| High Ridge (Sandbanks) Limited | Households | 2010 |
| High Spec Handling Ltd | Transport & logistics | 2024 |
| High Street Poole (2016) Limited | Construction | 2016 |
| High Stripe Limited | Administrative & support | 2018 |
| High TEC Catering Equipment Limited | Manufacturing | 2019 |
| High Trees (Branksome Park) Limited | Households | 1972 |
| High Trees Carpentry & Building Ltd | Construction | 2022 |
| Highbrow Place RTE Company Ltd. | Real estate | 2007 |
| Highcliffe House Developments Limited | Real estate | 2007 |
| Highcliffe Launderette Limited | Other services | 2006 |
| Highcliffe Trading Limited | Hospitality | 2002 |
| Highfield Hall (Fordingbridge) Limited | Households | 2003 |
| Highfield House Limited | Households | 2006 |
| Highlands Freehold (Wimborne) Limited | Households | 2016 |
| Highlevel Automation Ltd | Information & communication | 2026 |
| Highlife Appointments Limited | Financial services | 1992 |
| Hightree Investments Ltd | Real estate | 2020 |
| Highvalue Services Limited | Wholesale & retail | 2025 |
| Highview Freehold Limited | Households | 2016 |
| Highwater Properties Limited | Households | 1996 |
| Highwood Grove Management Company Limited | Households | 2022 |
| Hignell Baker Investments Limited | Construction | 2011 |
| Hijab Boutique Ltd | Wholesale & retail | 2021 |
| Hikaru Kitai Architects Ltd | Professional & scientific | 2005 |
| Hiko Electrical Services Ltd | Construction | 2022 |
| Hildon (SW) Ltd | Construction | 2013 |
| Hill ASH Farm Ltd | Construction | 2021 |
| Hill Park Property Management Ltd | Real estate | 2023 |
| Hill Twine Solicitors Ltd | Professional & scientific | 2014 |
| Hillbros Ventures Limited | Real estate | 2025 |
| Hillside Property Developments Limited | Construction | 2017 |
| Hillside Store Cunningham Convenience Ltd | Wholesale & retail | 2022 |
| Hillside Store Ltd | Wholesale & retail | 2022 |
| Hilltop Market Ltd | Wholesale & retail | 2023 |
| Hillview Awnings Limited | Wholesale & retail | 2012 |
| Hillview Court Management Limited | Households | 1992 |
| Hilton Grange Limited | Households | 1999 |
| Hinada Limited | Households | 2020 |
| Hindsight App Ltd | Information & communication | 2014 |
| Hinton Construction Developments Ltd | Construction | 2018 |
| Hinton Haulage Ltd | Transport & logistics | 2007 |
| Hinton Heating Limited | Construction | 2003 |
| HIS Mercy Global Services Ltd | Administrative & support | 2025 |
| Hitchings Properties Limited | Real estate | 2002 |
| Hive Gardens (Sandbanks) Limited | Professional & scientific | 1960 |
| Hive Investment Group Ltd | Real estate | 2024 |
| Hive Nest Deals Limited | Real estate | 2023 |
| Hive Nest Developments Limited | Construction | 2024 |
| Hive Nest Homes Limited | Real estate | 2023 |
| Hive Nest Stays Limited | Hospitality | 2024 |
| Hive Nest Trading Limited | Real estate | 2024 |
| HIX Investments Ltd | Real estate | 2021 |
| HJ Accounts Management Ltd | Professional & scientific | 2017 |
| HJ Purbrick Properties Ltd | Real estate | 2023 |
| Hjkl FIC Limited | Real estate | 2026 |
| HK Catering Ltd | Hospitality | 2026 |
| HK Payment Services Ltd | Financial services | 2024 |
| HK Properties (KL) Limited | Real estate | 2017 |
| Hk&Q Developments Limited | Real estate | 2016 |
| Hk&Q Property (Newton) Limited | Real estate | 2019 |
| Hkgs Enterprises Limited | Information & communication | 2012 |
| HKQ Holdenhurst Limited | Construction | 2022 |
| HL Digital Services Ltd | Professional & scientific | 2022 |
| Hmason Group Ltd | Transport & logistics | 2023 |
| HME Alliance Ltd | Health & social care | 2022 |
| HMR Employment Limited | Administrative & support | 2013 |
| HN Property (Holdenhurst) Limited | Real estate | 2021 |
| HN Property (Wiltshire) Limited | Real estate | 2020 |
| Hobart Court Management Company Limited | Households | 2003 |
| Hobbybox Gifts Ltd | Wholesale & retail | 2025 |
| Hoburne Barns Management Company Limited | Households | 2019 |
| Hockmann Limited | Professional & scientific | 2024 |
| Hocus Tattoo Lounge Ltd | Other services | 2021 |
| Hoda Services Limited | Professional & scientific | 2023 |
| Hogan Fitness Ltd | Arts & recreation | 2021 |
| Holan Catering Ltd | Hospitality | 2019 |
| Holdenhurst Road RTM Company Limited | Real estate | 2025 |
| Holdit Ltd | Manufacturing | 2017 |
| Holdroyd&Sons Ltd | Wholesale & retail | 2011 |
| Holey Moley Cafe Ltd | Hospitality | 2026 |
| Holiday in Dorset Ltd | Real estate | 2023 |
| Holiday LET My Property Ltd | Households | 2020 |
| Holiday Seekers Ltd | Administrative & support | 2024 |
| Holland Business Park Limited | Real estate | 2018 |
| Holland Park Building Ltd | Construction | 2025 |
| Hollies Management Company (Bournemouth) Limited | Households | 1995 |
| Holloway Heating Limited | Construction | 2025 |
| Hollowfx Ltd | Professional & scientific | 2023 |
| Holly Lodge (Bournemouth) Limited | Real estate | 2009 |
| Hollybush House RTM Company Ltd | Households | 2017 |
| Hollypop Limited | Hospitality | 2021 |
| Hollywood Fancy Dress Limited | Wholesale & retail | 2013 |
| Hollywood Nails (Westbourne) Ltd | Other services | 2017 |
| Holmdene Court Managing Company RTM Limited | Households | 2009 |
| Holt Engineering Recruitment Limited | Professional & scientific | 2017 |
| Holt Executive Ltd | Professional & scientific | 2016 |
| Holt Recruitment Group Limited | Professional & scientific | 2017 |
| Holt Recruitment Ltd | Professional & scientific | 2007 |
| Holt Technical Staffing Limited | Professional & scientific | 2024 |
| Holt Venture Limited | Financial services | 2015 |