| Gulli Limited | Hospitality | 2026 |
| Gully Howard Technical Limited | Professional & scientific | 2004 |
| Gunboat Yard Limited | Real estate | 2024 |
| Gunnersbury Limited | Other services | 2021 |
| Gunver Ltd | Construction | 2023 |
| Gunwharf Quays Residents Company Limited | Households | 1999 |
| Guru Fusion Express Ltd | Hospitality | 2021 |
| Guru Spice Fusion Ltd | Hospitality | 2019 |
| Gustino Ltd | Hospitality | 2026 |
| GUY Rutherford Management Limited | Administrative & support | 2004 |
| Guyanese Health Care Professionals Limited | Health & social care | 2020 |
| Guymers Ltd | Energy | 2025 |
| GV Express Ltd | Transport & logistics | 2022 |
| GVB Portsmouth Ltd | Hospitality | 2025 |
| GVR IT Services Ltd | Information & communication | 2022 |
| GW Apartments Ltd | Hospitality | 2018 |
| Gwalia Flats (Southsea) Limited | Households | 2003 |
| GY1 Limited | Construction | 2017 |
| Gym Athlete Ltd | Wholesale & retail | 2020 |
| Gymbuddy Health & Fitness Ltd | Information & communication | 2017 |
| Gymstays Ltd | Hospitality | 2024 |
| H & S Capital Limited | Real estate | 2022 |
| H & S Groundworks Ltd | Construction | 2023 |
| H B Plumbing & Heating (South) Ltd | Construction | 2007 |
| H Boogie Music Ltd | Information & communication | 2020 |
| H Fisher Holdings Limited | Financial services | 2018 |
| H&C Scaffolding Ltd | Construction | 2024 |
| H&G Hamilton Ltd | Hospitality | 2026 |
| H&H Holdings (Lymington) Limited | Administrative & support | 2022 |
| H&L Scaffolding South Limited | Construction | 2026 |
| H&R Brands Limited | Wholesale & retail | 2025 |
| H&R Groundwork's & Labour Solutions Limited | Construction | 2026 |
| H. Monfared (Builders) Limited | Construction | 2004 |
| H. Monfared Management Limited | Real estate | 2026 |
| H. Monfared Real Estates Limited | Real estate | 2023 |
| H.C.B. Bar One Ltd | Hospitality | 2020 |
| H.J. Haynes Limited | | 1946 |
| H2 Assets Ltd | Real estate | 2018 |
| H20 Facilities Services Limited | Real estate | 2025 |
| H2O Accounting Limited | Professional & scientific | 2009 |
| Habesha House Restaurant Ltd | Hospitality | 2022 |
| Habiti Group Ltd | Real estate | 2025 |
| Habiti Investments Ltd | Professional & scientific | 2025 |
| Habiti Lettings Ltd | Real estate | 2026 |
| Habiti Property Ltd | Real estate | 2025 |
| Hackney Lease Limited | Transport & logistics | 2012 |
| Haddigan Homes Limited | Real estate | 2024 |
| Haddrells Rentals Ltd | Real estate | 2024 |
| Haha Academy Ltd | Other services | 2024 |
| Haha Training Ltd | Information & communication | 2012 |
| Hail & Stone Construction Limited | Construction | 2026 |
| Hail & Stone Properties Limited | Real estate | 2025 |
| Hailstones Associates Limited | Professional & scientific | 2024 |
| Haitch Heating Ltd | Construction | 2021 |
| Halal Venison UK Ltd | Wholesale & retail | 2024 |
| Halcyon Events Limited | Construction | 2017 |
| Hale Healthcare Services Limited | Health & social care | 2016 |
| Hale Homes Roofing Specialist Ltd | Other services | 2017 |
| Halford Psychotherapy Ltd | Health & social care | 2024 |
| Haller Holdings Limited | Real estate | 2020 |
| Halliday Property Ltd | Construction | 2011 |
| Hallies Construction Ltd | Construction | 2017 |
| Hallsun Limited | Construction | 2016 |
| Halo Creative Hair Ltd | Other services | 2010 |
| Hambledon Heart Clinic Ltd | Health & social care | 2013 |
| Hamblett Homes (Manchester) Limited | Real estate | 2016 |
| Hamblett Homes Limited | Real estate | 2014 |
| Hambrook Car Sales Ltd | Wholesale & retail | 2026 |
| Hambrook Cars Limited | Wholesale & retail | 2016 |
| Hambrook Street Limited | Households | 2023 |
| Hamilton Knight Limited | Real estate | 2004 |
| Hamilton North Limited | Hospitality | 2020 |
| Hampshier Limited | Wholesale & retail | 2026 |
| Hampshire & Sussex Contract Cleaning Ltd | Administrative & support | 2012 |
| Hampshire (R & D) Glassware Limited | Manufacturing | 1968 |
| Hampshire Access Floors Limited | Construction | 2013 |
| Hampshire and the Isle of Wight Community Foundation | Professional & scientific | 2002 |
| Hampshire Boulevard Limited | Hospitality | 2002 |
| Hampshire Boutique Hotels Limited | Hospitality | 2011 |
| Hampshire Brickwork Solutions Limited | Construction | 2021 |
| Hampshire Building & Maintenance Services Limited | Construction | 2023 |
| Hampshire Building Preservation Ltd | Construction | 2005 |
| Hampshire Building Projects (Southern) Limited | Construction | 2022 |
| Hampshire Building Services Limited | Construction | 2022 |
| Hampshire Cardiologist Ltd | Health & social care | 2019 |
| Hampshire Commercial Refurbishment Ltd | Construction | 2014 |
| Hampshire Construction (South) Ltd | Construction | 2024 |
| Hampshire Damp and Mould Solutions Ltd | Construction | 2025 |
| Hampshire Decor Ltd | Construction | 2015 |
| Hampshire Decorating Solutions Ltd | Construction | 2022 |
| Hampshire Dermatology Partnership Limited | Health & social care | 2024 |
| Hampshire Developments and Land Limited | Construction | 2021 |
| Hampshire Developments Limited | Construction | 1997 |
| Hampshire Drives Ltd | Construction | 2019 |
| Hampshire Drywall Ltd | Extraterritorial | 2023 |
| Hampshire Glazing Solutions Ltd | Construction | 2025 |
| Hampshire Groundworks & Surfacing Limited | Construction | 2016 |
| Hampshire Hair & Beauty Limited | Other services | 2019 |
| Hampshire Health and Care Ltd | Health & social care | 2025 |
| Hampshire Heart Clinic Ltd | Health & social care | 2011 |