| Healthnix, Inc. | | 2025 |
| Healthy Unwind Ltd | Wholesale & retail | 2024 |
| Hellfire Events Ltd | Arts & recreation | 2023 |
| Help OUR Town Dover CIC | Wholesale & retail | 2024 |
| Helpful IT Solutions Ltd | Other services | 2026 |
| Hel’S House Gym Ltd | Arts & recreation | 2021 |
| Hemingford Elia Limited | Real estate | 1965 |
| Hemingford Holdings Limited | Professional & scientific | 2021 |
| Henry's Pool Café Ltd | Hospitality | 2023 |
| Heritage Plastering and Conversions Ltd | Construction | 2015 |
| Heritage Today Ltd | Hospitality | 2019 |
| Herne Bay Dentures Limited | Health & social care | 2011 |
| Heron Lodge Management Company Limited | Households | 1992 |
| Heron Main Limited | Construction | 2026 |
| Heron Property Services Limited | Construction | 2006 |
| Herts Chauffeur Ltd | Transport & logistics | 2013 |
| Hesketh Homes (Kent) Limited | Construction | 2021 |
| Hewbourn Limited | Agriculture & fishing | 2003 |
| Hewertson Limited | Construction | 2025 |
| HGM Property Holdings Ltd | Real estate | 2025 |
| HGT Construction Ltd | Construction | 2010 |
| HH Promotions Events Ltd | Arts & recreation | 2025 |
| HH Promotions North Limited | Extraterritorial | 2013 |
| HH Promotions South Limited | Arts & recreation | 2012 |
| Hickson Bros. Limited | Agriculture & fishing | 1982 |
| Hidden Way Ltd | Extraterritorial | 2009 |
| High Court Warrants South East Limited | Administrative & support | 2019 |
| Hinkins & Hinkins Ltd | Construction | 2017 |
| Hipperson Limited | Construction | 1995 |
| HIS Pastry Ltd | Manufacturing | 2020 |
| Hiya Burger Invest Ltd | Extraterritorial | 2023 |
| Hiya Burger Ltd | Extraterritorial | 2023 |
| HJM Unique Aesthetics Ltd | Other services | 2019 |
| HJR Products Limited | Wholesale & retail | 2018 |
| HJS Solutions Limited | Construction | 2025 |
| HKN Transport Ltd | Transport & logistics | 2025 |
| HLP Infrastructures Invest Ltd | Extraterritorial | 2025 |
| HLP Infrastructures Ltd | Extraterritorial | 2025 |
| Holdar Property Services Limited | Real estate | 2023 |
| Hollis Motors Limited | Professional & scientific | 1962 |
| Holmesdale Mews Management Limited | Extraterritorial | 2002 |
| Home Improvement Design Co. Limited | Wholesale & retail | 1992 |
| Home Safe (UK) Ltd | Construction | 2011 |
| Home-Start Dover District | Other services | 2003 |
| Homestead Land Limited | Real estate | 2012 |
| Hometask Ltd | Construction | 2026 |
| Honeysuckle Times Limited | Hospitality | 2023 |
| Hoodu Ltd | Information & communication | 2024 |
| Hooga Health & Wellbeing Ltd | Education | 2020 |
| Hoops Dover Ltd | Hospitality | 2023 |
| Hope Financial Planning Ltd | Financial services | 2024 |
| Hope Inn Property Maintenance Company Limited | Households | 2023 |
| Hopkins Lettings Limited | Real estate | 2024 |
| Horizon Construction and Building Services Ltd | Construction | 2025 |
| Horizon Helicopter Services Invest Ltd | Professional & scientific | 2024 |
| Horizon Helicopter Services Ltd | Extraterritorial | 2024 |
| Hough & Hennessy Developments Ltd | Real estate | 2025 |
| Hougham Brickwork and Plastering Services Ltd | Construction | 2025 |
| Hougham Heating & Plumbing Ltd | Construction | 2001 |
| Hounslow Lettings Ltd | Households | 2019 |
| House of Blackwood Ltd | Professional & scientific | 2017 |
| Hpbc Limited | Hospitality | 2026 |
| Hpbg Limited | Wholesale & retail | 2026 |
| HS Woodturning Ltd | Information & communication | 2021 |
| HTG International Ltd | Extraterritorial | 2009 |
| Htge Ltd | Extraterritorial | 2009 |
| HTW Construction Limited | Construction | 2012 |
| Hugo Blox Management Services Limited | Administrative & support | 2020 |
| Hugpedia Corp Ltd | Administrative & support | 2023 |
| Hunters Hairdressing (Dover) Ltd | Other services | 2003 |
| Huntley Sloan Consulting Ltd | Professional & scientific | 2023 |
| Hurb Ventures Ltd | Construction | 2023 |
| Hybrid Complete Construction Ltd | Construction | 2026 |
| Hydration Station Ltd | Manufacturing | 2017 |
| Hyperecho Limited | Health & social care | 2020 |
| Hypertherm UK, LLC | | 2004 |
| Hythe Bay Metals Limited | Financial services | 2019 |
| Hythe Service Station Holdings Limited | Other services | 2017 |
| Hythe Service Station Limited | Wholesale & retail | 2015 |
| I Choose Local Technology Solutions Limited | Professional & scientific | 2023 |
| I-55 Developments Ltd | Construction | 2015 |
| Ibaa Kent Limited | Health & social care | 2022 |
| IBL Global Limited | Professional & scientific | 2023 |
| IBO Haircare Limited | Other services | 2025 |
| Ibrakabi Invest Ltd | Extraterritorial | 2025 |
| Ibrakabi Ltd | Extraterritorial | 2025 |
| Ibrit Limited | Wholesale & retail | 2011 |
| Iceberg Business Support Limited | Professional & scientific | 2015 |
| Icon Enterprise Ltd | Real estate | 2023 |
| Iconic Invest and Trade Ltd | Administrative & support | 2017 |
| ICW Builders Ltd | Construction | 2022 |
| IHS Building Services Limited | Professional & scientific | 2019 |
| Iiot Solutions Ltd | Professional & scientific | 2018 |
| Iirina Bakery Ltd | Construction | 2023 |
| Ikigai SAN Invest Ltd | Extraterritorial | 2025 |
| IL EL Capo Ltd | Extraterritorial | 2024 |
| ILA OIL & GAS Services Ltd | Professional & scientific | 2012 |
| Immo Jules Ltd | Construction | 2025 |
| Immo Nameche Invest Ltd | Extraterritorial | 2022 |
| Immo Nameche Ltd | Extraterritorial | 2022 |