| Glenair International Limited | Extraterritorial | 1999 |
| GO4 Consulting Ltd | Construction | 2002 |
| Goodnight Ginger Limited | Professional & scientific | 1995 |
| Goodwood Furniture Design Ltd | Manufacturing | 2003 |
| Grassmoor Glass Limited | Manufacturing | 2003 |
| Graysports Limited | Arts & recreation | 2007 |
| Greenwood Building Contractors (Mansfield) Limited | Wholesale & retail | 1987 |
| Greenwood Healthcare Ltd | Health & social care | 2005 |
| GTR Couriers Ltd | Transport & logistics | 2017 |
| Guardian GAS UK Limited | Construction | 2007 |
| H.P.M. Limited | Manufacturing | 1989 |
| H.S.Hodgson(Scarborough)Limited | Wholesale & retail | 1948 |
| Hallmark Tape Printers Limited | Extraterritorial | 2003 |
| Handicentre (Bingham) Limited | Wholesale & retail | 1975 |
| Handiwork Productions Limited | Arts & recreation | 2024 |
| Hannah Cotton Limited | Wholesale & retail | 2025 |
| Hardwell Homes Ltd | Real estate | 2025 |
| Hardy Electrical Limited | Construction | 2003 |
| Harp Property Group Ltd | Real estate | 2025 |
| Harts Chemist Limited | Wholesale & retail | 2003 |
| Harveys Investment & Asset Management Ltd | Professional & scientific | 2022 |
| Hasan ALI Ltd | Hospitality | 2026 |
| Havi Technologies Limited | Information & communication | 2001 |
| Hawley and Barry Building Contractors Limited | | 1985 |
| Helicon Business Development Services Limited | Professional & scientific | 1991 |
| Hengral Limited | Wholesale & retail | 2007 |
| Heritage Properties (East Midlands) Limited | Real estate | 2006 |
| Hewitt Card Ltd | Professional & scientific | 2007 |
| Highland Leather Limited | Wholesale & retail | 1999 |
| Hill Engineering Consultants Limited | Other services | 2006 |
| Hinchliffe Accountancy Services Ltd | Professional & scientific | 2002 |
| Hollybeck Nurseries Limited | Professional & scientific | 2007 |
| Home Farm Management (2010) Limited | Households | 2010 |
| Horizon Talent Acquisition Ltd | Professional & scientific | 2024 |
| Horological Enterprises Limited | Wholesale & retail | 1993 |
| Horseboxes.Com Limited | Arts & recreation | 2012 |
| Hot OR NOT Limited | Wholesale & retail | 2000 |
| Hothouse Theatre | Arts & recreation | 2008 |
| Howard Smith Electrical Services Limited | Construction | 1988 |
| HQN Financial Management Limited | Financial services | 2005 |
| Human Impact Solutions Ltd | Administrative & support | 2016 |
| Hungerhill Trading Limited | Real estate | 1999 |
| Hy-Ram Engineering Company Limited | Manufacturing | 1970 |
| Hy-Ram Pipeline Products Ltd | Extraterritorial | 1976 |
| Hyvale Power Equipment Limited | Wholesale & retail | 1979 |
| Iageo Limited | Professional & scientific | 2004 |
| IAN Wilding Associates Limited | Professional & scientific | 2004 |
| Iemporium Limited | Extraterritorial | 2006 |
| Ignis Bellator Ltd | Construction | 2019 |
| Infotex Europe Ltd | Administrative & support | 2003 |
| INK IT Black Limited | Other services | 2022 |
| Innova House Health Care Limited | Administrative & support | 2006 |
| Inogen Ltd | Information & communication | 2003 |
| Installation & Maintenance Services Limited | Construction | 2003 |
| Instant Access Platforms Limited | Administrative & support | 2000 |
| Interior Elegance (Properties) Limited | Wholesale & retail | 1991 |
| Investment & Retirement Solutions Ltd | Financial services | 2009 |
| Isbest Limited | Real estate | 2007 |
| Izon IT Management Limited | Information & communication | 2008 |
| J : D Opticians Limited | Health & social care | 2005 |
| J B Langley Consulting Ltd | Administrative & support | 2022 |
| J B Langley Planning & Design Studio Ltd | Professional & scientific | 2018 |
| J D C F Limited | Professional & scientific | 2001 |
| J Machin & Sons Limited | Professional & scientific | 2001 |
| J P Middleton (Holdings) Limited | Professional & scientific | 1999 |
| J R Developments (Carlton) Limited | Real estate | 2006 |
| J R Taxis (Newark) Limited | Arts & recreation | 1995 |
| J S Leisure Limited | Wholesale & retail | 2003 |
| J.D. Ross Limited | Agriculture & fishing | 2004 |
| J.E. Broadberry & SON Limited | Agriculture & fishing | 1982 |
| J.F.F. (Properties) Limited | Real estate | 1980 |
| J.H. Masding & SON Limited | Wholesale & retail | 1976 |
| J.R. Windows Limited | Construction | 2000 |
| Jaam Investment Limited | Health & social care | 2014 |
| Jabez Housing Associates Limited | Real estate | 1993 |
| Jacksdale Garden Centre Limited | Wholesale & retail | 2001 |
| Jamia Al-Karam | Education | 2006 |
| JAQ Creative Limited | Professional & scientific | 2007 |
| JB Fuses Limited | Professional & scientific | 2003 |
| Jeff Howarth Limited | Construction | 1999 |
| Jera Stores Limited | Wholesale & retail | 2017 |
| Jernberg Limited | Construction | 2007 |
| Jerry Gadhia Limited | Professional & scientific | 2005 |
| JET Joinery Supplies Limited | Manufacturing | 2002 |
| John Harrison (Worksop) Limited | Professional & scientific | 1996 |
| John Pacey-Lowrie Ltd | Health & social care | 2006 |
| Jollys (Mansfield) Limited | Administrative & support | 1998 |
| Jonathan Pearson Engineering Limited | Professional & scientific | 2002 |
| Jones Embroidery & Design Limited | Manufacturing | 2003 |
| Jpjs Limited | Administrative & support | 2007 |
| Jrp-Simplesolutions Limited | Professional & scientific | 2006 |
| JRW Developments Ltd. | Professional & scientific | 2000 |
| K & M Tomlinson Limited | Construction | 2005 |
| K C L Joinery Limited | Construction | 2006 |
| K H Systems Limited | Information & communication | 2007 |
| Katewyn Limited | Real estate | 2006 |
| Katherines Super Clean Ltd | Administrative & support | 2021 |
| KCC (Nottingham) Limited | Hospitality | 1998 |
| Kearnby Designs Ltd | Financial services | 2023 |
| Kelly Forrest Research Limited | Professional & scientific | 2023 |