| Havelock Mansions RTM Company Limited | Hospitality | 2012 |
| Havencroft Residents Association Limited | Households | 1983 |
| Havesters Care Ltd | Health & social care | 2018 |
| Havesters Homes Ltd | Real estate | 2024 |
| Hawk House (Ryde) Limited | Households | 2018 |
| Hawk Maintenance Limited | Construction | 2025 |
| Hawkins Electrical (Southern) Ltd | Construction | 2017 |
| Hawthorn Freight Management Ltd | Transport & logistics | 2024 |
| HAY Interior Systems Ltd | Construction | 2014 |
| Hayalsu Ltd | Hospitality | 2026 |
| Hayden White Commercial Ltd | Real estate | 2021 |
| Hayden White Holding Ltd | Real estate | 2021 |
| Hayes Holdings Group Ltd | Energy | 2026 |
| Hayes Multi Traders Ltd | Construction | 2026 |
| Hayley's House Ltd | Health & social care | 2024 |
| Hayling Guru Ltd | Professional & scientific | 2025 |
| Hayling Holidays Limited | Real estate | 1987 |
| Hayling Island & Emsworth PCN Limited | Health & social care | 2022 |
| Hayling Island Scallops Ltd | Agriculture & fishing | 2023 |
| Hayling Landscapes Ltd | Administrative & support | 2002 |
| Hayling Postal Services Limited | Transport & logistics | 2021 |
| Hayling Truck Centre Limited | Wholesale & retail | 2010 |
| Hazel & Sons Ltd | Administrative & support | 2025 |
| HB Cable Jointing Ltd | Construction | 2025 |
| HB Cleaning Limited | Administrative & support | 2002 |
| HB Commercial Property Investments Limited | Real estate | 2020 |
| HB Hydraulics Limited | Manufacturing | 2019 |
| HB Property Assets Ltd | Real estate | 2021 |
| Hbbc Limited | Construction | 2019 |
| Hbtmen Ltd | Hospitality | 2022 |
| Hcdp Holdings Limited | Financial services | 2023 |
| HCM Interiors Limited | Construction | 2021 |
| HCO Store Ltd | Wholesale & retail | 2023 |
| HCR Fire Stopping Ltd | Construction | 2023 |
| HD Carpentry Services Ltd | Construction | 2025 |
| HDB Consultants Ltd | Professional & scientific | 2024 |
| Hdkn Ltd | Health & social care | 2010 |
| Hdkn Property Limited | Real estate | 2025 |
| Headland Homes Limited | Real estate | 2019 |
| Headway Portsmouth & South-East Hampshire | Health & social care | 2001 |
| Healing Hands in the Community CIC | Extraterritorial | 2024 |
| Health House Dental Practice LLP | | 2009 |
| Health Sleep Limited | Wholesale & retail | 2025 |
| Healthcare Efficiency Limited | Health & social care | 2014 |
| Healthcare Expert Consulting Limited | Health & social care | 2014 |
| Healthhub Southsea CIC | Other services | 2015 |
| Heart and Soul Accounting Limited | Professional & scientific | 2024 |
| Heathrow Logistics Limited | Transport & logistics | 2018 |
| Heating and Renewable Technologies Limited | Extraterritorial | 2024 |
| Heating Pumping and Air Conditioning Limited | Construction | 2025 |
| Heattech M&H Ltd | Construction | 2025 |
| Heattech Mechanical & Heating Limited | Construction | 2019 |
| Hectic (Europe) Ltd | Wholesale & retail | 2016 |
| Hectic 2024 Limited | Wholesale & retail | 2021 |
| Hectic Limited | Wholesale & retail | 2019 |
| Hectic Logistics Limited | Professional & scientific | 2021 |
| Hectic Numbers Limited | Professional & scientific | 2019 |
| Hectic People Limited | Administrative & support | 2021 |
| Hectic Ventures Limited | Financial services | 2024 |
| Hecticagents Ltd | Wholesale & retail | 2019 |
| Heddon Commercial Limited | Transport & logistics | 2024 |
| Heddon Group Limited | Financial services | 2024 |
| Heddon Investments Limited | Real estate | 2017 |
| Heer Tech Limited | Information & communication | 2017 |
| Hegan Homes Limited | Real estate | 2019 |
| Heimdal Wealth Limited | Real estate | 2023 |
| Heirs of Portsmouth Limited | Transport & logistics | 2019 |
| Heliumlab Limited | Wholesale & retail | 2021 |
| Hellfever Ltd | Information & communication | 2015 |
| Hellier Langston Limited | Real estate | 2004 |
| Hellier Langston Property Limited | Real estate | 2013 |
| Help 4 Special Children | Other services | 2010 |
| Hemley International Ltd | Transport & logistics | 2008 |
| Henaka Limited | Real estate | 2017 |
| Henderson Holdings Southern UK Limited | Real estate | 2026 |
| Henning Holdings Ltd | Construction | 2020 |
| Henry Thomas Equity Management Ltd | Financial services | 2021 |
| Henry Thomas Global Partners Limited | Professional & scientific | 2016 |
| Henry Thomas Homes (Hempstead) Limited | Construction | 2023 |
| Henry Thomas Homes (Student) Limited | Financial services | 2023 |
| Henry Thomas Homes (Ventnor) Limited | Construction | 2023 |
| Henry Thomas Homes (Westcott) Limited | Construction | 2024 |
| Henry Thomas Homes (Weymouth) Limited | Construction | 2023 |
| Henry Thomas Homes Limited | Construction | 2023 |
| Henry Thomas Technical Ltd | Professional & scientific | 2020 |
| Hepman Limited | Manufacturing | 2020 |
| Hereford Glass Fibre Composites Limited | Manufacturing | 2026 |
| Hereford Lodge Freehold Limited | Households | 2019 |
| Hereworx (Southsea) Ltd | Real estate | 2024 |
| Heritage Creations Ltd | Construction | 2016 |
| Heritage Property Options Limited | Real estate | 2019 |
| Herman Limited | Health & social care | 2019 |
| Hermitage Woodlands Limited | Agriculture & fishing | 2023 |
| Herne Hill Developments Ltd | Construction | 2025 |
| Herne Industrial Coatings Limited | Construction | 2017 |
| Heron House (Southsea) Management Company Limited | Households | 2002 |
| Heron's Quarter Management Company Limited | Households | 2023 |
| Herons Autos Limited | Wholesale & retail | 2019 |
| Hertfordshire House Shares Limited | Real estate | 2019 |
| Hesh Consultancy Ltd | Information & communication | 2026 |