| Horsham BID Ltd | Other services | 2024 |
| Horsham Boiler and Heating Services Ltd | Construction | 2011 |
| Horsham Catering Ltd | Hospitality | 2025 |
| Horsham Community Football Club Limited | Arts & recreation | 2022 |
| Horsham Computers Limited | Other services | 1999 |
| Horsham Coworking Ltd | Administrative & support | 2016 |
| Horsham Creative Ltd | Extraterritorial | 2023 |
| Horsham Debt Advice Service | Professional & scientific | 2003 |
| Horsham Desserts Limited | Hospitality | 2020 |
| Horsham District Homes (Holdings) Limited | Real estate | 2019 |
| Horsham District Homes Limited | Construction | 2019 |
| Horsham District Indoor Bowls Club Limited | Arts & recreation | 1995 |
| Horsham Dyslexia Assessments Ltd | Education | 2024 |
| Horsham Engraving Co.Limited | Manufacturing | 1966 |
| Horsham Fencing Limited | Professional & scientific | 1992 |
| Horsham Financial Services Limited | Financial services | 1989 |
| Horsham Fitness Limited | Other services | 2021 |
| Horsham Food and Wine Ltd | Wholesale & retail | 2023 |
| Horsham Football Club C.I.C. | Arts & recreation | 1980 |
| Horsham Gymnastics Centre Ltd | Arts & recreation | 2001 |
| Horsham Hand Car Wash Ltd | Wholesale & retail | 2011 |
| Horsham Hawks Basketball Club CIC | Other services | 2024 |
| Horsham Historics Preservation Society Limited | Other services | 2006 |
| Horsham Laboratories Ltd | Manufacturing | 2022 |
| Horsham Landscaping Specialists Ltd | Administrative & support | 2021 |
| Horsham Learning Alliance | Education | 2025 |
| Horsham Masonic Hall Limited | Real estate | 1939 |
| Horsham Matters Ltd | Wholesale & retail | 2006 |
| Horsham Mini Market Ltd | Wholesale & retail | 2025 |
| Horsham Mixed Martial Arts Academy Limited | Education | 2019 |
| Horsham Motor Services Limited | Extraterritorial | 2024 |
| Horsham Organic Herbs and Botanicals (Hohb) Ltd | Wholesale & retail | 2018 |
| Horsham Pizza Plus Ltd | Hospitality | 2023 |
| Horsham Plumbers Limited | Construction | 2025 |
| Horsham Prints and Webs Ltd | Manufacturing | 2025 |
| Horsham Property Ltd | Real estate | 2020 |
| Horsham Records Ltd | Wholesale & retail | 2024 |
| Horsham Refrigeration Limited | Manufacturing | 2003 |
| Horsham Rugby Trading Limited | Arts & recreation | 2021 |
| Horsham Salt Spa Ltd | Health & social care | 2025 |
| Horsham Scaffolding Ltd | Construction | 2017 |
| Horsham Spiritual and Healing Centre CIC | Administrative & support | 2023 |
| Horsham Sports Club Trading Ltd | Arts & recreation | 2023 |
| Horsham Sports Services Ltd | Education | 2020 |
| Horsham Store and Wine Ltd | Wholesale & retail | 2026 |
| Horsham Talk Time Limited | Health & social care | 2021 |
| Horsham Town Community Partnership | Administrative & support | 2011 |
| Horsham Town Football Club Ltd | Arts & recreation | 2013 |
| Horsham Windows and Doors Ltd | Extraterritorial | 2010 |
| Horsham YM Community Sports Club CIC | Arts & recreation | 2024 |
| Horshamsubway Limited | Hospitality | 2021 |
| Hortus Planta Ltd | Wholesale & retail | 2022 |
| Hoskin Productions Limited | Information & communication | 2022 |
| Host Global Limited | Information & communication | 1999 |
| Hotbox Spa Ltd | Arts & recreation | 2025 |
| Hotpod Yoga Horsham Ltd | Arts & recreation | 2023 |
| Hough Property Management Limited | Real estate | 2020 |
| Houghtonj Ltd | Information & communication | 2022 |
| Hounsome Homes Ltd | Real estate | 2009 |
| House Go Gardens Ltd | Real estate | 2007 |
| House of Torvellan IP Ltd | Financial services | 2025 |
| Housego Holdings Ltd | Real estate | 2024 |
| Household Automation Limited | Construction | 2000 |
| Housey Property Ltd | Real estate | 2023 |
| HOW Group (Property) Ltd | Real estate | 2024 |
| Howard Electrical Limited | Construction | 1984 |
| Howard King Tree Surgeons Limited | Agriculture & fishing | 2010 |
| Howfast Limited | Arts & recreation | 2001 |
| Howth Consultancy Ltd | Professional & scientific | 2017 |
| HP Valeting & Detailing Ltd | Administrative & support | 2022 |
| HQ Law Limited | Professional & scientific | 2016 |
| HRR Holdings Ltd | Financial services | 2024 |
| Hs(Uk) Technology Limited | Information & communication | 2003 |
| HSM Global Holdings Limited | Financial services | 2019 |
| HSM Global Limited | Transport & logistics | 2008 |
| HT Motor Services Ltd | Wholesale & retail | 2017 |
| HT Plumbing & Building Services Ltd | Construction | 2013 |
| Hubs Limited | Wholesale & retail | 2003 |
| Hudello Limited | Administrative & support | 2020 |
| Hudson Estates Ltd | Administrative & support | 2025 |
| Huggybarbar Ltd | Other services | 2025 |
| Hugh & James Ltd | Wholesale & retail | 2026 |
| Hugh Chapman Studio Limited | Arts & recreation | 2012 |
| Hughen Limited | Wholesale & retail | 2012 |
| Human Capital Index Limited | Administrative & support | 2005 |
| Human Capital Solutions Search Limited | Administrative & support | 2015 |
| Human Values Foundation | Information & communication | 1995 |
| Hunch Investments Ltd | Construction | 2025 |
| Hungerhill Estates (1994) Limited | Extraterritorial | 1994 |
| Hungers Field Limited | Real estate | 2015 |
| Hungry Dwarf Foods Ltd | Hospitality | 2026 |
| Hungry Hounds (Southwater) Ltd | Wholesale & retail | 2025 |
| Hunic Limited | Real estate | 1964 |
| Hunt Brickwork Ltd | Construction | 2025 |
| Hurst Mckee Ltd | Health & social care | 2017 |
| Hurst Park (Horsham) Management Ltd. | Households | 2007 |
| Hurst Space CIC | Hospitality | 2022 |
| Husse Gatwick Ltd | Wholesale & retail | 2023 |
| HW HR Consulting Limited | Professional & scientific | 2004 |
| Hydra Jetting Ltd | Administrative & support | 2016 |