| Heard & Stone Limited | Construction | 2012 |
| Hearfield Research Limited | Information & communication | 1992 |
| Heart Bathrooms and Boilers Ltd | Construction | 2023 |
| Hearth & Grain Ltd | Real estate | 2026 |
| Hearth Hospitality Ltd | Hospitality | 2014 |
| Heather Reed Ltd | Health & social care | 2023 |
| Heathfield Farm Investments Limited | Real estate | 2024 |
| Heathville Care Limited | Health & social care | 2018 |
| Heathville Residential Care Limited | Health & social care | 2002 |
| Heaton & Company Ltd | Professional & scientific | 2013 |
| Heaton (Residential) Limited | Real estate | 2016 |
| Heatwave Plumbing & Heating Ltd | Energy | 2019 |
| Heavy House Limited | Arts & recreation | 2015 |
| Heavy Weapons Racing Ltd | Wholesale & retail | 2024 |
| Heawood Bell Limited | Real estate | 2019 |
| Hector Stanholz Ltd | Real estate | 2017 |
| Heffter & Heffter Limited | Construction | 2009 |
| Heidi Security Limited | Administrative & support | 2016 |
| Helen Gilder Cottages Limited | Hospitality | 2025 |
| Helen Harrison Limited | Professional & scientific | 2013 |
| Helen James Consulting Limited | Professional & scientific | 2026 |
| Heliflight AOC Ltd | Transport & logistics | 2008 |
| Helios Design & Build Ltd | Construction | 2020 |
| Helios Enterprises Ltd | Construction | 2019 |
| Helix Research and Evaluation Limited | Professional & scientific | 2020 |
| Hellenic Football League Ltd | Arts & recreation | 2026 |
| Hellobot Ltd | Information & communication | 2025 |
| Helmetcity Oxford Limited | Administrative & support | 2017 |
| Helmscent Ltd | Manufacturing | 2026 |
| Helping Hand Cleaning Limited | Administrative & support | 2025 |
| HEM Consultancy (Services) Limited | Professional & scientific | 2018 |
| Heming Media Ltd | Arts & recreation | 2021 |
| Hemming Architectural and Surveying Services Limited | Construction | 2012 |
| Hemmingway + Partners Ltd. | Financial services | 2021 |
| Hemmingway Estate Ltd. | Agriculture & fishing | 2007 |
| Hemmingway Portfolio Ltd | Real estate | 2016 |
| Hemraj Consultants Limited | Professional & scientific | 2008 |
| Hendre Residents' Association Limited | Households | 1983 |
| Hendrickse DH Limited | Health & social care | 2019 |
| Henge Health Ltd | Manufacturing | 2016 |
| Hengst Consultancy Services Limited | Professional & scientific | 2017 |
| Henley Manor Water Ltd | Water & waste | 2025 |
| Henley's Engineering Services Limited | Professional & scientific | 2024 |
| Henning Aviation Ltd | Professional & scientific | 2026 |
| Henry Rivers Limited | Arts & recreation | 2018 |
| Henry Spence Homes (Newton Farm) Ltd | Construction | 2024 |
| Henry's Entrust Limited | Professional & scientific | 2017 |
| Henslow Trading Limited | Financial services | 2013 |
| Henson and Andrews Limited | Agriculture & fishing | 2015 |
| Henwick Homes Ltd | Real estate | 2024 |
| Hephae Energy Technology UK Limited | Manufacturing | 2023 |
| Herbal Medicines Regulatory Services Limited | Professional & scientific | 2017 |
| Herbert Phillips & Sons Ltd | Manufacturing | 2010 |
| Herbert Plumbers Limited | Professional & scientific | 2004 |
| Heritage and Gray Ltd | Construction | 2016 |
| Heritage Coast and Country Ltd | Real estate | 2020 |
| Heritage Dental Health Limited | Health & social care | 2010 |
| Heritage Fire Consultancy Limited | Professional & scientific | 2022 |
| Heritage Handmade Garden Collections Limited | Wholesale & retail | 2023 |
| Heritage Holiday Escapes Ltd | Real estate | 2018 |
| Heritage N10 Ltd | Real estate | 2024 |
| Heritage Plastering & Building Ltd | Construction | 2024 |
| Heritage Plastering Ltd | Construction | 2014 |
| Heritage Spice Ltd | Hospitality | 2025 |
| Heritage Vets Limited | Professional & scientific | 2023 |
| Heritage WWE Ltd. | Construction | 2024 |
| Hermetic Ltd | Professional & scientific | 2010 |
| Hermitage Automotive Limited | Administrative & support | 2026 |
| Hermitage Events Ltd | Extraterritorial | 2023 |
| Hermovals Ltd | Transport & logistics | 2025 |
| Heron Boat Club CIC | Education | 2025 |
| Heronden Apartments Management Company Limited | Households | 1975 |
| Herons Wharf Management Company Limited | Households | 2014 |
| Herrick Networks Limited | Information & communication | 2021 |
| Hesters Way Partnership Ltd. | Real estate | 1998 |
| Hetton Consultancy Ltd | Professional & scientific | 2025 |
| HEW Builders Ltd | Construction | 2018 |
| HEW Investments Ltd | Financial services | 2025 |
| Hewer Facilities Management Limited | Construction | 2006 |
| Hewer Group Holdings Limited | Financial services | 2024 |
| Hewer Group Limited | Real estate | 2016 |
| Hewlett Developments Limited | Construction | 2007 |
| Hewlett Hair Ltd | Other services | 2021 |
| Hewlett Stores Limited | Wholesale & retail | 2020 |
| Hewlett Trading Limited | Other services | 2012 |
| Hexa Storage Ltd | Transport & logistics | 2024 |
| Hexamail Limited | Information & communication | 2002 |
| Hexatuitions Limited | Education | 2023 |
| Hexe Marketing Ltd | Information & communication | 2026 |
| Hexellence Software Ltd | Information & communication | 2017 |
| Hexev Ltd | Real estate | 2024 |
| Hexiosec Limited | Information & communication | 2018 |
| Heysham Green NG Limited | Financial services | 2022 |
| Heywood Nurseries Ltd | Health & social care | 2025 |
| HFL 36 Group Limited | Financial services | 2024 |
| HFL 36 Ltip 2024 Ltd | Other services | 2024 |
| Hflbroadband Ltd | Information & communication | 2014 |
| HFM Arts Limited | Arts & recreation | 2025 |
| HHB Studios Ltd | Arts & recreation | 2025 |
| HHC Fran Commercial Ltd | Administrative & support | 2023 |