| High Definition Energy Systems Ltd | Construction | 2026 |
| High Leasing and Finance Ltd | Construction | 2019 |
| High Performance Systems Ltd | Manufacturing | 2022 |
| High Spec Door Solutions Limited | Construction | 2017 |
| High Standard Clearance Services Limited | Water & waste | 2020 |
| Highbank Property Services Ltd | Administrative & support | 2010 |
| Highbury Hygiene Ltd | Health & social care | 2023 |
| Highbury Transport and Logistics Limited | Transport & logistics | 2020 |
| Highcrest Group Ltd | Construction | 2025 |
| Highcroft Management Company Limited | Professional & scientific | 1984 |
| Highfield Convenience Store Ltd | Wholesale & retail | 2025 |
| Highroad Media Limited | Professional & scientific | 2022 |
| Hightown Leyes Homes Ltd | Real estate | 2021 |
| Hijinks Tattoo Club Ltd | Arts & recreation | 2019 |
| Hili Coffee House (UK) Limited | Wholesale & retail | 2018 |
| Hillcrest Property Lets Limited | Real estate | 2021 |
| Hillery Murphy Consultants Ltd | Agriculture & fishing | 2016 |
| Hinton House Investments Limited | Financial services | 2024 |
| Hiplar Limited | Real estate | 2012 |
| Hips Finder Ltd | Other services | 2005 |
| HIQ Construction Limited | Construction | 2024 |
| Hire Wear International Limited | Wholesale & retail | 2007 |
| History in the Making Films Limited | Other services | 2015 |
| History in the Making Ltd | Other services | 2003 |
| Hitchin Music Classes Limited | Education | 2023 |
| Hitesh Hirani Interest Account Limited | Other services | 2022 |
| Hjem Ltd | Wholesale & retail | 2025 |
| HJK Homes Ltd | Real estate | 2022 |
| HJM Electricals Ltd | Construction | 2019 |
| Hjrcomposites Ltd | Manufacturing | 2026 |
| HJT Stretch Limited | Wholesale & retail | 2023 |
| HK Hydrology Ltd | Professional & scientific | 2021 |
| HKB Installation Ltd | Manufacturing | 2005 |
| Hkdm Bespoke Ltd | Professional & scientific | 2024 |
| HLS Lift Services Ltd | Professional & scientific | 2022 |
| HMH Networks Limited | Information & communication | 2024 |
| HND Consulting Limited | Professional & scientific | 2018 |
| Hobart Planning Ltd | Professional & scientific | 2024 |
| Hobby Close 1967 Limited | Extraterritorial | 2014 |
| Hoblyn Agricon Limited | Wholesale & retail | 2016 |
| Hobs Composites Ltd | Manufacturing | 2026 |
| Hockaday Limited | Information & communication | 2019 |
| Hodgson Medical Services Limited | Health & social care | 2017 |
| Hodhod Press Limited | Information & communication | 2024 |
| Hogan Fleming Limited | Other services | 2016 |
| Hola Camps Ltd | Education | 2025 |
| Holador Holdings Ltd | Financial services | 2025 |
| Holdarch Limited | Real estate | 1988 |
| Holdway Homes Limited | Real estate | 2018 |
| Holken Design Ltd | Manufacturing | 2011 |
| Holley Removals Limited | Transport & logistics | 2018 |
| Holly Tree Cars Limited | Wholesale & retail | 2011 |
| Holman Propertys Ltd | Real estate | 2020 |
| Holmes-Smith Properties Ltd | Households | 2017 |
| Holyghost Community Health Care Limited | Health & social care | 2022 |
| Home & Bargains Limited | Wholesale & retail | 2025 |
| Home Building Renovations Ltd | Construction | 2018 |
| Home Care Connect Limited | Health & social care | 2022 |
| Home Counties Heating & Maintenance Limited | Other services | 2012 |
| Home County Building Services Limited | Construction | 2005 |
| Home Elite Interiors Limited | Administrative & support | 2007 |
| Home Hub Lettings Ltd | Real estate | 2025 |
| Home Sweet Home South Coast Properties Ltd | Professional & scientific | 2023 |
| Home to FC Limited | Arts & recreation | 2023 |
| Homefinder Lincs Limited | Real estate | 2025 |
| Homemerry Ltd | Real estate | 2009 |
| Homes by TEE Ltd | Real estate | 2025 |
| HOMES4U Limited | Real estate | 2018 |
| Homescape Construction Ltd | Construction | 2026 |
| Homestead Cleaning Solutions Ltd | Administrative & support | 2022 |
| Homestead Property Solutions Ltd | Construction | 2021 |
| Honeyco Limited | Real estate | 2021 |
| Honeycomb B2B Ltd | Real estate | 2016 |
| Honeywhite Homes Ltd | Real estate | 2025 |
| Honeywood Group Limited | Real estate | 2017 |
| Hoopoe Games Ltd | Information & communication | 2022 |
| HOP Kings Limited | Manufacturing | 2021 |
| Horizon JOB Ltd | Professional & scientific | 2018 |
| Horndean Consulting Limited | Professional & scientific | 2025 |
| Horndean Electrical Ltd | Construction | 2025 |
| Horndean Fish and Chips Ltd | Hospitality | 2020 |
| Horndean Football Club Limited | Arts & recreation | 2018 |
| Horndean Indian Cottage Ltd | Hospitality | 2021 |
| Horndean Lock and Key Limited | Wholesale & retail | 2025 |
| Horndean M O T Centre Limited | Wholesale & retail | 2009 |
| Horndean Plumbing & Heating Services Limited | Households | 2002 |
| Horndean Tyres Ltd | Wholesale & retail | 2011 |
| Horsley Holdings (Property) Ltd | Real estate | 2025 |
| Horton Heath Van Centre Ltd | Wholesale & retail | 2005 |
| Hoskin Carpentry Ltd | Construction | 2024 |
| Hot to Trot Transport Ltd | Transport & logistics | 2025 |
| Hotel Launchpad Ltd | Information & communication | 2023 |
| Hotten Technology Group Limited | Information & communication | 2025 |
| Hottop Ltd | Wholesale & retail | 2024 |
| Houghton Holdings (Southsea) Limited | Administrative & support | 2020 |
| Houghton's Autos Limited | Wholesale & retail | 2017 |
| Hounsell Commercial Aluminium Ltd | Construction | 2012 |
| House of BEE Limited | Arts & recreation | 2025 |
| House of Cassidy Lifestyles Ltd | Wholesale & retail | 2024 |
| House of Glam HQ Ltd | Education | 2024 |