| Horizon Care (South West) Ltd | Health & social care | 2006 |
| Horizon Consulting Engineers Limited | Professional & scientific | 2012 |
| Horizon Leisure Products Ltd | Wholesale & retail | 1999 |
| Horndon Field Management Company Limited | Households | 2022 |
| Horrabridge Stores Limited | Wholesale & retail | 2007 |
| Horselake Management Committee Ltd | Households | 2026 |
| Horson Farms Limited | Agriculture & fishing | 2000 |
| Hose Solutions Limited | Manufacturing | 2008 |
| Hose-Equip Limited | Manufacturing | 1996 |
| Hospiscare | Health & social care | 1987 |
| Hospiscare (Shops) Limited | Wholesale & retail | 1987 |
| Hosted Desktop UK Limited | Information & communication | 2010 |
| Hot Banana Ltd | Hospitality | 2025 |
| Hot Milk Media Ltd | Information & communication | 2010 |
| Hot Reports Limited | Health & social care | 2023 |
| Hot Rock Group Ltd | Manufacturing | 2009 |
| Hot Rock Touring Productions Ltd | Arts & recreation | 2022 |
| Hot Rods and Harlots Hair Parlour Ltd | Other services | 2013 |
| Hot Spot Lighting Limited | Information & communication | 2016 |
| Hotcell Ltd | Manufacturing | 2022 |
| Hotel Bristol (Newquay) Limited(The) | Hospitality | 1933 |
| Hotrema Limited | Construction | 2023 |
| Hoult Consulting Limited | Professional & scientific | 2007 |
| House of Equinox Limited | Construction | 2024 |
| House of Magnetix Promotions Limited(The) | Wholesale & retail | 1986 |
| House of SOL Ltd | Professional & scientific | 2020 |
| House of YOU Ltd | Other services | 2021 |
| House Recruiting Limited | Administrative & support | 2021 |
| House to Home (South West) Ltd | Construction | 2022 |
| House Wash Pro Ltd | Administrative & support | 2021 |
| House-It Limited | Transport & logistics | 2007 |
| Houselets Limited | Real estate | 2002 |
| Housemaids Limited | Administrative & support | 2026 |
| Housen Estates Limited | Real estate | 2024 |
| Houses for Students Ltd | Real estate | 2017 |
| Houses for Students Partnership LLP | | 2017 |
| Houston Economic Consulting Ltd | Professional & scientific | 2012 |
| Hover Marine Limited | Wholesale & retail | 2002 |
| HOW 2 Outsource Ltd | Administrative & support | 2013 |
| HOW NOW Dairy Ltd | Agriculture & fishing | 2016 |
| HOW on Earth Vegan Limited | Hospitality | 2017 |
| Howard Financial Services Limited | Financial services | 2002 |
| Howard Foster Building Services Ltd | Construction | 2018 |
| Howell Trading Ltd | Education | 2023 |
| Howlett Property Ltd | Real estate | 2020 |
| Howmet Limited | Manufacturing | 1991 |
| HP and SON Construction and Restoration Ltd | Construction | 2023 |
| HP Apartments Limited | Real estate | 2017 |
| HP Bright Ideas Ltd | Education | 2006 |
| HP Dudley (DY1) Limited | Real estate | 2022 |
| HP Priory Payg Car Park Ltd | Hospitality | 2023 |
| HP Property Management Ltd | Real estate | 2013 |
| HP Squared Radiation Protection Services Limited | Other services | 2010 |
| HP2 Management Ltd | Households | 2015 |
| HPS Signs Ltd | Administrative & support | 2015 |
| Hrsl Properties Ltd | Real estate | 2025 |
| Hspot Ltd | Hospitality | 2022 |
| HSZ Homes Ltd | Real estate | 2022 |
| HT Ecology Limited | Professional & scientific | 2017 |
| Hub 9 Group Limited | Professional & scientific | 2020 |
| Hub 9 Limited | Extraterritorial | 2009 |
| Hubb Group Ltd | Hospitality | 2016 |
| Hubgen Ltd | Professional & scientific | 2020 |
| Hubox Limited | Information & communication | 2019 |
| HUD Media Ltd | Information & communication | 2013 |
| Huddle Productions Ltd | Information & communication | 2025 |
| Hugg Haus Ltd | Financial services | 2021 |
| Hugh Mills & SON Limited | Extraterritorial | 2006 |
| Huiye Trade Limited | Wholesale & retail | 2023 |
| Hummingbird 1 Development Limited | Construction | 2019 |
| Hummingbird Homes (by Carm) Limited | Real estate | 2024 |
| Humphrey's Design Studios Limited | Professional & scientific | 2025 |
| Hungersleep Productions Ltd | Information & communication | 2010 |
| Hunt and Carter Ltd | Construction | 2017 |
| Hunter Grange Investments Ltd | Wholesale & retail | 2011 |
| Huntshaw Ltd | Financial services | 2014 |
| Huntsland Farm Holdings Ltd | Hospitality | 2020 |
| Hupa Ltd | Health & social care | 2024 |
| Hurford and Holland Heritage Ltd | Construction | 2023 |
| HUS Moose Developments Ltd | Construction | 2024 |
| Hush Property Developments Limited | Real estate | 2019 |
| Hussar Records Ltd | Wholesale & retail | 2017 |
| HUW David Orthopaedics Ltd | Health & social care | 2010 |
| HUX Capital Limited | Professional & scientific | 2016 |
| Huxlo Ltd. | Manufacturing | 2016 |
| Huxtacole Limited | Information & communication | 2010 |
| HV Community Homes Ltd | Financial services | 2026 |
| HV Developments Torquay Ltd | Financial services | 2026 |
| HV Services (SW) Limited | Construction | 2020 |
| HV Training Ltd | Arts & recreation | 2021 |
| HVP Shutters Limited | Financial services | 2025 |
| HWC Reward Ltd | Information & communication | 2014 |
| HWG Optical Limited | Health & social care | 2015 |
| HWH Associates Limited | Financial services | 2017 |
| Hybrid Quarters Limited | Arts & recreation | 2025 |
| Hybrid Repair Service Ltd | Wholesale & retail | 2022 |
| Hyclothinguk Ltd | Wholesale & retail | 2025 |
| Hyde and Seek (Exeter) Ltd | Wholesale & retail | 2015 |
| Hyde Corner Ltd | Real estate | 2023 |
| Hydon Ltd | Real estate | 2006 |