
| Torwood Care (Hinckley) Limited | Health & social care | 2025 |
| Torwood Care (Huddersfield) Limited | Health & social care | 2024 |
| Torwood Care (Macclesfield) Limited | Health & social care | 2025 |
| Torwood Care (Otley) Limited | Health & social care | 2024 |
| Torwood Care 2 Limited | Health & social care | 2023 |
| Torwood Care 3 Holdco Limited | Health & social care | 2023 |
| Torwood Care 3 Parent Limited | Health & social care | 2023 |
| Torwood Care 4 Holdco Limited | Health & social care | 2025 |
| Torwood Care Holdings Limited | Health & social care | 2025 |
| Torwood Care Limited | Health & social care | 2022 |
| Tourist Vintage Ltd | Wholesale & retail | 2024 |
| Tower Gardens (Boston) Management Company Limited | Real estate | 2017 |
| Town & Country Care (Boston) Limited | Health & social care | 2015 |
| Town & Country Hotels and Leisure Ltd | Hospitality | 2023 |
| Town & Country Mobility (Lincolnshire) Ltd | Wholesale & retail | 2006 |
| Town & Country Properties (Boston) Limited | Real estate | 1999 |
| TP Building Constructions Ltd | Construction | 2024 |
| TP Healthcare Ltd | Health & social care | 2020 |
| TPL Renovations Limited | Construction | 2024 |
| Trade Lead Solutions Ltd | Professional & scientific | 2025 |
| Trade Windows Cash & Carry Limited | Extraterritorial | 2005 |
| Trailered Moves Ltd | Transport & logistics | 2025 |
| Transflor Limited | Transport & logistics | 2008 |
| Transpela Limited | Transport & logistics | 2020 |
| Transport for YOU Ltd | Transport & logistics | 2019 |
| Transport-Uk Ltd | Transport & logistics | 2020 |
| Travel Phoenix Limited | Wholesale & retail | 2019 |
| Travellers Rest Leverton Limited | Hospitality | 2014 |
| Trench Town Leisure Ltd | Wholesale & retail | 2025 |
| Trenzyblogs Limited | Wholesale & retail | 2025 |
| Trevor Howsam Limited | Other services | 1972 |
| Trevor Lineham (Shellfish) Limited | Agriculture & fishing | 2000 |
| TRI Vision Consultancy Ltd | Professional & scientific | 2023 |