| Hambledon Developments Ltd | Construction | 2020 |
| Hamilton 44 Limited | Real estate | 2016 |
| Hamilton Court House Limited | Real estate | 2013 |
| Hamilton Freehold Limited | Households | 2013 |
| Hamilton Mews Management Limited | Households | 2003 |
| Hamlen Court (Bournemouth) Limited | Households | 1995 |
| Hamlett Property Limited | Real estate | 2025 |
| Hamond Wholesale and Distribution Limited | Wholesale & retail | 2023 |
| Hampshire & Dorset DPC Ltd | Construction | 2017 |
| Hampshire Civils Limited | Construction | 2024 |
| Hampshire Dental Therapists Limited | Other services | 2021 |
| Hampshire Gallery Limited | Administrative & support | 2001 |
| Hampshire House Limited | Households | 2005 |
| Hampshire Properties Limited | Real estate | 2002 |
| Hampshire Trade Supplies Ltd | Education | 2019 |
| Hampstead Manor LP | | 2018 |
| Hampton Court Limited | Households | 1995 |
| Hamptons Property Developments Limited | Construction | 2017 |
| Hamptonsmith PTY Ltd | Health & social care | 2018 |
| HAN & Saints Ltd | Wholesale & retail | 2020 |
| Hanah Homes Ltd | Construction | 2017 |
| Hancock.Tomlin Limited | Arts & recreation | 2003 |
| Handle IT AI Ltd | Information & communication | 2025 |
| Handsome Hounds Limited | Other services | 2002 |
| Handston Investments Limited | Real estate | 1983 |
| Handy Lads Ltd | Other services | 2018 |
| Hangov Group Ltd | Manufacturing | 2025 |
| Hanigo Ltd | Transport & logistics | 2021 |
| Hanlon Kneller and Associates LLP | | 2006 |
| Hann & Company Limited | Administrative & support | 1992 |
| Hanna Catering Limited | Hospitality | 2024 |
| Hanna Maintenance Ltd | Construction | 2026 |
| Hannam Estates Limited | Construction | 2016 |
| Hans Shake Ltd | Hospitality | 2025 |
| Hansford Consultancy Ltd | Information & communication | 2022 |
| Hansson Health Ltd | Health & social care | 2009 |
| Hants & Dorset Gardening Services Limited | Administrative & support | 2013 |
| Hapollo Limited | Administrative & support | 2012 |
| Happy Bunny Hotels Ltd | Hospitality | 2011 |
| Happy Homewares Limited | Wholesale & retail | 2018 |
| Happy Hormones Shop Ltd | Wholesale & retail | 2020 |
| Happy Pizza Studio Ltd | Professional & scientific | 2024 |
| Happyeater Ltd | Hospitality | 2019 |
| HAQ Private Ltd | Wholesale & retail | 2024 |
| Harber Stone Limited | Extraterritorial | 1987 |
| Harbour Court (Barton-On-Sea) Limited | Households | 1960 |
| Harbour Court (Poole) Management Company Limited | Households | 1981 |
| Harbour Court Freehold Limited | Households | 2022 |
| Harbour GAS Limited | Construction | 2010 |
| Harbour Hair Design Ltd | Other services | 2019 |
| Harbour Heating Limited | Construction | 2012 |
| Harbour Heights (Sandbanks) Limited | Hospitality | 2024 |
| Harbour Lights Electrical Limited | Construction | 2021 |
| Harbour Park Management Company Limited | Households | 2009 |
| Harbour Paving Limited | Construction | 2023 |
| Harbour Prospect Management Company Limited | Households | 1969 |
| Harbour Reach Management Limited | Households | 2012 |
| Harbour View Freehold Limited | Households | 2012 |
| Harbour View Management Limited | Households | 1995 |
| Harbour View Southbourne Ltd | Households | 2021 |
| Harbourside Digital Ltd | Information & communication | 2024 |
| Harbourside Electrical Limited | Construction | 2012 |
| Harcourt Freehold Limited | Real estate | 2001 |
| Harcourt Temple Limited | Other services | 1970 |
| Hard Graphed Ltd | Information & communication | 2025 |
| Hardacre Construction Services Limited | Construction | 2010 |
| Hardings Property Management Ltd | Real estate | 2021 |
| Hardpoint Security Limited | Administrative & support | 2025 |
| Hardy 1962 Ltd | Extraterritorial | 2016 |
| Hardy Pumps UK Ltd | Manufacturing | 2025 |
| Hardy Solutions Ltd | Wholesale & retail | 2026 |
| Hardys Business Services Ltd | Construction | 2017 |
| Hardy’S Holdings Limited | Financial services | 2025 |
| Harewood Court Management Company Limited | Households | 2009 |
| Harewood Property Ltd | Real estate | 2021 |
| Haris & Co Real Estate Ltd | Real estate | 2019 |
| Harley Franks Ltd | Information & communication | 2023 |
| Harley's Angels Cleaning Services Ltd | Administrative & support | 2018 |
| Harman Martin Limited | Professional & scientific | 2025 |
| Harmans Cross Management Limited | Households | 2018 |
| Harmon Manufacturing Limited | Professional & scientific | 2015 |
| Harmonious Futures Limited | Information & communication | 2013 |
| Harmonise Solutions Limited | Information & communication | 2020 |
| Harmonising Property Investments Ltd | Real estate | 2019 |
| Harmonising Property Limited | Real estate | 2019 |
| Harmonising Property Solutions Ltd | Information & communication | 2018 |
| Harmony UK Homes Ltd | Construction | 2019 |
| Harnden Holdings Ltd | Financial services | 2024 |
| Harnden Homes Ltd | Construction | 2015 |
| Haroys Limited | Manufacturing | 2004 |
| Harpers Hygiene Services Limited | Health & social care | 2009 |
| Harrietsham House RTM Company Limited | Households | 2019 |
| Harrington & Johnston Limited | Hospitality | 2025 |
| Harrington Investments (Southern) Limited | Real estate | 2011 |
| Harrington Tencreek Ltd | Construction | 2019 |
| Harriplan (South West) Ltd | Professional & scientific | 2008 |
| Harriplan Holdings Limited | Real estate | 2004 |
| Harris & Hedges Ltd | Information & communication | 2025 |
| Harrison Housing Developments Limited | Construction | 2020 |
| Harrison Housing Lettings Limited | Real estate | 2020 |