| Heathland España Ltd | Professional & scientific | 2026 |
| Heathpark Limited | Construction | 1991 |
| Heatsafe GAS and Plumbing Ltd | Construction | 2016 |
| Heavy Right Foot Records Limited | Information & communication | 2022 |
| Helen Jones School Improvement Services Ltd | Education | 2018 |
| Helen Longstaff Consulting Limited | Education | 2020 |
| Heley's Clearances Ltd | Water & waste | 2023 |
| Hellfire Exotics Ltd | Wholesale & retail | 2025 |
| Hello Consultants Ltd | Other services | 2016 |
| Hello Recruitment Associates Ltd | Administrative & support | 2017 |
| Hellotmrw Ltd | Information & communication | 2024 |
| Helmm Ltd | Administrative & support | 2004 |
| Hemel Hempstead Town Football Club Limited | Extraterritorial | 1996 |
| Henkan Management Consultancy Ltd. | Professional & scientific | 2015 |
| Henston Limited | Professional & scientific | 2004 |
| HER Hair Studio Ltd | Education | 2019 |
| Hereford United Football Club Limited | Arts & recreation | 2018 |
| Hero Ventures (Uppingham) Limited | Administrative & support | 2016 |
| Heron Place Management Limited | Households | 2010 |
| Herown Limited | Professional & scientific | 1964 |
| Herta Car Smart Limited | Other services | 2017 |
| Hertfordshire Custom Joinery Ltd | Construction | 2020 |
| Hertfordshire RAW Dog Food Ltd | Wholesale & retail | 2022 |
| Herts Lawns Limited | Administrative & support | 2006 |
| Hertsmere Group Services Ltd | Other services | 1985 |
| Hibernia Contracting Limited | Professional & scientific | 2014 |
| Hico - the Human Intelligence Company Limited | Professional & scientific | 2025 |
| Higgs Consulting Limited | Information & communication | 2014 |
| High C'S Limited | Professional & scientific | 2025 |
| High Havens Management Limited | Households | 2017 |
| High Voltage Consulting Ltd | Information & communication | 2022 |
| Highbury Brickwork Ltd | Construction | 2020 |
| Higher Studies Consultant Limited | Administrative & support | 2025 |
| Highfield Machine Hire Limited | Administrative & support | 2010 |
| Highmoor Management Company Limited | Households | 1989 |
| Hill Cars Limited | Wholesale & retail | 2015 |
| Hill Health Ltd | Health & social care | 2022 |
| Hillcrest Flats (High Wycombe) Limited | Households | 1971 |
| Hillsenior Limited | Professional & scientific | 2016 |
| Himalaya 25 Limited | Hospitality | 2025 |
| Himalaya 99 Ltd | Hospitality | 2021 |
| Himley Court Freehold Limited | Households | 2025 |
| Hinds Court RTM Company Limited | Households | 2023 |
| Hinton Consultancy Ltd | Professional & scientific | 2025 |
| Historia Education Limited | Education | 2014 |
| HK Insperon Solutions Limited | Wholesale & retail | 2020 |
| HL Hose Supplies Ltd | Manufacturing | 2020 |
| HLC Wellness Ltd | Education | 2025 |
| HLG Consultancy Limited | Professional & scientific | 2026 |
| HLW Property Limited | Real estate | 2021 |
| HML Coaching Limited | Administrative & support | 2016 |
| Hobbs Automation Limited | Information & communication | 2024 |
| Hobbs Transport Consulting Ltd | Professional & scientific | 2019 |
| Hockleys Professional Limited | Professional & scientific | 1989 |
| Hockliffe House Limited | Real estate | 1999 |
| Hockliffe Surveys Limited | Construction | 2014 |
| Hoddesdon Villas Management Company Limited | Households | 2004 |
| Holidays.Blackfriday Limited | Information & communication | 2022 |
| Holin Ltd | Information & communication | 2021 |
| Holistic Rebalance Ltd | Health & social care | 2024 |
| Hollingsworthproperties Ltd | Real estate | 2025 |
| Hollner Limited | Real estate | 2021 |
| Holly House Management Company (Garden Hedge) Limited | Real estate | 2009 |
| Holly Kielty Limited | Professional & scientific | 2022 |
| Holly Tree Consulting Limited | Professional & scientific | 2024 |
| Holm Oak Consulting Ltd | Information & communication | 2025 |
| Holmans Place 2 Management Limited | Households | 2016 |
| Holmes and Company (Leighton Buzzard) Limited | Administrative & support | 2013 |
| Holroyds Residential Limited | Real estate | 2015 |
| Holtspur Estate Management Limited | Households | 1975 |
| Home Counties IT Limited | Wholesale & retail | 2005 |
| Home Counties Plumbing & Heating Limited | Construction | 2025 |
| Home-Start Bedfordshire | Health & social care | 2005 |
| Hone-All Precision Limited | Manufacturing | 1994 |
| Honeywick Scaffolding Limited | Construction | 2021 |
| Hoop Video Ltd | Information & communication | 2020 |
| Hope Rebuild Consultants Ltd | Professional & scientific | 2023 |
| Hopkinson Software Limited | Information & communication | 2025 |
| Horizon Technologies Ltd | Professional & scientific | 2016 |
| Horsebox Maintenance Ltd | Wholesale & retail | 2013 |
| Horses Helping People C.I.C. | Health & social care | 2006 |
| Horton House Estate Management Ltd | Households | 2010 |
| Horton Road (Datchet) Management Company Limited | Households | 1984 |
| Hotpod Yoga Cheltenham Limited | Arts & recreation | 2023 |
| House of BBQ Innovations Ltd | Wholesale & retail | 2020 |
| House of Coffee Limited | Manufacturing | 2006 |
| House Osteopathy Limited | Health & social care | 2025 |
| Howard Allen Services Limited | Professional & scientific | 2025 |
| Howard Bros Classics & Paint Limited | Wholesale & retail | 2026 |
| Howard Hospitality Group Ltd | Hospitality | 2024 |
| Howard Sandcliffe Investments 3 Limited | Financial services | 2007 |
| Howe to Consultancy Limited | Education | 2022 |
| Howper 260 Limited | Professional & scientific | 1991 |
| HPC (South) Limited | Manufacturing | 2012 |
| HR Quantity Surveying Limited | Other services | 2018 |
| HT GEO Ltd | Administrative & support | 2021 |
| HTC Trans Ltd | Transport & logistics | 2020 |
| Hugh Henry Limited | Real estate | 1992 |
| Hunt Accountancy Services Limited | Professional & scientific | 2006 |
| Hunt Fitness Digital Limited | Information & communication | 2024 |