| Hairology Extensions Limited | Education | 2023 |
| Halew Services Limited | Professional & scientific | 2011 |
| Hambalt Ltd | | 2026 |
| Hamblens Garage Limited | Wholesale & retail | 2004 |
| Hampshire Hogs Ltd | Manufacturing | 2005 |
| Hampshire Wellbeing Ltd | Health & social care | 2025 |
| Hampton Global Consultancy Ltd | Financial services | 2014 |
| Hananiah Ltd | Manufacturing | 2017 |
| Hanover Close (Christchurch) Limited | Construction | 2012 |
| Hansam Project Management Limited | Construction | 2007 |
| Hants and Dorset Catering Equipment Services Ltd | Manufacturing | 2015 |
| Happy Lappy Limited | Other services | 2009 |
| Harbour Design Solutions Limited | Professional & scientific | 2019 |
| Harbour EVC Limited | Administrative & support | 2025 |
| Harbour Events Limited | Hospitality | 2025 |
| Harbour Hospitality Group Limited | Financial services | 2017 |
| Harbour Hotels Group Limited | Professional & scientific | 2015 |
| Harbour Hotels Management Limited | Financial services | 2019 |
| Harbour International Limited | Financial services | 2017 |
| Harbour Wolf Ltd | Information & communication | 2021 |
| Harbourlight HR Ltd | Administrative & support | 2025 |
| Harbourside Builders Limited | Construction | 2007 |
| Hardy Homes (Lettings) Ltd | Real estate | 2021 |
| Harewood Gate Limited | Households | 2005 |
| Harrington Court (Highcliffe) Limited | Households | 1986 |
| Harry Hugo Holdings Limited | Financial services | 2026 |
| Hastshilp Ltd | Manufacturing | 2020 |
| Havenwood Academy Limited | Education | 2024 |
| Hayward Rogers Ltd | Construction | 2018 |
| Hazand Limited | Professional & scientific | 2011 |
| Hazell Bespoke Bathrooms Ltd | Construction | 2025 |
| HB Kaizen Management Ltd | Manufacturing | 2016 |
| HBB (South) Limited | Real estate | 2019 |
| HBB Southampton Road Limited | Construction | 2025 |
| HCR Groundworks Ltd | Construction | 2018 |
| HD Doors Limited | Other services | 2023 |
| Healthpa Ltd | Health & social care | 2017 |
| Healthwatch Isle of Wight C.I.C. | Administrative & support | 2013 |
| Healthy by Nature Limited | Wholesale & retail | 2005 |
| Heat Efficient Limited | Construction | 2015 |
| Heat Seeker Solutions Ltd | Construction | 2025 |
| Heathfield Trustees Ltd | | 2023 |
| Heidi Williams Ltd | Professional & scientific | 2012 |
| Helen James Restore & Move Ltd | Health & social care | 2025 |
| Help and Care | Health & social care | 1996 |
| Help ME (New Forest) Limited | Other services | 2017 |
| Helping Hands Office Services Ltd | Administrative & support | 2010 |
| Helping Humans Evolve Limited | Professional & scientific | 2025 |
| Hendrix Construction Ltd | Construction | 2019 |
| Hengistbury Heating and Plumbing Services Ltd | Construction | 2014 |
| Henry Wise Limited | Real estate | 2014 |
| Herbie Starr Limited | Real estate | 2025 |
| Heritage Financial Group Ltd | Financial services | 2023 |
| Heritage Financial Limited | Financial services | 2009 |
| Heritage Sales and Lettings Ltd | Real estate | 2020 |
| Hestia Fire Ltd | Construction | 2020 |
| Hhous Ltd | Professional & scientific | 2023 |
| Hickling Accountancy Ltd | Professional & scientific | 2023 |
| Hickling Retreats Limited | Real estate | 2024 |
| Hicks Network Ltd | Professional & scientific | 2025 |
| High Tech Heating Systems Ltd | Households | 2016 |
| High Voltage Power Systems Limited | Construction | 2021 |
| Highcliffe Food & Arts Festival CIC | Administrative & support | 2019 |
| Highcliffe Heating Services Ltd | Construction | 2020 |
| Highcliffe Residents Association CIC | Professional & scientific | 2007 |
| Highcliffe Sailing Club Limited | Arts & recreation | 2018 |
| Highcliffe Therapies Ltd | Health & social care | 2023 |
| HIGHSPIRITS22 Ltd | Wholesale & retail | 2025 |
| Highwood BIC Limited | Information & communication | 2007 |
| Hill Film Limited | Information & communication | 2018 |
| Hill Post Limited | Manufacturing | 2007 |
| Hillside 41 Ltd | Hospitality | 2023 |
| Hinton Aviation Limited | Professional & scientific | 2019 |
| Hinton Construction Limited | Construction | 2016 |
| Hinton Mill Management Company Limited | Households | 2024 |
| Hinton Solar Generation Limited | Energy | 2012 |
| Hinton Surveyors Limited | Professional & scientific | 2024 |
| Hintonwood Ltd | Information & communication | 2012 |
| Hippo Commercial Ltd | Manufacturing | 2021 |
| Hitec Consulting Services Ltd | Professional & scientific | 2025 |
| Hive Logic Limited | Information & communication | 2017 |
| HM Electricals Ltd | Construction | 2024 |
| Hobbycraft Group Limited | Wholesale & retail | 2010 |
| Hoburne Business Systems Limited | Manufacturing | 1999 |
| Hoburne Development Company Limited | Construction | 1958 |
| Hoburne Electrical Limited | Extraterritorial | 1962 |
| Hoburne Farm Caravan Park Limited | Extraterritorial | 1951 |
| Hoburne Group Limited | Professional & scientific | 2024 |
| Hoburne Leisure Limited | Extraterritorial | 1972 |
| Hoburne Limited | Professional & scientific | 1973 |
| Hoburne Second Homes Limited | Extraterritorial | 1986 |
| Holborn Assets Corporate Services Limited | Administrative & support | 2021 |
| Holbury Developments Ltd | Construction | 2025 |
| Holden Home Buyers Ltd | Real estate | 2020 |
| Holding 4 AMI Limited | Manufacturing | 2022 |
| Holidaze Limited | Administrative & support | 2008 |
| Holly Gardens Limited | Professional & scientific | 1965 |
| Holmsley South Ltd | Agriculture & fishing | 1965 |
| Home Build Group Ltd | Construction | 2019 |
| Home Build Maintenance Ltd | Construction | 2025 |