| TK Electrics (P'Boro) Limited | Construction | 2016 |
| TK Electrics Ltd | Construction | 2018 |
| TK Group Services Ltd | Construction | 2017 |
| TK Motor Group Ltd | Wholesale & retail | 2025 |
| TK Plastering & Building Services Limited | Construction | 2014 |
| TK Quality Care Ltd | Health & social care | 2026 |
| Tk-Acme Ltd | Transport & logistics | 2024 |
| TK. PVT Ltd | Health & social care | 2021 |
| TKE Global Ltd | Health & social care | 2025 |
| TKG Hospitality Ltd | Hospitality | 2025 |
| TKG Retail Limited | Wholesale & retail | 2025 |
| Tkomn Ltd | Wholesale & retail | 2019 |
| TL Labs Ltd | Information & communication | 2026 |
| TL Northampton Ltd | Hospitality | 2023 |
| TLC R US Ltd | Wholesale & retail | 2006 |
| TLC Signs and Banners Limited | Manufacturing | 2009 |
| TLC Wellness Ltd | Arts & recreation | 2026 |
| TLD Transport-Logistic-Distribution Limited | Wholesale & retail | 2014 |
| Tlit Global Services Ltd | Professional & scientific | 2021 |
| TLJ Consultants Limited | Professional & scientific | 2014 |
| Tlma Ltd | Construction | 2026 |
| TLN East Ltd | Hospitality | 2026 |
| TLN Midlands Ltd | Hospitality | 2023 |
| TLP Restaurant Ltd | Hospitality | 2023 |
| TLS Online Enterprises Limited | Professional & scientific | 2024 |
| TM CAD Design Ltd | Professional & scientific | 2018 |
| TM Cars Limited | Wholesale & retail | 2019 |
| TM Composites Ltd | Professional & scientific | 2025 |
| TM Electrical Contractors Ltd | Construction | 2014 |
| TM Interiors Limited | Wholesale & retail | 2010 |
| TM Interiors Property Limited | Real estate | 2025 |
| TM Investments Ltd | Real estate | 2018 |
| TM Peterborough Ltd | Hospitality | 2023 |
| TM Property Services (UK) Ltd | Construction | 2014 |
| TM Spices Ltd | Hospitality | 2026 |
| TM Valeting Ltd | Administrative & support | 2025 |
| TMA Capital Ventures Limited | Real estate | 2019 |
| Tmaclife Ltd | Health & social care | 2019 |
| TMC (Peterborough) Ltd | Other services | 2026 |
| TMC (Spalding) Ltd | Other services | 2025 |
| TMH Aviation Ltd | Professional & scientific | 2024 |
| TML Medical Ltd | Health & social care | 2026 |
| TML Wellness Events CIC | Health & social care | 2025 |
| TMM Properties Ltd | Real estate | 2025 |
| Tmmb Marketing Limited | Wholesale & retail | 2022 |
| Tmmb Media Ltd | Education | 2025 |
| TMN 87 Ltd | Manufacturing | 2018 |
| Tmsons Ltd | Wholesale & retail | 2024 |
| TMV Architectural Design Limited | Professional & scientific | 2009 |
| TMV Developments Limited | Construction | 2017 |
| TNG Agility Limited | Arts & recreation | 2010 |
| TNT Stefan Ltd | Transport & logistics | 2025 |
| TNV Events Ltd | Real estate | 2022 |
| TOA Apparel Ltd | Wholesale & retail | 2022 |
| Toader Trans Ltd | Construction | 2024 |
| Toast'D Bakery Ltd | Hospitality | 2024 |
| Tobexbeats Limited | Arts & recreation | 2024 |
| Today Mini Market Ltd | Wholesale & retail | 2024 |
| Today's Tomorrow HR Ltd | Administrative & support | 2020 |
| Todays Diary Ltd | Professional & scientific | 2025 |
| Todd & Frith Property Limited | Real estate | 2025 |
| Todd Farms Ltd | Agriculture & fishing | 2018 |
| Toeco Ltd | Information & communication | 2020 |
| Togair Ltd | Construction | 2017 |
| Togo Tread Ltd | Wholesale & retail | 2025 |
| TOJ Builders Ltd | Construction | 2026 |
| Token Travels Limited | Administrative & support | 2023 |
| Tokt Ventures Limited | Information & communication | 2025 |
| Tolots (Kings Lynn) Ltd | Wholesale & retail | 2006 |
| TOM Calton Ltd | Information & communication | 2016 |
| TOM Cridland Clothing Limited | Wholesale & retail | 2014 |
| TOM Flips Group Ltd | Education | 2025 |
| TOM Learoyd Ltd | Professional & scientific | 2025 |
| TOM Merchant Building Maintenance & Renovation Ltd | Construction | 2009 |
| Tomas & Agne Ltd | Other services | 2015 |
| Tomas Powroznik Ltd | Transport & logistics | 2013 |
| Tomas&Domas Ltd | Transport & logistics | 2019 |
| Tomasz K Logistics Ltd | Transport & logistics | 2022 |
| Tommic Beauty Empire Limited | Other services | 2025 |
| Tommico Limited | Financial services | 2002 |
| Toms Technical Services Ltd | Construction | 2026 |
| Tomtit Technology & Solutions Limited | Information & communication | 2025 |
| Toneham Barns Maintenance Limited | Households | 2007 |
| Tonic Business Partners Limited | Administrative & support | 2003 |
| Tonic Media Ltd | Professional & scientific | 2001 |
| Toninos Italia Ltd | Hospitality | 2024 |
| Tony Ices Ltd | Hospitality | 2024 |
| Toojays Training & HR Consultancy Limited | Professional & scientific | 2003 |
| Toolfix Joinery and Construction Supplies Limited | Wholesale & retail | 2013 |
| Toor Technologies Ltd | Wholesale & retail | 2023 |
| Top Equipment Ltd | Wholesale & retail | 2020 |
| Top G Property Solutions Ltd | Construction | 2025 |
| Top Gym Solutions Ltd | Manufacturing | 2025 |
| Top Health Limited | Health & social care | 2020 |
| Top Notch Events Limited | Arts & recreation | 2021 |
| Top Theatre Productions Ltd | Administrative & support | 2019 |
| Top Yard Rentals Limited | Real estate | 2013 |
| Top Yard School of Boxing Community Interest Company | Arts & recreation | 2026 |
| Top-Notch Construction Limited | Construction | 2025 |
| Topclass Build Ltd | Construction | 2014 |