| Hebdons Ltd | Wholesale & retail | 2011 |
| Helen Mcguinness Aesthetics Limited | Other services | 2018 |
| Helen Mcguinness Rejuvenation Day Spa Limited | Other services | 2002 |
| Hellova Tool Company Ltd | Wholesale & retail | 2014 |
| Hemco Power & Control Systems Ltd. | Manufacturing | 1963 |
| Hempstead Lane Management Company Limited | Households | 2010 |
| Henderson Industries Limited | Professional & scientific | 2002 |
| Hendy Automotive Limited | Professional & scientific | 2015 |
| Hendy Group Limited | Wholesale & retail | 1923 |
| Hendy Holdings Limited | Professional & scientific | 1898 |
| Hendy Leisure Limited | Extraterritorial | 1995 |
| Hendy Lennox Commercial Vehicles Limited | Extraterritorial | 1913 |
| Hendy Lennox Trucks Limited | Extraterritorial | 1923 |
| Hendy Lennox Vehicle Contracts Limited | Extraterritorial | 1969 |
| Henry Powell & SON Limited | Other services | 2017 |
| Herbmagic Limited | Health & social care | 2010 |
| Herd Care Limited | Administrative & support | 2017 |
| Herd Recruitment Limited | Administrative & support | 2016 |
| Herd UK Group Limited | Administrative & support | 2018 |
| Heritage Quay Properties Limited | Real estate | 2025 |
| Heritage Roof Repairs Ltd | Construction | 2025 |
| Hermes Asset Protection Limited | Professional & scientific | 2006 |
| Hesd Holdings Ltd | Professional & scientific | 2024 |
| Hesta Property Investment LLP | | 2024 |
| Hestia Construction Limited | Construction | 2014 |
| Hewicks Haulage Limited | Transport & logistics | 2001 |
| HFG Finance Limited | Manufacturing | 2016 |
| HFG Investments Limited | Manufacturing | 2016 |
| HGI (UK) Limited | Financial services | 2003 |
| HGI Property Professionals Limited | Real estate | 2017 |
| HH Entertainment U.K Ltd | Other services | 2018 |
| HHP GP Physio Services Limited | Health & social care | 2025 |
| Hi-Acre Construction Limited | Construction | 2018 |
| Hi-Acre Plant Ltd | Administrative & support | 2026 |
| Hi-Acre Utilities Ltd | Construction | 2025 |
| Hideaway Secure Ltd | Transport & logistics | 2020 |
| High Standard Roofing Ltd | Construction | 2026 |
| High Street Lyndhurst Limited | Other services | 2026 |
| Highbridge Civil Engineering Limited | Construction | 2006 |
| Highbridge Property Investments Limited | Real estate | 2006 |
| Highcliffe Food Safety Consulting Ltd | Hospitality | 2025 |
| Highfield Property Maintenance Ltd | Real estate | 2017 |
| Highgate Property Holdings Limited | Real estate | 2019 |
| Hike IT Trak Racer Limited | Manufacturing | 2023 |
| Hill - Lane Consulting Limited | Information & communication | 2006 |
| Hillcrest Eastleigh Limited | Real estate | 2024 |
| Hills Painting & Decorating Service Limited | Construction | 2019 |
| Hilomast Ltd. | Wholesale & retail | 1958 |
| Hiltingbury Accountancy Services Ltd | Professional & scientific | 1999 |
| Hiltingbury Freeholders Association Ltd | Households | 2006 |
| Hiltingbury Garden Services Limited | Administrative & support | 2019 |
| Hiltingbury Handyman Ltd | Administrative & support | 2013 |
| Hiltingbury Landscapes Ltd | Administrative & support | 2025 |
| Hiltingbury Surgical Services Limited | Health & social care | 2024 |
| Hingstons Antiques Limited | Wholesale & retail | 2006 |
| Hirefix Ltd | Administrative & support | 2023 |
| Hisp Multi Academy Trust Ltd | Education | 2011 |
| Hispec Maintenance Ltd | Households | 2025 |
| Hitan Investments Limited | Real estate | 2024 |
| HJ Reed Investments Limited | Information & communication | 2022 |
| HJF Technical Ltd | Information & communication | 2018 |
| HKF Holdings Limited | Professional & scientific | 2009 |
| HMO Lettings South Ltd | Real estate | 2026 |
| Hmvc Property Limited | Real estate | 2023 |
| HN3FOODS Ltd | Hospitality | 2026 |
| HN3PL Ltd | Transport & logistics | 2020 |
| Hobart Enterprises Limited | Wholesale & retail | 2003 |
| Hoddinott Freehold Management Company Limited | Households | 2022 |
| Hodge Construction Limited | Construction | 1999 |
| Hodgson Acoustics Company Ltd | Manufacturing | 2018 |
| Hogchester Limited | Real estate | 2016 |
| Holbury Consultancy Service Ltd | Professional & scientific | 2014 |
| Hollie Andrews Aesthetics Limited | Health & social care | 2023 |
| Holloway Carpets Ltd | Construction | 2025 |
| Holloway Consulting Limited | Administrative & support | 2023 |
| Holloway Photography Limited | Professional & scientific | 2025 |
| Holman Advisory Ltd | Professional & scientific | 2013 |
| Holmes Southampton Holdings Limited | Construction | 2024 |
| Holmes Southampton Limited | Construction | 2001 |
| Holt Consult Limited | Professional & scientific | 2012 |
| Home Energy Assessors (UK) Limited | Professional & scientific | 2020 |
| Home Lettings & Management Limited | Real estate | 2023 |
| Home Transformers Limited | Construction | 2014 |
| Homeandbeyond Finance Limited | Financial services | 2025 |
| Homebeech Limited | Health & social care | 1998 |
| Homeburgh Ltd | Real estate | 2019 |
| Homedate Property Management Limited | Hospitality | 1994 |
| Homeland SPV Limited | Construction | 2025 |
| Homeleigh Homes Ltd | Households | 2023 |
| Homeleigh Homes Maintenance Ltd | Construction | 2023 |
| Homeleigh Lettings LLP | | 2023 |
| Homemade Care Services Limited | Health & social care | 2024 |
| Homes for Eastleigh LLP | | 2021 |
| Homes From Home Properties Limited | Real estate | 2025 |
| Homeshield Cover Ltd | Manufacturing | 2021 |
| Honey Comb Studio Limited | Other services | 2021 |
| Honora Holdings Limited | Real estate | 2025 |
| Hoover Circular Solutions Holdings Limited | Manufacturing | 2016 |
| Hoover Circular Solutions Limited | Manufacturing | 2016 |
| Hopper Williams & Bell Limited | Professional & scientific | 2003 |