| T L Price Limited | Water & waste | 2004 |
| T Wilson Electrical Services Ltd | Construction | 2020 |
| T&L.Property Investment Ltd | Real estate | 2019 |
| T.C. & B.J. Crowden Limited | Other services | 1991 |
| T.E.A.M. JS Ltd | Health & social care | 2021 |
| T.J.G Automotive Limited | Administrative & support | 2020 |
| T.S.L Management Consultancy Limited | Professional & scientific | 2026 |
| T.W. Crowden and Daughter Limited | Water & waste | 2003 |
| T10 Consulting Limited | Administrative & support | 2014 |
| Taijo Homes Ltd | Real estate | 2025 |
| Tailor Construction Limited | Construction | 2016 |
| Takoradi Gold (Ghana) Limited | Manufacturing | 1985 |
| Takoradi Gold (International) Limited | Administrative & support | 1986 |
| TAL Media Limited | Arts & recreation | 2002 |
| Tallents Holdings Limited | Professional & scientific | 2018 |
| Tallis Autostores Limited | Wholesale & retail | 1990 |
| Tankspace Limited | Information & communication | 2021 |
| Tannhauser Consulting Limited | Information & communication | 2013 |
| Tanvic Investments Limited | Financial services | 2017 |
| Tanvic Properties Limited | Financial services | 2016 |
| Tapastuff Ltd | Wholesale & retail | 2015 |
| Tardis Telemarketing Ltd | Administrative & support | 2013 |
| Target Category Solutions Limited | Wholesale & retail | 2007 |
| Task Holdings UK Limited | Professional & scientific | 2009 |
| Taste of ITS Own Restaurants Ltd | Hospitality | 2024 |
| Tasty (Newark) Limited | Hospitality | 2020 |
| Tatmar Property Services Limited | Construction | 2017 |
| Taurus Narrowboats Limited | Manufacturing | 2005 |
| Tavern Events Ltd | Hospitality | 2021 |
| Tavern Group Properties Ltd | Real estate | 2021 |
| Taylor & Sons (Growers) Limited | Agriculture & fishing | 1930 |
| Taylor Landscaping Limited | Administrative & support | 2026 |
| Taylor's Restaurant Limited | Hospitality | 2025 |
| Taylor’S Lifestyle Ltd | Professional & scientific | 2025 |
| TB Cars Holding Ltd | Wholesale & retail | 2025 |
| TC Trading Newark Ltd | Wholesale & retail | 2022 |
| TCB Consulting Services Ltd | Construction | 2025 |
| Tchc Properties Limited | Real estate | 2018 |
| TCS Holdco Ltd | Financial services | 2023 |
| TD Newark Ltd | Professional & scientific | 2011 |
| TDZ Limited | Real estate | 2014 |
| Teaching Art Limited | Arts & recreation | 1986 |
| Teacup Media Limited | Arts & recreation | 2018 |
| Team Adkins Investment Limited | Real estate | 2024 |
| Tech MCK Ltd | Information & communication | 2022 |
| Tech-Com Express Limited | Information & communication | 1998 |
| Technical Fulfilment Limited | Transport & logistics | 2006 |
| Technocore Systems Limited | Information & communication | 2008 |
| Ted's Auto Centre Limited | Wholesale & retail | 2025 |
| Tenacity Testing Ltd | Information & communication | 2012 |
| Tenebris Limited | Real estate | 2018 |
| Tenet Solutions Limited | Professional & scientific | 2009 |
| Terracycle Midlands Ltd | Manufacturing | 2023 |
| Terry Wilshin Limited | Professional & scientific | 2003 |
| TFP Agricultural Services Ltd | Agriculture & fishing | 2012 |
| TGC Telecom Ltd | Information & communication | 2026 |
| Thai Rice Nottingham Limited | Hospitality | 2017 |
| Thames & Thistle Health Ltd | Wholesale & retail | 2026 |
| That Blind Maker Ltd | Manufacturing | 2020 |
| That Padel Club Limited | Arts & recreation | 2025 |
| THE Absolut Design Company Ltd | Administrative & support | 2022 |
| THE Adams Group Limited | Financial services | 1965 |
| THE Advocacy and Support Partnership Ltd | Health & social care | 2016 |
| THE Angel Organisation Ltd | Wholesale & retail | 2014 |
| THE Art of Beer Limited | Hospitality | 2013 |
| THE Ashurst Maltings Management Company Limited | Households | 2001 |
| THE Assembly Rooms Newark Limited | Hospitality | 2026 |
| THE Barcode Warehouse Group Limited | Manufacturing | 2021 |
| THE Barnby Road Trust | Education | 2010 |
| THE Beautiful Tour Limited | Real estate | 2022 |
| THE Bell Cleaning Company Limited | Administrative & support | 2002 |
| THE Billion Group Ltd | Extraterritorial | 2017 |
| THE Blossom Tree Salon Limited | Other services | 2021 |
| THE Blue MAN Management Co. Limited | Households | 2011 |
| THE Bramble Tree Limited | Manufacturing | 2017 |
| THE Branded Glass Company Limited | Wholesale & retail | 2024 |
| THE Branded Tile Company Limited | Manufacturing | 2019 |
| THE British Dragon Boat Racing Association | Arts & recreation | 1992 |
| THE Business Evolution Business Limited | Professional & scientific | 2007 |
| THE Busy B Movement Ltd | Administrative & support | 2025 |
| THE Carbon Prism Ltd | Professional & scientific | 2026 |
| THE Carcrowd Cafe Ltd | Hospitality | 2022 |
| THE Carcrowdar Limited | Administrative & support | 2022 |
| THE Castle Barge Ltd | Hospitality | 2014 |
| THE Centre for Management and Business Development Limited | Professional & scientific | 2013 |
| THE Chapters Method Limited | Extraterritorial | 2026 |
| THE Coach House Hollingwood Limited | Real estate | 2020 |
| THE Community Coaching Company CIC | Education | 2017 |
| THE Cooperage Management Company Limited | Households | 1997 |
| THE Cozi LOG Company Ltd | Wholesale & retail | 2023 |
| THE Crumbly BUN Newark Ltd | Hospitality | 2025 |
| THE Curtain and Blind Specialist Ltd | Wholesale & retail | 2023 |
| THE Deli at NO 4 Limited | Wholesale & retail | 2019 |
| THE Digital Coach Limited | Administrative & support | 2018 |
| THE Dog Nuts Ltd | Administrative & support | 2026 |
| THE Dovecote Inn Laxton Ltd | Hospitality | 2025 |
| THE Dragon's Nook Limited | Wholesale & retail | 2025 |
| THE Effective Law Group Ltd | Professional & scientific | 2016 |
| THE ELM Tree - Hundleby Limited | Hospitality | 2014 |
| THE Envelope People Limited | Wholesale & retail | 2023 |