| Heung Gong YAN Ltd | Hospitality | 2022 |
| Hexagon Property Services Limited | Construction | 2017 |
| Hexton Eyewear Ltd | Wholesale & retail | 2021 |
| HEY SUB Ltd | Hospitality | 2023 |
| Heyes-Lehman Asset Management Limited | Information & communication | 2011 |
| Hg-Olf Holdings Limited | Financial services | 2026 |
| HGW Hubs Limited | Real estate | 2022 |
| HH Necessities Ltd | Wholesale & retail | 2025 |
| HI Developments South Limited | Construction | 2019 |
| HI Hairdresser Ltd | Other services | 2021 |
| Hi-Ram Bar & Co Limited | Wholesale & retail | 2025 |
| Hi-Tech Cleaning Services South Limited | Administrative & support | 2026 |
| Hibba Abaya Ltd | Wholesale & retail | 2026 |
| Hickman Resurfacing Limited | Construction | 2015 |
| Hidden Learning Limited | Education | 2017 |
| Hideaway Medical Services Ltd | Administrative & support | 2012 |
| Hideout Coffee Co Limited | Wholesale & retail | 2018 |
| Higby Developments Limited | Real estate | 2017 |
| High Quality Ltd | Health & social care | 2018 |
| High Stack Limited | Real estate | 2015 |
| High Street Services Limited | Real estate | 1986 |
| High Walkers Ltd | Professional & scientific | 2012 |
| Higham Window Company Limited | Construction | 2004 |
| Highbury Fryers Ltd | Hospitality | 2025 |
| Higherplane Aviation Training Limited | Professional & scientific | 2001 |
| Highgrove Homes Limited | Financial services | 2016 |
| Highland ROW Ltd | Construction | 2021 |
| Hilary Web Solutions Ltd | Information & communication | 2022 |
| Hilbornes Sweets Ltd | Wholesale & retail | 2025 |
| Hilco Real Estate Finance UK Ltd | Financial services | 2023 |
| Hill Holdings Southern Ltd | Financial services | 2026 |
| Hilldale Paddocks Limited | Real estate | 2025 |
| Hillside Property Maintenance Limited | Administrative & support | 2002 |
| Hilltechnology Limited | Professional & scientific | 2023 |
| Hilsea (Parsons Close) Residents Company Limited | Households | 2002 |
| Hilsea Fish Bar Ltd | Hospitality | 2022 |
| Hilsea Group Ltd | Wholesale & retail | 2024 |
| Hilsea Harness & Saddlery Ltd | Water & waste | 2020 |
| Hilsea Mot.Com Limited | Wholesale & retail | 2013 |
| Hilsea Steel Fabrications Limited | Manufacturing | 2025 |
| Hilton Construction Services Ltd | Construction | 2017 |
| Hilton Homes Property Limited | Households | 2023 |
| Hilton Park Management Company Limited | Households | 2012 |
| Hinks Associates Ltd | Professional & scientific | 2025 |
| Hinton Property Investments Limited | Real estate | 2004 |
| Hippopad Ltd | Real estate | 2015 |
| Hippos Network Limited | Information & communication | 2006 |
| Hipsurgery Limited | Health & social care | 2024 |
| Hire Hive Ltd | Administrative & support | 2026 |
| Hirevo UK Ltd | Administrative & support | 2026 |
| Hiry Ltd | Administrative & support | 2024 |
| Historical Walking Tours Limited | Administrative & support | 2023 |
| Histto Limited | Wholesale & retail | 2023 |
| Hive Client Services Limited | Professional & scientific | 2015 |
| Hive Company Secretarial Services Limited | Professional & scientific | 2018 |
| Hive IT Support & Services Limited | Information & communication | 2023 |
| HJ Holdings Group Limited | Other services | 2024 |
| Hjja Investments Limited | Professional & scientific | 2024 |
| HK Good Brothers Ltd | Hospitality | 2022 |
| HK Holdings South Limited | Financial services | 2026 |
| HK Subway Ltd | Hospitality | 2010 |
| HK3 Limited | Public administration | 2018 |
| Hkph Limited | Hospitality | 2025 |
| HM Health and Beauty Limited | Other services | 2016 |
| HMH Healthcare Limited | Health & social care | 2023 |
| HMO Ltd | Real estate | 2026 |
| HMO South Ltd | Construction | 2024 |
| Hmochecker Limited | Information & communication | 2024 |
| HMS Maintenance Limited | Construction | 2026 |
| Ho'Oponopono Ltd | Real estate | 2021 |
| Hodge Plumbing & Heating Limited | Construction | 2014 |
| Hoggies 2 Go Ltd | Hospitality | 2023 |
| Holbrook & SON Limited | Professional & scientific | 1894 |
| Holden Mews Management Company Limited | Households | 2018 |
| Holder Investments Ltd | Real estate | 2020 |
| Holding the Keppel's Head Limited | Hospitality | 2019 |
| Holding the Lady Limited | Real estate | 2015 |
| Hollam Leasing Ltd | Professional & scientific | 2007 |
| Holland Accountancy Limited | Professional & scientific | 2010 |
| Hollen Health Ltd | Health & social care | 2025 |
| Hollie R Enterprises Ltd | Construction | 2020 |
| Holloway Iliffe & Mitchell Limited | Administrative & support | 2003 |
| Holly Court Residents Co Ltd | Households | 1988 |
| Holmes Industrial Services Limited | Construction | 1998 |
| Holmes PUB Company Limited | Hospitality | 2019 |
| Holtray Projects Ltd | Construction | 2022 |
| Home & Commercial Mortgages Limited | Professional & scientific | 2002 |
| Home Bright Bespoke Ltd | Construction | 2019 |
| Home Bright Constructions Limited | Real estate | 2021 |
| Home Comfort 786 Ltd | Real estate | 2026 |
| Home Improvement Network Ltd | Construction | 2022 |
| Home PC Advisor Limited | Information & communication | 2008 |
| Home Preservation Limited | Construction | 2021 |
| Home Safe Products Ltd | Manufacturing | 2014 |
| Home Solutions (Portsmouth) Limited | Real estate | 2011 |
| Home to Home Carpets Limited | Wholesale & retail | 2019 |
| Home YOU Love Ltd | Real estate | 2020 |
| Home-Start Portsmouth | Other services | 2008 |
| HOMEHAVEN786 Ltd | Real estate | 2025 |
| HOMEHAVEN786PROPERTIES Ltd | Real estate | 2026 |