| HL Stocks Ltd | Wholesale & retail | 2026 |
| HLP Transport Ltd | Transport & logistics | 2018 |
| HLS Management Systems Limited | Professional & scientific | 2015 |
| HMC Housing Ltd | Real estate | 2025 |
| HMH Corpfin Limited | Information & communication | 2010 |
| HML Counselling Limited | Health & social care | 2021 |
| Hmorooms Ltd. | Real estate | 2017 |
| HMW Consultants Limited | Professional & scientific | 1997 |
| HN Transportation Ltd | Transport & logistics | 2017 |
| Hobsley Limited | Professional & scientific | 2002 |
| Hobson Hughes Limited | Professional & scientific | 1997 |
| Hobsons Choice (Kitchens & Bathrooms) Limited | Professional & scientific | 2008 |
| Hochtief (U.K.) Limited | Construction | 1990 |
| Hochtief (UK) Construction Limited | Construction | 1990 |
| Hochtief Data Centre Partner UK Ltd | Construction | 2025 |
| Hochtief E-Mobility UK Ltd | Administrative & support | 2025 |
| Hochtief JCL Holdco Limited | Administrative & support | 2026 |
| Hochtief Operations (UK) Ltd. | Construction | 2024 |
| Hochtief PPP Solutions (UK) Limited | Administrative & support | 2004 |
| Hochtief SCL Holdco Limited | Administrative & support | 2023 |
| Hochtief Solarpartner UK Ltd | Administrative & support | 2024 |
| Hock Ling Consulting Ltd | Administrative & support | 2023 |
| Hoco Maintenance Ltd | Construction | 2026 |
| Hodgesnet Ltd | Professional & scientific | 2011 |
| Hoftec Ltd | Wholesale & retail | 2020 |
| Hogg Construction Ltd | Construction | 2021 |
| Holbi Group Ltd | Information & communication | 2005 |
| Holdcroft Enterprises Limited | Real estate | 1983 |
| Holdcroft Meadows Management Limited | Real estate | 2011 |
| Holland & Farmer Engineering Limited | Manufacturing | 1993 |
| Hollanger Burke Ltd. | Professional & scientific | 1997 |
| Hollimart Services Ltd | Wholesale & retail | 2022 |
| Hollybrooke House Limited | Administrative & support | 2013 |
| Holm Oak Court Residents Association Limited | Households | 2000 |
| Holman Specialist Paints Ltd | Wholesale & retail | 1986 |
| Holmecare Services Ltd | Administrative & support | 2005 |
| Holsuk Ltd | Professional & scientific | 2025 |
| Holt Retirement Limited | Health & social care | 2009 |
| Holy Cross Catholic Primary School | Education | 2011 |
| Holy Family Catholic Primary and Nursery School | Education | 2012 |
| Holy Ghost Investments Limited | Health & social care | 2017 |
| Holy Rood Catholic Primary School | Education | 2011 |
| Home and Hedge Ltd | Construction | 2026 |
| Home Care 365 Limited | Health & social care | 2014 |
| Home Clinic Group Limited | Health & social care | 2022 |
| Home Clinic Holdings Limited | Health & social care | 2022 |
| Home Finders (Swindon) Ltd | Real estate | 2021 |
| Home From Home Property Management Swindon Limited | Households | 2016 |
| Home Propositions Limited | Information & communication | 2020 |
| Home Staging Madders Ltd | Administrative & support | 2025 |
| Home Stay Accommodation Ltd | Hospitality | 2022 |
| Home Tech Rescue Ltd | Extraterritorial | 2020 |
| Home-Vision Limited | Wholesale & retail | 2019 |
| Homebond Property Services Limited | Construction | 1994 |
| Homecom Electrical Ltd | Construction | 2025 |
| Homefeel Project Limited | Construction | 2017 |
| Homeland Property Developments Ltd | Real estate | 2018 |
| Homes and Holidays Ltd | Real estate | 2021 |
| Homes by Harfleur Limited | Real estate | 2023 |
| Homeset Property Ltd | Real estate | 2025 |
| Homestage Ltd | Construction | 2016 |
| Homestores 2020 Limited | Wholesale & retail | 2024 |
| Homestream Limited | Extraterritorial | 2008 |
| Homewoq Ltd | Education | 2025 |
| Honeycourt GP Limited | Financial services | 2017 |
| Honeycourt Partners LP | | 2017 |
| Honeysuckle Home Care Limited | Health & social care | 2020 |
| Hongxin Oriental Limited | Hospitality | 2024 |
| Hook Scaffolding Services Limited | Construction | 2000 |
| Hootvox Limited | Administrative & support | 2014 |
| Hope and Ginger Limited | Wholesale & retail | 2020 |
| Hope Carpentry Limited | Manufacturing | 2020 |
| Hope Children's Home Limited | Health & social care | 2024 |
| Hope Lucas Medical Limited | Health & social care | 2023 |
| Hope Springs - Happy Hearts Homes Ltd | Hospitality | 2024 |
| Hopley Properties Ltd | Real estate | 2023 |
| Hopley Property Accountant Ltd | Professional & scientific | 2024 |
| Hopton PV Limited | Administrative & support | 2013 |
| Horeto Ltd | Arts & recreation | 2019 |
| Horgan's Incorporated Limited | Real estate | 2018 |
| Horgans Construction Limited | Construction | 2026 |
| Horizn Golf Ltd | Wholesale & retail | 2026 |
| Horizon Cladding and Roofing Ltd | Construction | 2024 |
| Horizon Home Surveys Ltd | Real estate | 2024 |
| Horizon Mgmt Limited | Households | 2019 |
| Horizon Properties (South) Limited | Real estate | 2025 |
| Horizons Demise Limited | Arts & recreation | 2025 |
| Horler Property Group Limited | Real estate | 2020 |
| Horn Furniture (U.K.) Limited | Wholesale & retail | 1982 |
| Hornby Dublo 2000 Limited | Extraterritorial | 1998 |
| Horrell Investments Ltd | Information & communication | 2026 |
| Horse Logic Ltd | Administrative & support | 2021 |
| Horsebrook Services (Calne) Limited | Construction | 2012 |
| Horsemanship Heroes Community Interest Company | Education | 2025 |
| Horsey Herbs Limited | Professional & scientific | 2025 |
| Horsfall Turner Group Ltd | Other services | 2025 |
| Hosey Homes Developments Ltd | Extraterritorial | 2023 |
| Hoskins Heating Limited | Construction | 2018 |
| Hospitality Accomodation Ltd | Hospitality | 2016 |
| Hospitality Cuisine Ltd | Hospitality | 2016 |