| Hair Salon Supreme Limited | Other services | 2024 |
| Hairy Hand Productions Ltd | Information & communication | 2025 |
| Halcyon Risk Management Ltd | Financial services | 2018 |
| Halcyon TCB Limited | Professional & scientific | 2017 |
| Haldex Services Ltd | Information & communication | 2025 |
| Hale Engineering and Services Limited | Professional & scientific | 2024 |
| Hale Oaks Farm Holdings Limited | Households | 2024 |
| Hall & Middleton Limited | Professional & scientific | 2016 |
| Hallett Homes Ltd | Real estate | 2024 |
| Hallfell Ltd | Households | 2015 |
| Hallon AI Ltd | Professional & scientific | 2026 |
| Halo Associates LLP | | 2018 |
| Halo Corporate Finance Limited | Administrative & support | 2005 |
| Halo Interiors Limited | Construction | 2018 |
| Hamann Group Ltd | Transport & logistics | 2015 |
| Hamblet Limited | Hospitality | 2024 |
| Hamilton Flooring Agency Ltd | Wholesale & retail | 2025 |
| Hammer Valley Farm Limited | Agriculture & fishing | 2011 |
| Hammerpond Kennels Limited | Agriculture & fishing | 2007 |
| Hammerpond Road (Horsham) Management Company Limited | Households | 2013 |
| Hampers Landscape Contractors Ltd | Administrative & support | 2026 |
| Hampshire Freeholds Limited | Real estate | 2020 |
| Hampshire Rare Breeds Limited | Agriculture & fishing | 2022 |
| Hanbel Care Limited | Health & social care | 2016 |
| Hanbell Care Limited | Health & social care | 2024 |
| Hanbury Williams Private Wealth Ltd | Financial services | 2026 |
| Hand Built Limited | Real estate | 2005 |
| Handyman and More Ltd. | Construction | 2014 |
| Hanlen Group Ltd | Financial services | 2018 |
| Hansen and MAC Ltd | Transport & logistics | 2019 |
| Hansenmac Holdings Ltd | Transport & logistics | 2020 |
| Happy Accidents CIC | Administrative & support | 2018 |
| Happy Developments South LLP | | 2006 |
| Happy Parcel Couriers Ltd | Transport & logistics | 2021 |
| Happy WOK Sticks Ltd | Hospitality | 2024 |
| Happyissue Limited | Arts & recreation | 1992 |
| Happyscamps Ltd | Arts & recreation | 2014 |
| Hapstead Properties Limited | Real estate | 2006 |
| HAQ Cars Limited | Transport & logistics | 2017 |
| Hardings Estate Agency Limited | Real estate | 1991 |
| Hardmann Brewing Company Ltd | Manufacturing | 2025 |
| Hardy Brickwork & Construction Limited | Construction | 2019 |
| Harley Accountancy Services Limited | Professional & scientific | 2002 |
| Haroco Property Management Limited | Real estate | 2024 |
| Harrington Mews (Farthings Hill) Management Company Limited | Households | 2013 |
| Harris Wickens Ltd | Real estate | 2023 |
| Harrison Rural Partners Limited | Real estate | 2012 |
| Hart Square Consulting Limited | Information & communication | 2023 |
| Hartmann Construction Ltd | Construction | 2016 |
| Haru Construction Ltd | Construction | 2023 |
| Harz UK Limited | Hospitality | 2015 |
| Hasan Consultancy Limited | Professional & scientific | 2024 |
| Hasz Recruitment Solutions Ltd | Transport & logistics | 2019 |
| Hatchman Services Ltd | Construction | 2016 |
| Haus Horsham Ltd | Other services | 2025 |
| Haven Distribution Limited | Wholesale & retail | 2012 |
| Haven Fayre Ltd | Agriculture & fishing | 2026 |
| Havlitten Limited | Construction | 2004 |
| Hawkesbourne Park Farm LLP | | 2023 |
| Hawkins Farm and Plant Ltd | Agriculture & fishing | 2019 |
| Hawkins Plumbing and Heating Limited | Construction | 2022 |
| Hawth Gymnastics Limited | Arts & recreation | 2005 |
| Hayes Grange Farm Ltd | Agriculture & fishing | 2020 |
| Hayley Georgiou Property Limited | Real estate | 2022 |
| Hayley Rich Ltd | Other services | 2015 |
| Hazelhurst Crescent 1964 Limited | Extraterritorial | 2014 |
| Hazlehurst Property Solutions Ltd | Real estate | 2026 |
| Hazopol Limited | Real estate | 2024 |
| HB Design Studio Ltd | Professional & scientific | 2020 |
| HB Lending Limited | Financial services | 2021 |
| HBM Electrical Ltd | Professional & scientific | 2025 |
| HCS Estate Services Limited | Professional & scientific | 2019 |
| HDL Holdings (Sussex) Limited | Financial services | 2025 |
| Headstart Events Limited | Other services | 2012 |
| Healing Workshops Limited | Construction | 1989 |
| Hearcentres Limited | Wholesale & retail | 2011 |
| Hearing Electronics Limited | Health & social care | 1993 |
| Hearn Property Ltd | Construction | 2025 |
| Hearth Developments Ltd | Real estate | 2019 |
| HEARTS4CATS CIC | Other services | 2025 |
| Heat Technologies Limited | Construction | 2010 |
| Heath Construction Limited | Construction | 2010 |
| Heath Windows Southern Ltd | Construction | 2018 |
| Heathcote Electrical Services Ltd | Construction | 1997 |
| Hedgehog Advisory Ltd | Professional & scientific | 2023 |
| Hedley Lawrence Limited | Administrative & support | 2020 |
| HEL Mobile Limited | Wholesale & retail | 2023 |
| Helen Angel Tropic Limited | Wholesale & retail | 2026 |
| Helena Clayton Consulting Limited | Professional & scientific | 2015 |
| Helistyle Limited | Arts & recreation | 1996 |
| Helix AI Group Ltd | Information & communication | 2025 |
| Helix Corporation Ltd | Information & communication | 2022 |
| Hellohorsham Limited | Information & communication | 2012 |
| Helmswood Limited | Real estate | 2015 |
| Helsinki Deluxe Ltd | Information & communication | 2013 |
| Helter Skelter Productions Limited | Information & communication | 2003 |
| Hemesh Fillings UK Ltd | Wholesale & retail | 2020 |
| Hemesh Petroleum UK Ltd | Wholesale & retail | 2018 |
| Hemesh Retailers Ltd | Wholesale & retail | 2018 |
| Hemp Fabric Limited | Wholesale & retail | 2012 |