| Health Equity Consulting Limited | Professional & scientific | 2016 |
| Health Policy Labs Limited | Professional & scientific | 2026 |
| Health-E-Futures Limited | Professional & scientific | 2011 |
| Healthways Products Limited | Health & social care | 1985 |
| Healthy in Business Limited | Information & communication | 2020 |
| Healthy Poppets Ltd | Hospitality | 2024 |
| Heart Biotech Holdings Limited | Professional & scientific | 2014 |
| Heart Biotech Limited | Health & social care | 2013 |
| Heart Biotech Nano Limited | Professional & scientific | 2014 |
| Heartwood Veterinary Services Ltd | Professional & scientific | 2025 |
| Heather Mckaig Ltd | Hospitality | 2012 |
| Heatsource Boilers Ltd | Construction | 2003 |
| Hegan Developments Limited | Real estate | 2013 |
| Heinz Baines Limited | Information & communication | 2025 |
| Helen Dawson & Associates Ltd | Professional & scientific | 2021 |
| Helen Tweedy Ltd | Administrative & support | 2014 |
| Helena Bissett Marketing Ltd | Professional & scientific | 2010 |
| Heli-Matters Limited | Professional & scientific | 2019 |
| Helical Productions Ltd. | Information & communication | 2015 |
| Helping Hooves UK Ltd | Health & social care | 2015 |
| Hematite Ltd | Professional & scientific | 2013 |
| Hemp Pharm Ltd | Wholesale & retail | 2021 |
| Hendo and Co Ltd | Construction | 2017 |
| Heneghan Project Management Limited | Information & communication | 2018 |
| Henley Propco Limited | Financial services | 2021 |
| Henley Risk Consultants Limited | Professional & scientific | 2016 |
| Henry Blake Properties Limited | Real estate | 2026 |
| Henry's Car Barn Hampshire Ltd | Transport & logistics | 2024 |
| Henstead Road (Southampton) Management Company Limited | Real estate | 2000 |
| Hera Business Services Limited | Administrative & support | 2002 |
| Herbert Morrison Holdings Ltd | Real estate | 2026 |
| Heritage Legacy Group Ltd | Construction | 2025 |
| Heritage Place Management Company Limited | Households | 2006 |
| Hermitage Organic LLP | | 2018 |
| Heron's RYE Management Limited | Households | 1973 |
| Herondean (Chichester) Management Company Limited | Households | 1989 |
| Herriard Developments Limited | Real estate | 1986 |
| Herries Farm LLP | | 2020 |
| Hexnex Jewellery Limited | Manufacturing | 2018 |
| Heybear Consulting Limited | Professional & scientific | 2016 |
| Heytesbury MOT & Service Centre Limited | Wholesale & retail | 2003 |
| HGM GB Holdings Limited | Financial services | 2023 |
| HGP Properties Limited | Real estate | 2019 |
| HGV Driver Recruitment UK Ltd | Administrative & support | 2019 |
| HH Land Profits Ltd | Real estate | 2024 |
| Hickling SAM Ltd | Professional & scientific | 2022 |
| Hickson & Hickson Limited | Education | 2011 |
| Hickson & Hickson Property Limited | Real estate | 2016 |
| Hickson Partners Limited | Administrative & support | 2020 |
| Hidden Beneath International Ltd | Wholesale & retail | 2025 |
| Hidden GEM Private Dining Limited | Hospitality | 2024 |
| Hidden GEM Restaurant Limited | Hospitality | 2021 |
| Higgle Ltd | Education | 2021 |
| High Dell Sporting Ltd | Agriculture & fishing | 2017 |
| High Garth Management Company Limited | Households | 1981 |
| High Velocity Limited | Professional & scientific | 2024 |
| Higher Fidelity Limited | Wholesale & retail | 2023 |
| Highgrade DS Ltd | Construction | 2012 |
| Highstone Consulting Limited | Information & communication | 2017 |
| Hilcon Limited | Construction | 2016 |
| Hilda Court RTM Company Limited | Households | 2023 |
| Hill Court Real Estate Limited | Real estate | 2022 |
| Hill Heating Limited | Construction | 2018 |
| Hilltop (Winchester) Management Company Limited | Administrative & support | 2013 |
| Hilts Limited | Professional & scientific | 2015 |
| Himalaya Catering Ltd | Hospitality | 2025 |
| Hire Charge Limited | Energy | 2012 |
| HIT Home Limited | Other services | 2018 |
| Hixon Family Funerals Limited | Financial services | 2025 |
| HJB Projects Ltd | Information & communication | 2021 |
| HK Agri Limited | Agriculture & fishing | 2025 |
| HLG Consulting Ltd | Professional & scientific | 2024 |
| HMC1 Limited | Construction | 2022 |
| Hobbers Inc. Limited | Professional & scientific | 2021 |
| Hobbs IT Services Ltd | Information & communication | 2017 |
| Hobbs Rehabilitation Limited | Professional & scientific | 2005 |
| Hockley Golf Club Limited | Arts & recreation | 2014 |
| Hockley Paddock Limited | Real estate | 2025 |
| Hogget and Boar Ltd | Wholesale & retail | 2019 |
| Hogleaze Storage Limited | Real estate | 2011 |
| Holbrook Independent Traders Limited | Professional & scientific | 2022 |
| Hold Ltd | Information & communication | 2019 |
| Holdenby Estates Limited | | 1972 |
| Holder and Ferry Limited | Other services | 2015 |
| Holder Holistics Ltd | Other services | 2025 |
| Holder That Thought Ltd | Professional & scientific | 2025 |
| Holiday Service Ltd | Real estate | 2018 |
| Hollnat Ltd | Construction | 2018 |
| Hollographics Ltd | Manufacturing | 2003 |
| Holm Oak Close Management Company Limited | Households | 2009 |
| Holm Products Limited | Construction | 2019 |
| Holmdene Investments Limited | Real estate | 1961 |
| Holmes Field Court Management Company Limited | Households | 2015 |
| Holocene Public Relations Ltd | Professional & scientific | 2024 |
| Holton Paddocks Limited | Agriculture & fishing | 1958 |
| Homarus Limited | Professional & scientific | 2001 |
| Home School Tutoring Hampshire West & Central Ltd | Education | 2026 |
| Home-School Tutoring UK Limited | Education | 2015 |
| Home-Start Winchester and Districts | Health & social care | 2005 |
| Homefeast Ltd | Hospitality | 2020 |