| Hempstead Farm Ltd | Real estate | 2020 |
| Henfield Healthcare Solutions Ltd | Health & social care | 2020 |
| Henry Adams (Horsham Lettings) LLP | | 2015 |
| Henry Adams (Horsham) LLP | | 2008 |
| Henry Adams HRR Commercial Ltd | Real estate | 2021 |
| Henry Adams HRR Land and New Homes Ltd | Real estate | 2022 |
| Henry Adams HRR Limited | Real estate | 2018 |
| Henry George Thomas Ltd | Professional & scientific | 2023 |
| Herbert Direct Limited | Wholesale & retail | 2003 |
| Herbert Hedley Limited | Professional & scientific | 2017 |
| Here IS George Ltd | Information & communication | 2018 |
| Heron Painters & Decorators Limited | Construction | 1999 |
| Herontye Golf Ltd | Wholesale & retail | 2025 |
| Hertsmere Golf Limited | Arts & recreation | 2020 |
| Hestia Talent Partners Limited | Professional & scientific | 2023 |
| Hewett Developments Limited | Real estate | 1986 |
| Hexium Consulting Ltd | Professional & scientific | 2026 |
| Hexla Limited | Professional & scientific | 2021 |
| Hexla Somerset Limited | Professional & scientific | 2025 |
| Heycroft Consulting Limited | Professional & scientific | 2016 |
| Heylios Ltd | Professional & scientific | 2019 |
| Heywood Carers Limited | Health & social care | 2012 |
| HGS Southern Limited | Administrative & support | 2020 |
| HH Electricals and Renewables Limited | Construction | 2025 |
| Hi-Tech Office Services Limited | Real estate | 1989 |
| HIE Estate Management Ltd | Real estate | 2018 |
| High Gain Event Services C.I.C. | Arts & recreation | 2011 |
| High Performance Media Limited | Information & communication | 2021 |
| High Sports Holdings Limited | Professional & scientific | 2014 |
| High Weald Financial Ltd | Financial services | 2025 |
| High Weald IP Ltd | Financial services | 2025 |
| Highcroft Consultancy Limited | Professional & scientific | 2023 |
| Highdown Estates Limited | Construction | 2016 |
| Highfield Grange (Guildford) Management Co. Ltd. | Households | 2017 |
| Highview Roofing Limited | Construction | 2022 |
| Hill Technology Solutions Ltd | Information & communication | 2026 |
| Hillersdon Consulting Ltd | Professional & scientific | 2018 |
| Hillside Property Investments Ltd | Real estate | 2019 |
| Hilton Croft Ltd | Manufacturing | 1998 |
| Hines Services Ltd | Wholesale & retail | 2022 |
| Hintlesham Holdings Limited | Financial services | 1986 |
| Hire Sussex Ltd | Administrative & support | 2023 |
| Hive HR Solutions Ltd | Administrative & support | 2018 |
| Hive Media Control Ltd | Manufacturing | 2017 |
| Hive Telecom Limited | Information & communication | 2022 |
| HJI Lifestyle Ltd | Hospitality | 2024 |
| HK 25 Limited | Hospitality | 2022 |
| HMG Industries Limited | Information & communication | 2011 |
| HML Acquisitions Limited | Financial services | 2023 |
| HML Capital Ltd | Real estate | 2024 |
| HML Estates Ltd | Real estate | 2024 |
| HML Holdings Ltd | Financial services | 2024 |
| HML Ventures Ltd | Financial services | 2022 |
| Hoadley and Geal Properties Ltd | Hospitality | 1980 |
| Hodder Plumbing Limited | Construction | 2023 |
| Hodges & Hodges Ltd. | Wholesale & retail | 2021 |
| Hodgessecurityconsultantandsocialmediamarketing Ltd | Professional & scientific | 2026 |
| Hoey Media Limited | Information & communication | 2022 |
| Holbeach Market Ltd | Wholesale & retail | 2024 |
| Holbook Copse Management Ltd | Households | 2025 |
| Hold My Beer Ltd | Financial services | 2022 |
| Holloway Hinton Finance Limited | Financial services | 2026 |
| Holly Farm Close Management Limited | Households | 2022 |
| Holm Global Limited | Wholesale & retail | 1991 |
| Holm Group Holdings Limited | Financial services | 2024 |
| Holmbush Fencing Supplies Limited | Construction | 2009 |
| Holmbush Flowers and Investments Ltd | Health & social care | 2013 |
| Holmbush Game Limited | Wholesale & retail | 2023 |
| Holmbush Management Company Limited | Households | 1977 |
| Holmes Palmer Contract Management Services Ltd | Construction | 2016 |
| Holmes Park Ltd | Real estate | 2025 |
| Holmewood Interiors Limited | Construction | 2017 |
| Holt END House Investments Limited | Financial services | 2023 |
| Home & Lifestyle Improvements Ltd | Construction | 2018 |
| Home Hub Smart Solutions Limited | Information & communication | 2024 |
| Home in One Financial Services Limited | Administrative & support | 2000 |
| Home in One Mortgages Limited | Administrative & support | 2000 |
| Home Internet Limited | Information & communication | 2022 |
| Home Rents (Sussex) Ltd | Real estate | 2022 |
| Home SOS Ltd | Financial services | 2025 |
| Home Switcher Limited | Information & communication | 2025 |
| Home Telecom Limited | Information & communication | 2010 |
| Homedin Limited | Real estate | 2017 |
| Homeguys Limited | Construction | 2025 |
| Homelands Equestrian Ltd | Agriculture & fishing | 2010 |
| Hometalent Limited | Extraterritorial | 1996 |
| Hometown Business Limited | Administrative & support | 2025 |
| Homeview GAS and Heating Limited | Other services | 2015 |
| Homeworld Appliances Limited | Wholesale & retail | 2015 |
| Honorem Investments Limited | Real estate | 2021 |
| Hook House Leisure Limited | Administrative & support | 2016 |
| Hoole Auto Solutions Limited | Wholesale & retail | 2016 |
| Hope Inns LLP | | 2011 |
| Horizon Executive Search International Limited | Administrative & support | 2007 |
| Hornbrook Copse Residents Association Limited | Households | 1990 |
| Horsham & District Laundry Ltd. | Administrative & support | 1994 |
| Horsham (Plumbing & Heating Supplies) Limited | Wholesale & retail | 1988 |
| Horsham 9 Seater Self Drive Limited | Administrative & support | 2024 |
| Horsham Accountancy Services Ltd | Professional & scientific | 1996 |
| Horsham and Crawley Counselling Group CIC | Health & social care | 2015 |