| DE Vaney Boissons Ltd | Manufacturing | 2020 |
| Design TWENTY2 Ltd | Professional & scientific | 2024 |
| Diocese of Southwell and Nottingham Multi-Academy Trust | Education | 2013 |
| DO the Write Thing Limited | Health & social care | 2013 |
| DR J G Hardman Ltd | Health & social care | 2003 |
| Dragon Education and Creative Enterprises Ltd | Information & communication | 2024 |
| Eanid Ltd | Real estate | 2020 |
| Easthorpe Developments Limited | Construction | 2007 |
| Eaton Plastering & Rendering Ltd | Construction | 2020 |
| EGB Engineering Consultants Ltd | Professional & scientific | 2011 |
| Enigmatic Holdings Limited | Information & communication | 2008 |
| Envirosolv Limited | Water & waste | 2001 |
| Equilibrium Partners LLP | | 2019 |
| Eriton Securities Limited | Extraterritorial | 1957 |
| ETM Inns Ltd | Hospitality | 2023 |
| Eugh Media Ltd | Arts & recreation | 2025 |
| Every Comma Ltd | Professional & scientific | 2013 |
| Farmers Pride Limited | Wholesale & retail | 2020 |
| Feast Street Limited | Hospitality | 2025 |
| Fenton Jones Limited | Real estate | 2023 |
| Fides Praestantia P&Uss Ltd | Health & social care | 2026 |
| Fire & Life Safety Limited | Public administration | 2023 |
| Fire & Life Safety Services Limited | Public administration | 2009 |
| Fletchers Surveyors Limited | Real estate | 2007 |
| Floodboard Limited | Construction | 2024 |
| Floriam Limited | Administrative & support | 2024 |
| Fox's Toy Box Ltd | Wholesale & retail | 2021 |
| Frizzy Haych Creative Ltd | Administrative & support | 2017 |
| G.L.M. Management Company Limited | Administrative & support | 1989 |
| G.P.R. Construction Limited | Construction | 2002 |
| Gascoines Auctions Limited | Wholesale & retail | 2022 |
| Gascoines Group Limited | Agriculture & fishing | 1938 |
| Gascoines Limited | Real estate | 2022 |
| GB Early Years Consultancy Limited | Education | 2026 |
| Genesis Park Management Limited | Administrative & support | 2006 |
| Gigopolis Ltd | Professional & scientific | 2003 |
| Global Centre for Sustainable Solutions Ltd | Manufacturing | 2023 |
| Global Project Safety Ltd | Professional & scientific | 2020 |
| Goalie Wars Ltd | Arts & recreation | 2024 |
| Gollick Electrical Ltd | Construction | 2022 |
| Good Capital Ltd | Professional & scientific | 2015 |
| GPHIC2 Ltd | Professional & scientific | 2026 |
| Grand CRU Horses Limited | Extraterritorial | 1972 |
| Green Source Heating Limited | Construction | 2020 |
| Greet Inspirations Limited | Professional & scientific | 2006 |
| Grgm Rainbow Properties Limited | Real estate | 2013 |
| Grove Vale Investments Limited | Extraterritorial | 1960 |
| Hair Again Southwell Ltd | Other services | 2019 |
| Hama Ganji Ltd | Wholesale & retail | 2025 |
| Handicentre (Holdings) Limited | Financial services | 2013 |
| Happi Products Ltd | Manufacturing | 2018 |
| Harman Haulage Limited | Transport & logistics | 1970 |
| Harrison's Handmade Furniture Limited | Wholesale & retail | 2024 |
| Harrisons & Co Hospitality Ltd | Hospitality | 2025 |
| Hawkes Events Ltd | Arts & recreation | 2023 |
| Hericon Development Co. Limited | Extraterritorial | 1964 |
| Hill Farm Nurseries Limited | Wholesale & retail | 1996 |
| Hill House Lodge Management Company Limited | Real estate | 2000 |
| Hill House Southwell Limited | Households | 2001 |
| Hockerton Housing Project Ltd | Other services | 1995 |
| Hockerton Housing Project Trading Limited | Professional & scientific | 1996 |
| Hockerwood Eggs Limited | Agriculture & fishing | 2010 |
| Home 1ST Physiotherapy Limited | Health & social care | 2022 |
| Home Bake Limited | Wholesale & retail | 2015 |
| Home IS Where the Hart IS Ltd | Hospitality | 2020 |
| Homestead Builders Limited | Construction | 2003 |
| Honed Creative and Digital Ltd | Professional & scientific | 2019 |
| Hopewell Property Group Limited | Real estate | 2025 |
| Hopewell Transport Limited | Transport & logistics | 2020 |
| HTV Solutions (Southwell) Limited | Wholesale & retail | 2022 |
| Huntley Web Ltd | Information & communication | 2018 |
| I.D.C. Joinery and Building Ltd | Construction | 2023 |
| Ideal Lettings Limited | Real estate | 2016 |
| Independent Petroleum Services Limited | Administrative & support | 2003 |
| Indigo Brave Social Enterprise | Professional & scientific | 2004 |
| Inkkin Limited | Manufacturing | 2023 |
| Interkonect Services UK Ltd | Information & communication | 2003 |
| J Slack Flooring Ltd | Construction | 2021 |
| J.E. Harris & SON (Furnishers) Limited | Real estate | 1953 |
| J1 Livery Ltd | Arts & recreation | 2021 |
| J2C3 Investments Limited | Households | 2021 |
| Ja.Csc Limited | Wholesale & retail | 2026 |
| James Allen Interiors Ltd | Construction | 2019 |
| JD Wealth Management Ltd | Financial services | 2020 |
| Jeggers Ltd | Manufacturing | 2025 |
| Jenny Piercy Regulatory Services Limited | Professional & scientific | 2011 |
| JH Accountancy (Southwell) Limited | Professional & scientific | 2018 |
| Jigsaw Planning & Development Limited | Professional & scientific | 2012 |
| JLP TV Ltd | Information & communication | 2023 |
| John Harmer Management Company Limited | Real estate | 1971 |
| Jonathan Ensor Electrical Solutions Ltd | Construction | 1987 |
| Jonathan Ramsey ( Carpentry and Joinery) Limited | Construction | 2010 |
| Joseph Kemish Architects Ltd | Professional & scientific | 2010 |
| Jotwom Limited | Real estate | 2025 |
| JRL IT Consulting Ltd | Information & communication | 2018 |
| JSM Anaesthetics Limited | Health & social care | 2012 |
| JT Health & Fitness Ltd | Arts & recreation | 2020 |
| Jtfo Energy Limited | Information & communication | 2017 |
| K H Electrical (Southwell) Limited | Construction | 2017 |
| Kevin Smith Ltd | Construction | 2016 |