| Harvey Consulting Services Ltd | Information & communication | 2021 |
| Hashpower Analytics Limited | Information & communication | 2024 |
| Hatmakers Limited | Real estate | 2020 |
| Hatton Compliance Services Limited | Administrative & support | 2024 |
| Hatton Project Services Limited | Professional & scientific | 2025 |
| Haven Addiction and Counselling Services Limited | Health & social care | 2011 |
| Haven Road Finance Limited | Professional & scientific | 2024 |
| Havencrown Builders Limited | Administrative & support | 1996 |
| Havencrown Marquee Cleaning Machines Limited | Professional & scientific | 2013 |
| Havencrown Marquee Washing Machines Limited | Extraterritorial | 2016 |
| Havermill Limited | Professional & scientific | 2004 |
| Hawkes Aviation Limited | Extraterritorial | 2021 |
| Hayden & COE Ltd | Real estate | 2025 |
| Hayes House Ltd | Construction | 2020 |
| Hayes House Twin Oaks Limited | Real estate | 2024 |
| Hayes Lane Properties Limited | Real estate | 2017 |
| Hayley Hughes Ltd | Professional & scientific | 2025 |
| Haymoor Road Freehold Limited | Households | 2009 |
| Hayter Logistics Ltd | Transport & logistics | 2023 |
| Hazel & Green Limited | Administrative & support | 2026 |
| Hazel Gardens Ltd | Administrative & support | 2023 |
| Hazelbranch Limited | Administrative & support | 2007 |
| HB Cash & Carry Limited | Wholesale & retail | 2012 |
| HBA Consultancy Limited | Information & communication | 2019 |
| HCW Consulting Ltd | Information & communication | 2026 |
| HD Electrical Contractors Limited | Construction | 2019 |
| HDC IT Consultancy Limited | Information & communication | 2016 |
| Head Data Partners Ltd | Information & communication | 2025 |
| Heads High People Ltd | Professional & scientific | 2019 |
| Headspace Creative Services Limited | Information & communication | 2015 |
| Healthcare Data Solutions Ltd | Information & communication | 2021 |
| Healthcare International Group Ltd | Financial services | 2020 |
| Healthcare International Logistics Ltd | Transport & logistics | 2018 |
| Healthcare International Research Limited | Manufacturing | 2019 |
| Heatfix Services Ltd. | Construction | 2006 |
| Heathland Residents Association Limited | Households | 1981 |
| Heathlands Livery Yard Limited | Agriculture & fishing | 2017 |
| Heavenly Daze Investments Limited | Extraterritorial | 2017 |
| Hebe Whole Fuel Ltd | Arts & recreation | 2025 |
| Heckford Developments Ltd | Construction | 2025 |
| Hedge House 2026 Limited | Real estate | 2026 |
| Hedo Limited | Wholesale & retail | 2021 |
| Hedy Innovations Ltd | Real estate | 2026 |
| Heikkila Khan Limited | Professional & scientific | 2012 |
| Heim Art Glass Supplies Ltd | Manufacturing | 2026 |
| Helen Hartley Services Limited | Administrative & support | 2016 |
| Helen J Phillips Ltd | Information & communication | 2026 |
| Helic House Limited | Households | 2004 |
| Helios Business Services Limited | Professional & scientific | 2024 |
| Helios Consultants Limited | Professional & scientific | 2024 |
| Helpful Robot Limited | Information & communication | 2021 |
| Hemsley Global Limited | Information & communication | 2020 |
| Henbury House Gardens Residents Association Limited | Households | 1998 |
| Henbury Management (Corfe Mullen) Limited | Households | 1998 |
| Hendrie & Hounds Ltd | Wholesale & retail | 2025 |
| Henley's Building & Maintenance Ltd | Other services | 2016 |
| Henley's Response Limited | Construction | 2011 |
| Henning Properties Limited | Real estate | 2018 |
| Hero-Type Ltd | Information & communication | 2024 |
| Herridge Construction Limited | Administrative & support | 2017 |
| HES Wimborne Ltd | Construction | 2011 |
| Hethpool IT Ltd | Information & communication | 2015 |
| Hetti Garwood Associates Limited | Transport & logistics | 2019 |
| Heybridge Consulting Limited | Professional & scientific | 2024 |
| HG Properties (Southern) Limited | Real estate | 2021 |
| HG Properties Dorset Limited | Construction | 2011 |
| HGB IT Limited | Information & communication | 2026 |
| HGC TEC Limited | Information & communication | 2007 |
| Hgudata Limited | Information & communication | 2015 |
| HGW (Holdings) Ltd | Real estate | 2014 |
| HGW Secretarial Limited | Professional & scientific | 2005 |
| HHR Design Services Ltd | Professional & scientific | 2023 |
| HI Tech Garage Doors Ltd | Construction | 2019 |
| HIC Ltd | Professional & scientific | 2018 |
| Hierba Limited | Real estate | 2020 |
| High Pressure Services Limited | Professional & scientific | 2010 |
| High Reach Repairs Ltd | Construction | 2024 |
| High REV Collective Limited | Wholesale & retail | 2026 |
| Highbreeze International Limited | Transport & logistics | 2004 |
| HIL Consulting Ltd | Professional & scientific | 2019 |
| Hilary Price Risk Services Ltd | Financial services | 2025 |
| Hill & SON Limited | Wholesale & retail | 1994 |
| Hill College Holdings Limited | Financial services | 2014 |
| Hillbutts Property Management Limited | Households | 2023 |
| Hillcote Properties Limited | Real estate | 2016 |
| Hillier Plant & Training Limited | Financial services | 2021 |
| Hillmans Transport Ltd | Wholesale & retail | 2013 |
| Hillwin Limited | Water & waste | 2013 |
| Hilton Editorial Ltd | Professional & scientific | 2021 |
| Hilton Offshore Services Limited | Professional & scientific | 2009 |
| Himalayan Heart Limited | Health & social care | 2014 |
| Hinkypunk Media Limited | Information & communication | 2013 |
| Hippocampus Travel Ltd | Administrative & support | 2020 |
| HIR Britain Ltd | Manufacturing | 2022 |
| HIR Global Limited | Financial services | 2023 |
| Hire Circle Ltd | Administrative & support | 2023 |
| HIS Grace Property Investments Limited | Real estate | 2020 |
| Hitech Cloud Solutions Ltd | Information & communication | 2021 |
| Hive Construction (Southern) Ltd | Extraterritorial | 2024 |
| Hive Surveying Ltd | Professional & scientific | 2023 |