| Hilar Transport Ltd | Transport & logistics | 2014 |
| Hillbrow Eastbourne Limited | Construction | 2024 |
| Hillside Coffee Limited | Manufacturing | 2020 |
| Hillside Holdings (Sussex) Limited | Financial services | 2012 |
| Himani Enterprise Limited | Wholesale & retail | 2018 |
| Hinton & Moon Building Limited | Construction | 2022 |
| Hirecopter Limited | Transport & logistics | 2007 |
| HIT Enterprise London Limited | Wholesale & retail | 2023 |
| Hitch Innovation Group International Ltd | Professional & scientific | 2015 |
| Hive Store Limited | Wholesale & retail | 2010 |
| HIY Property Limited | Administrative & support | 2021 |
| HJ Commerce Ltd | Administrative & support | 2025 |
| HJ Developments Ltd | Real estate | 2023 |
| HJ Investment Group Ltd | Real estate | 2025 |
| HJA Heating Ltd | Construction | 2016 |
| HJR Marketing Ltd | Other services | 2023 |
| HK DI Limited | Health & social care | 2025 |
| HKB2 Limited | Professional & scientific | 2015 |
| HKM Holdings Ltd | Real estate | 2019 |
| HLT Investments Limited | Real estate | 2019 |
| HM Cuddon Forestry Limited | Agriculture & fishing | 2017 |
| HMD Seal/Less Pumps Limited | Manufacturing | 1946 |
| HMT Global Ltd | Wholesale & retail | 2020 |
| Hndl Contractors Ltd | Construction | 2026 |
| HO FAT Dental Limited | Health & social care | 2017 |
| Hobson & Latham Limited | Professional & scientific | 2008 |
| Hoda Mirjafari Ltd | Health & social care | 2026 |
| Hoeg Limited | Manufacturing | 1997 |
| Hoglet Will and POA Services Ltd | Administrative & support | 2024 |
| Hogs & Hens Limited | Information & communication | 2019 |
| Hola Kids Limited | Education | 2017 |
| Hold Tight Security LLP | | 2018 |
| Holland Quarter Ltd | Real estate | 2020 |
| Hollingum Electrical Ltd | Construction | 2015 |
| Hollis Dental Surgery Limited | Administrative & support | 2017 |
| Hollow Bone Limited | Health & social care | 2019 |
| Holloway Parade Ltd | Real estate | 2010 |
| Holly Blue PUB Ltd | Hospitality | 2024 |
| Holly Close Management Company Ltd | Households | 2018 |
| Holly Cole-Hawkins Limited | Health & social care | 2015 |
| Hollybank Residents Association Limited | Hospitality | 1982 |
| Holmesdale Investments Ltd | Real estate | 2007 |
| Holywell Management Company Limited | Households | 1981 |
| Home (Leaseco) Limited | Construction | 2018 |
| Home Carpets Ltd | Wholesale & retail | 2025 |
| Home Kitchens and Bathrooms Ltd | Manufacturing | 2023 |
| Home Options Direct Limited | Other services | 2012 |
| Home Portraits 4 U Limited | Administrative & support | 2007 |
| Homecare Building and Maintenance Limited | Construction | 2012 |
| Homes of Many Eastbourne Limited | Administrative & support | 2017 |
| HOMES4SAIL Ltd | Real estate | 2008 |
| Homesmaid Eastbourne Ltd | Administrative & support | 2019 |
| Homestay International (UK) Limited | Hospitality | 2013 |
| Honest Plaster Co. Ltd | Construction | 2023 |
| Honey Barrett (Audit) Ltd | Professional & scientific | 2017 |
| Honeybee Bookkeeping Limited | Professional & scientific | 2024 |
| Hong Davis Ltd | Health & social care | 2021 |
| Hong LI Food Ltd | Hospitality | 2011 |
| Hongwin Ltd | Wholesale & retail | 2025 |
| Honour Branding Limited | Administrative & support | 2004 |
| Hooftec Online Ltd | Agriculture & fishing | 2026 |
| Hook Dental Practice Limited | Health & social care | 2010 |
| Hope Community Enterprise CIC | Administrative & support | 2023 |
| Hope House Home Care Ltd | Health & social care | 2022 |
| Hopko Holdings Ltd | Professional & scientific | 2025 |
| Hopper Energy Ltd | Construction | 2026 |
| Horam Classic Restorations Limited | Wholesale & retail | 2003 |
| Horams Ltd | Construction | 2025 |
| Horizon Hub Supported Living Ltd | Health & social care | 2025 |
| Horizonsun Limited | Administrative & support | 2010 |
| Horner Wiggins Limited | Real estate | 2024 |
| Horselifetv Ltd | Information & communication | 2021 |
| Horsemove Ltd | Transport & logistics | 2009 |
| Horton Medical Ltd | Health & social care | 2014 |
| Hospitable Environment CIC | Arts & recreation | 2022 |
| Hospitality Pathways Limited | Education | 2024 |
| Hospitality With Heart Ltd | Hospitality | 2024 |
| Hospitaller Urology and Anaesthetics Ltd | Health & social care | 2026 |
| Hospitium Procuratio Ltd. | Hospitality | 2024 |
| Hot and Spice .Co.Uk Ltd | Hospitality | 2025 |
| Hot Chilli CRM Ltd | Information & communication | 2013 |
| Hotchkiss Group Holdings Limited | Construction | 2020 |
| Hotchkiss Group Pension Trustees Limited | Professional & scientific | 2022 |
| Hotchkiss Ltd | Construction | 1967 |
| Hotdog Driving Limited | Education | 2025 |
| Hotel Info Limited | Administrative & support | 2004 |
| Hotelslive Travel Management Limited | Administrative & support | 2015 |
| Hotspur Developments Limited | Households | 2001 |
| House 4 House Limited | Administrative & support | 2011 |
| House of Butcher Limited | Manufacturing | 2025 |
| House of Martin Limited | Professional & scientific | 2013 |
| House of Munic Ltd | Manufacturing | 2025 |
| House of Provence Ltd | Wholesale & retail | 2026 |
| House of Shaq Ltd | Wholesale & retail | 2024 |
| House of Steam Ltd | Other services | 2024 |
| House of Tofu Limited | Health & social care | 2025 |
| House RAW Ltd | Manufacturing | 2025 |
| Hove Kitchen Ltd | Hospitality | 2025 |
| Howard Smith Ltd | Administrative & support | 2015 |
| Howes Property Rentals Limited | Real estate | 2024 |