| GTX Group Limited | Professional & scientific | 2002 |
| Guppy Family Holdings Ltd | Real estate | 2020 |
| GXG Drylining Ltd | Construction | 2019 |
| H&M Capital Ltd | Professional & scientific | 2016 |
| H&S Ride Limited | Transport & logistics | 2023 |
| H&S Safety Services Limited | Construction | 2020 |
| H.D Innovations Limited | Information & communication | 2011 |
| Hairmonious Limited | Other services | 2023 |
| Hall's Private Hire Limited | Transport & logistics | 2016 |
| Hallin Garden Projects Ltd. | Administrative & support | 2023 |
| Hame Solutions Limited | Manufacturing | 2016 |
| Hampshire Blemish Removal Ltd | Other services | 2023 |
| Hampshire Hire Ltd | Administrative & support | 2021 |
| Hampshire Safety Solutions Ltd | Education | 2025 |
| Hampshire School of Aesthetics Ltd | Education | 2025 |
| Hampshire Tile and Stone Limited | Construction | 2022 |
| Hampshire Urology Ltd | Health & social care | 2011 |
| Handy House Solutions Ltd | Other services | 2021 |
| Happy Heights Ltd | Hospitality | 2024 |
| Happy Rides for YOU Limited | Transport & logistics | 2026 |
| Happydog Solutions Ltd | Transport & logistics | 2023 |
| Harbour Creative Ltd | Professional & scientific | 2020 |
| Harbourside Group Limited | Construction | 2008 |
| Harbourside Projects Limited | Construction | 2008 |
| Harbourside Windows and Conservatories Limited | Construction | 2005 |
| Harbourside Yacht Services Ltd | Professional & scientific | 2024 |
| Harehill's Party Paradise Limited | Wholesale & retail | 2024 |
| Harini Nithis Private Limited | Wholesale & retail | 2025 |
| Harris-Liston Properties Ltd | Real estate | 2026 |
| Harrow Chicken Shop Ltd | Hospitality | 2026 |
| Hartville GAS Services Ltd | Energy | 2020 |
| Hashbrowns Solutions Ltd | Information & communication | 2022 |
| Hause of Glamour Hair & Beauty Ltd | Other services | 2023 |
| Havant and East Hants Mind | Health & social care | 2006 |
| Havant and Waterlooville Football Club Limited | Arts & recreation | 1985 |
| Havant Arts Active Limited | Hospitality | 1987 |
| Havant Burger Ltd | Hospitality | 2025 |
| Havant Business Centre (Management) Company Limited | Real estate | 1992 |
| Havant Drive in MOT Services Ltd | Wholesale & retail | 2018 |
| Havant Fish Bar Ltd | Hospitality | 2024 |
| Havant Haulage Co. Limited | | 1973 |
| Havant Homecare Ltd | Health & social care | 2015 |
| Havant Mini Market Ltd | Wholesale & retail | 2025 |
| Havant Passion Play Limited | Education | 2013 |
| Havant Ride Limited | Transport & logistics | 2023 |
| Havant Shop Ltd | Wholesale & retail | 2025 |
| Havant Sweets Ltd | Wholesale & retail | 2011 |
| Havant Takeaway Ltd | Hospitality | 2026 |
| Havant Trading Ltd | Hospitality | 2021 |
| Havant Van and Car Hire Limited | Administrative & support | 2025 |
| Haydan Contstruction Limited | Construction | 2016 |
| Hayfay Limited | Wholesale & retail | 2026 |
| Hayling Chandlery Ltd | Information & communication | 2020 |
| HD Hair Design Ltd | Other services | 2023 |
| HDM Consulting Limited | Professional & scientific | 2005 |
| Hdms (Southern) Ltd | Wholesale & retail | 2021 |
| HDP Propco Ltd | Real estate | 2025 |
| Headromance Ltd. | Other services | 2011 |
| Heatmech Limited | Construction | 2008 |
| Heirlooms Limited | Manufacturing | 1983 |
| Hellawell Family Properties Ltd | Real estate | 2022 |
| Hellawell Properties LLP | | 2017 |
| Helping Hands Allcare Limited | Health & social care | 2002 |
| Helyers Court Limited | Real estate | 2016 |
| Helyers Group (UK) Limited | Professional & scientific | 2013 |
| Helyers Limited | Wholesale & retail | 2011 |
| Henderson Rail Ltd | Professional & scientific | 2026 |
| Hepworth & Crockford Electrical Services Ltd | Construction | 2013 |
| Hero Learning Ltd | Education | 2020 |
| Hestia Web Development Ltd | Information & communication | 2023 |
| Hewitt Matthews Group Ltd | Financial services | 2025 |
| HFA Management Limited | Professional & scientific | 2021 |
| HI Tech Welding Ltd | Manufacturing | 2023 |
| HKA Ceramics Limited | Wholesale & retail | 2021 |
| Holmes Vending Ltd | Wholesale & retail | 2026 |
| Home Energy Assessment and Retrofit Team C.I.C. | Professional & scientific | 2025 |
| Home Property Management Ltd | Households | 2023 |
| Homestudio Limited | Real estate | 2020 |
| Homewell Care Limited | Health & social care | 2000 |
| Homewell Fire Safety UK Ltd | Professional & scientific | 2026 |
| Hookies Scooters Limited | Manufacturing | 2024 |
| Hopkins Carpentry Ltd | Construction | 2025 |
| Hornbeam Tech Services Ltd | Information & communication | 2025 |
| Hoskins Digital Solutions Ltd | Professional & scientific | 2024 |
| Hot WOK Chinese Takeaway Limited | Hospitality | 2022 |
| Hourglass Engraving Limited | Professional & scientific | 1979 |
| Hourglass UK (Havant) Limited | Professional & scientific | 2000 |
| Hourglass UK Limited | Manufacturing | 1984 |
| House Painting & Decorating Limited | Construction | 2026 |
| Howwhatwhere Limited | Wholesale & retail | 2012 |
| HPD Trade Ltd | Construction | 2017 |
| HPK Restaurants Limited | Hospitality | 2021 |
| HRW Consulting Ltd | Professional & scientific | 2019 |
| Human Rights at Sea (Hras) CIC | Information & communication | 2025 |
| Human Rights at Sea International (Hrasi) Ltd | Professional & scientific | 2017 |
| Hungwe Care Limited | Health & social care | 2026 |
| Hvrc Limited | Wholesale & retail | 2006 |
| Hyalucas Limited | Health & social care | 2020 |
| Hybraero Limited | Manufacturing | 2016 |
| Hybrid Plumbing & Build Ltd | Construction | 2025 |