| HER Mission Ltd | Professional & scientific | 2019 |
| Herefordshire and Worcestershire Arts Development Limited | Arts & recreation | 1997 |
| Hext Construction Limited | Construction | 1987 |
| HEY HO Limited | Arts & recreation | 2013 |
| Hiawatha Avionics Ltd | Professional & scientific | 2026 |
| High Groove Limited | Arts & recreation | 2022 |
| Higher Planes Ltd | Manufacturing | 2025 |
| Highfeld Ltd | Real estate | 2024 |
| Highfield Garage and Recovery Limited | Wholesale & retail | 2007 |
| Highway Inc. Ltd. | Information & communication | 2002 |
| Hill Barton Barns Management Company Limited | Households | 2019 |
| Hillbrow Residential Care Home Limited | Health & social care | 2002 |
| Hills Properties (Devon) Limited | Real estate | 2025 |
| Hillside (Lapford) Management Company Limited | Households | 2016 |
| Hiya Limited | Extraterritorial | 2011 |
| Holistic Ursine Limited | Education | 2023 |
| Holistix in the Green House Ltd | Wholesale & retail | 2017 |
| Holme Consultants Ltd | Professional & scientific | 2006 |
| Holmwood Property Investments Ltd | Real estate | 2003 |
| Holwell Barton Limited | Agriculture & fishing | 2010 |
| Home Hub South West Ltd | Construction | 2024 |
| Hope Springs Eternal Ltd | Professional & scientific | 2025 |
| Horton Barrow Limited | Education | 2019 |
| Hosegood Farm Services Ltd | Agriculture & fishing | 2022 |
| Houldsworth Ltd | Financial services | 1945 |
| Howliv Limited | Wholesale & retail | 2011 |
| HR2U Ltd | Administrative & support | 2022 |
| Htde Limited | Real estate | 2020 |
| Huish Horseboxes Ltd | Wholesale & retail | 2026 |
| Hulk Material Handling Limited | Water & waste | 2026 |
| Huluppu Design Ltd | Professional & scientific | 2020 |
| Hunt's Agricultural Service and Restorations Ltd | Manufacturing | 2023 |
| Huttner Ltd | Information & communication | 2014 |
| HWM Consulting Limited | Professional & scientific | 2000 |
| Hydro FLO Environmental Ltd | Administrative & support | 2010 |
| Hydro-Flo Ltd | Extraterritorial | 2012 |
| I&D Commercials Ltd | Wholesale & retail | 2024 |
| I&D Recovery Ltd | Transport & logistics | 2026 |
| I.M.B.C. (Exeter) Limited | Construction | 2001 |
| Icefall Limited Liability Partnership | | 2005 |
| Ideagala Limited | Administrative & support | 2024 |
| Idepend Ltd | Construction | 2003 |
| Ilex Software Ltd | Information & communication | 2017 |
| Illuminate TMC Ltd | Professional & scientific | 2015 |
| Ilyas Syed Limited | Manufacturing | 2016 |
| Important Projects Ltd | Information & communication | 2019 |
| Infinity Biocatalyst Limited | Manufacturing | 2025 |
| Inox Process Engineering Limited | Manufacturing | 2019 |
| Instacare Systems Limited | Manufacturing | 2013 |
| Integrated Care (Sussex) Limited | Hospitality | 1995 |
| Integrated Care Limited | Hospitality | 1990 |
| Integrity Consulting Solutions Limited | Professional & scientific | 2019 |
| Intelligent Trainer Limited | Health & social care | 2013 |
| Interactions Unlimited Limited | Health & social care | 2011 |
| Interior Fit SW Limited | Administrative & support | 2023 |
| Irene & Jenny Ltd | Manufacturing | 2022 |
| Irido Contracting Limited | Construction | 2020 |
| Irido Limited | Real estate | 2015 |
| IT Happens SW Ltd | Construction | 2021 |
| Izzyalbex Ltd | Wholesale & retail | 2009 |
| J & D Adams Optical Ltd | Wholesale & retail | 2012 |
| J & R Vehicles Limited | Wholesale & retail | 2026 |
| J & V Pittman Ltd | Health & social care | 2011 |
| J a D Services SW Limited | Construction | 2012 |
| J a Harris Electrical Ltd | Construction | 2026 |
| J and J Roofing and Cladding Limited | Construction | 2013 |
| J Coates Electrical Ltd | Construction | 2023 |
| J G Stagg Painting & Decorating Ltd | Construction | 2014 |
| J KUC Construction Limited | Construction | 2014 |
| J S Baylis Limited | Administrative & support | 2018 |
| J Tydeman Roofing Ltd | Construction | 2026 |
| J.A.G. Management and Consultancy Services Ltd | Professional & scientific | 2015 |
| J.D. Property (Devon) Limited | Real estate | 2006 |
| James Luke Limited | Wholesale & retail | 2020 |
| James Tuckett Ltd | Professional & scientific | 2020 |
| Jardin Essences Ltd | Manufacturing | 2020 |
| Jawd Properties Limited | Real estate | 2013 |
| JB Mechanic Services Ltd | Wholesale & retail | 2025 |
| JCB Construction South West Ltd | Construction | 2022 |
| JCP Carpentry & Building Services Ltd | Construction | 2017 |
| JDH Rail and Metro Consultancy Ltd | Transport & logistics | 2014 |
| JDV Capital Limited | Real estate | 2022 |
| Jemima Properties Ltd | Real estate | 2015 |
| JET Devon Limited | Extraterritorial | 2013 |
| JFS Works Limited | Wholesale & retail | 2004 |
| Jill Ireland Limited | Health & social care | 2010 |
| JKP Consultant (Cornwall) Limited | Professional & scientific | 2020 |
| John Cowell Associates Ltd | Information & communication | 2000 |
| John Curtis Plumbing Services Limited | Construction | 2018 |
| Johnsland Group Ltd | Agriculture & fishing | 2008 |
| Johnson's Leasehold Ltd | Real estate | 2025 |
| JON Bradford Electrical Ltd | Construction | 2021 |
| JON Houghton Limited | Financial services | 2013 |
| Joy Gift Publishing Limited | Information & communication | 2024 |
| JTA Building & Plastering Limited | Construction | 2015 |
| Julian Moore Design Limited | Professional & scientific | 2022 |
| Jurassic Tree Services Limited | Administrative & support | 2018 |
| Just Gents (York) Limited | Other services | 2008 |
| JW Gardening Services Ltd | Administrative & support | 2025 |
| JW Pharmacovigilance Consulting Limited | Professional & scientific | 2022 |