| Top Decor Derby Limited | Real estate | 2018 |
| Top Gear MOT & Service Centre Derby Limited | Wholesale & retail | 2020 |
| Top Gear MOT Centre Limited | Wholesale & retail | 2020 |
| Top GUN Paint and Alloys Limited | Wholesale & retail | 2012 |
| Top HAT Property Group Ltd | Real estate | 2019 |
| Top Kurdish Barber Ltd | Other services | 2024 |
| Top KUT Turkish Barber INT Ltd | Other services | 2023 |
| Top Marx Carpet Fitting Limited | Construction | 2019 |
| Top Nosh Caterers Limited | Hospitality | 2007 |
| Top Notch Shopfront Shutters Ltd | Construction | 2020 |
| Top PAD Properties Limited | Real estate | 2006 |
| Top Pizza Catering Ltd | Hospitality | 2023 |
| Top Pizza Derby Ltd | Hospitality | 2024 |
| Top Supply World Ltd | Wholesale & retail | 2025 |
| Topaz (Eco) Ltd | Agriculture & fishing | 2026 |
| Topcroft ETC Limited | Construction | 2023 |
| Topdec Decorating Contractors Ltd | Construction | 2022 |
| TOPGEAR24 Ltd | Wholesale & retail | 2022 |
| Topham Ecommerce Ltd | Wholesale & retail | 2024 |
| Tophat Industries Limited | Manufacturing | 2016 |
| Tophat UK Holdings Limited | Financial services | 2023 |
| Topmark Joinery Ltd | Construction | 2014 |
| Topmatch Limited | Hospitality | 2012 |
| Topro Limited | Wholesale & retail | 2010 |
| Topsham Topco Limited | Financial services | 2024 |
| Topstaff Group Limited | Administrative & support | 2023 |
| Toptouch Limited | Real estate | 2023 |
| Toptrux (Nottingham) Limited | Extraterritorial | 1990 |
| TOR Multimix Limited | Manufacturing | 2002 |
| Torchline Fire Risk Assessment Ltd | Public administration | 2025 |
| Torii Beck Ltd | Manufacturing | 2025 |
| Torpex Sports Ltd | Wholesale & retail | 2016 |
| Torro Imports Ltd | Wholesale & retail | 2021 |
| Torven Limited | Construction | 2026 |
| Tosad Global Services Limited | Wholesale & retail | 2025 |
| Tota Care Ltd | Construction | 2023 |
| Total Auto Solutions Ltd | Wholesale & retail | 2025 |
| Total Corporate Photography Ltd | Professional & scientific | 2013 |
| Total Education Quality Limited | Education | 2019 |
| Total Engineering Asset Management Limited | Manufacturing | 2018 |
| Total Fitness (Derby) Community Interest Company | Administrative & support | 2019 |
| Total FIX Tech Ltd | Construction | 2025 |
| Total Grassroots Ltd | Wholesale & retail | 2024 |
| Total Hire & Sales Limited | Wholesale & retail | 1999 |
| Total Look by Angela Ltd | Other services | 2026 |
| Total Movers Services Limited | Professional & scientific | 2022 |
| Total Property Pros Limited | Construction | 2025 |
| Total Site Accommodation Services Ltd | Construction | 2004 |
| Total Vehicle Services Nottingham Limited | Wholesale & retail | 2024 |
| Total Vehicle Servicing Limited | Wholesale & retail | 2014 |
| Totalis Ltd | Wholesale & retail | 2022 |
| Totally Aesthetic by DR VI Ltd | Health & social care | 2023 |
| Totallygrippedtyre Co Ltd | Wholesale & retail | 2019 |
| Totie Driver Ltd | Arts & recreation | 2006 |
| Totus Consulting Ltd | Information & communication | 2018 |
| Touch Holdings (UK) Limited | Financial services | 2012 |
| Touch Interior Design Limited | Construction | 2024 |
| Touch Security Ltd | Administrative & support | 2010 |
| Touch Stone Derby Ltd | Transport & logistics | 2022 |
| Touch Training Academy Limited | Education | 2012 |
| Touqeer Shah Ltd | Wholesale & retail | 2023 |
| Towai Limited | Information & communication | 2026 |
| Towan Solutions Limited | Information & communication | 2024 |
| Tower Farm Projects Limited | Real estate | 2022 |
| Tower Sanctuary Housing Association CIC | Administrative & support | 2019 |
| Towerhill Capital Limited | Real estate | 2016 |
| Towles Consultancy Limited | Information & communication | 2020 |
| Town 17 Ltd | Administrative & support | 2017 |
| Town ST Ltd | Wholesale & retail | 2021 |
| Towns & Crawford Ltd | Real estate | 2015 |
| Towns Limited | | 1973 |
| Townsville Limited | Wholesale & retail | 2010 |
| TP Aerospace Technics UK Ltd | Transport & logistics | 2018 |
| TP Automotive Ltd | Wholesale & retail | 2016 |
| TPF Consulting Limited | Professional & scientific | 2023 |
| Tple Limited | Real estate | 2019 |
| Tposh Palace Ltd | Manufacturing | 2025 |
| TPP Property Ltd Limited | Real estate | 2020 |
| TPR Haulage Ltd | Administrative & support | 2014 |
| TPS Derby Limited | Wholesale & retail | 2018 |
| TPW Electrical Contractor Limited | Construction | 2026 |
| TQ Automotive Ltd | Administrative & support | 2024 |
| TQA Group Limited | Administrative & support | 2018 |
| TR8N Holdings Ltd | Financial services | 2025 |
| TR8N Property Ltd | Real estate | 2026 |
| TRA UK Holdings Ltd | Transport & logistics | 2024 |
| Tracefeeder Ltd | Manufacturing | 2025 |
| Track Courier Limited | Transport & logistics | 2025 |
| Trackside Auto Centre INT Limited | Wholesale & retail | 2021 |
| Trackside Limited | Wholesale & retail | 1993 |
| Trade Approved Plumbing Services Ltd | Construction | 2014 |
| Trade Associations Services Limited | Other services | 2000 |
| Trade Bathroom and Tiles Limited | Wholesale & retail | 2019 |
| Trade Centres (Central) Ltd | Construction | 2018 |
| Trade Facilitation Consulting Limited | Professional & scientific | 2018 |
| Trade Refrigeration Limited | Administrative & support | 2010 |
| Trade Windows Limited | Extraterritorial | 2008 |
| Trader Capital LLP | | 2009 |
| Trader Capital Privee Ltd | Professional & scientific | 2014 |
| Tradeweb Derby Limited | Information & communication | 2014 |