| Graves Developments Limited | Construction | 2011 |
| Gray Panda Limited | Real estate | 2024 |
| Gray's Consolidated Services Ltd | Real estate | 2021 |
| Green MAN Community Hub CIC | Hospitality | 2026 |
| Green PEA Processing Limited | Manufacturing | 2010 |
| Greenland Workflow Solutions Ltd | Information & communication | 2025 |
| Greenvista Energy Ltd | Energy | 2023 |
| Greenwich House Independent School, Kindergarten & Creche Ltd | Education | 2026 |
| Gregory Engineering Consultants Ltd | Professional & scientific | 2025 |
| Grill Boyz Ltd | Hospitality | 2026 |
| Grimsby EAR Care Limited | Wholesale & retail | 2022 |
| Grippy Sports Ltd | Wholesale & retail | 2022 |
| Grishele Ltd | Construction | 2013 |
| Grosvenor Management Services Ltd | Administrative & support | 2023 |
| GRS Signs Ltd | Manufacturing | 2015 |
| GT Commercial Services Ltd | Construction | 2022 |
| Gunnelgate House Ltd | Agriculture & fishing | 2018 |
| H Pawson & SON Ltd | Agriculture & fishing | 2026 |
| H W Stevenson and Sons Limited | Wholesale & retail | 2006 |
| H&J Escapes Ltd | Administrative & support | 2024 |
| H.O.T. Heating & Plumbing Limited | Construction | 2022 |
| Habib Travel Ltd | Administrative & support | 2025 |
| Hallington Farming Company Limited | Agriculture & fishing | 2002 |
| Hamilton-Cook Limited | Extraterritorial | 2008 |
| Hanby Estates Ltd | Agriculture & fishing | 1950 |
| Handley Omaas Limited | Information & communication | 2015 |
| Handleys Limited | Wholesale & retail | 2007 |
| Happy Place Golf Lounge Ltd | Arts & recreation | 2025 |
| Harrison Project and Privacy Services Ltd | Professional & scientific | 2025 |
| Harrisons Ices Limited | Hospitality | 2021 |
| Harry Laing Contracting Limited | Transport & logistics | 2018 |
| Hartley Brothers Ltd | Agriculture & fishing | 2025 |
| Hatrusberry Holdings Limited | Real estate | 2026 |
| Haugham Property Company Ltd | Real estate | 2023 |
| Haven Mill Conservation Co. Limited | Real estate | 1977 |
| Hawkeyesounds Ltd | Administrative & support | 2021 |
| Haze Technical Solutions Ltd | Manufacturing | 2020 |
| HDM Trading Ltd | Wholesale & retail | 2015 |
| Healthfull UK Limited | Extraterritorial | 2023 |
| Heavy Duty Surplus Trading Limited | Mining & quarrying | 2023 |
| Hello Darling Solutions Ltd | Administrative & support | 2024 |
| Hemswell Farmers Limited | Other services | 1980 |
| Herridge Accounting and Tax Ltd | Professional & scientific | 2012 |
| Hetse Estate Ltd | Real estate | 2022 |
| Hetse Property Ltd | Real estate | 2017 |
| Hi-Lite Signs Limited | Manufacturing | 1966 |
| HJW (Developments) Limited | Construction | 1983 |
| HJW (Holdings) Limited | Professional & scientific | 1975 |
| HMF Wholesale Ltd | Manufacturing | 1997 |
| Hobo & Co (Candles) Limited | Manufacturing | 2017 |
| Hobson Originals Limited | Professional & scientific | 1990 |
| Hobson Reconditioning Services Limited | Professional & scientific | 1992 |
| Holbeach Marsh Co-Operative Limited | Agriculture & fishing | 1993 |
| Holbeach Marsh Services Limited | Agriculture & fishing | 2001 |
| Holdsworth Rentals Ltd | Real estate | 2021 |
| Holland-Controls Services UK Limited | Professional & scientific | 2021 |
| Holton Engineering Services Limited | Professional & scientific | 2014 |
| Homelincs Limited | Information & communication | 2000 |
| Hone Apparel Ltd | Manufacturing | 2025 |
| Horncastle Property Ltd | Construction | 2025 |
| Horsie in the Hedge Limited | Information & communication | 2018 |
| Horticulture Crop Protection UK Limited | Agriculture & fishing | 2022 |
| Houses 2 Homes Ltd | Real estate | 2022 |
| HR Coach Limited | Administrative & support | 2011 |
| HRN Holdings Ltd | Financial services | 2025 |
| HSE Consulting Ltd | Administrative & support | 2013 |
| Hubbard's Hills Trust | Health & social care | 2008 |
| Hudson-Day Ltd | Manufacturing | 2021 |
| Hugotto Limited | Real estate | 2023 |
| Humber Shore Developments Ltd | Real estate | 2025 |
| Humberstone & Pulford (Aldershot) Limited | Financial services | 1965 |
| Hunting Dogs Europe Puppies Ltd | Arts & recreation | 2021 |
| I J C Car Sales Limited | Wholesale & retail | 2000 |
| I W R Operations Ltd | Professional & scientific | 2017 |
| I&J Drinks Ltd | Wholesale & retail | 2022 |
| IAN Stubbs Design Associates Limited | Professional & scientific | 2002 |
| Idfarm Ltd | Education | 2025 |
| IDG Engineering Limited | Administrative & support | 2013 |
| Ifilter Ltd | Water & waste | 2025 |
| Illuminux Consulting Ltd | Professional & scientific | 2011 |
| Innovation People Limited | Information & communication | 2008 |
| Innovo Construction Limited | Construction | 2016 |
| Inshape (Lincolnshire) Ltd | Arts & recreation | 2008 |
| Inshape Wellness Ltd | Health & social care | 2026 |
| Insights to Well-Being Ltd | Health & social care | 2020 |
| Inspire Connected Communities Trust | Education | 2015 |
| Interim Food Solutions Limited | Administrative & support | 2014 |
| Invictus Gym Limited | Arts & recreation | 2026 |
| J a Burton Roofing Ltd | Construction | 2020 |
| J and C Consultancy Limited | Health & social care | 2022 |
| J Bennett Building & Joinery Ltd | Construction | 2001 |
| J P Farming Limited | Agriculture & fishing | 2017 |
| J P M Agricultural Limited | Wholesale & retail | 2011 |
| J&L Beeton Limited | Manufacturing | 2023 |
| J&M Nails & Spa Ltd | Other services | 2022 |
| J. Melton Limited | Construction | 1974 |
| J.H. Heath Limited | Agriculture & fishing | 1955 |
| J.I.C Motors Ltd | Wholesale & retail | 2023 |
| J.R. Greenfield Limited | Agriculture & fishing | 1960 |
| J.T. Systems Limited | Construction | 1990 |