| Horsford Estates Ltd | Real estate | 2026 |
| Horsford Group Ltd | Construction | 2022 |
| Hortos Ltd | Administrative & support | 2026 |
| Hospice in the Weald | Health & social care | 1980 |
| Hospice in the Weald (Trading) Limited | Wholesale & retail | 1985 |
| Hospitality Operations Limited | Hospitality | 2012 |
| Host My Office Ltd | Information & communication | 2016 |
| Hot Hatch Hero's Limited | Agriculture & fishing | 2016 |
| Hot Haus Ltd | Other services | 2024 |
| Hotfeed Ltd | Information & communication | 2024 |
| Hotpartition Ltd | Information & communication | 2025 |
| Houdini's Magic Bar Ltd | Hospitality | 2016 |
| Houghton Consult Limited | Professional & scientific | 2018 |
| Houghton Consulting Limited | Administrative & support | 2008 |
| House of Boyds Limited | Information & communication | 2015 |
| House of Sunshine Investments Ltd | Wholesale & retail | 2025 |
| HOW & Co | | 1993 |
| HOW2BECOME Limited | Information & communication | 2005 |
| Howamidoingatthis Ltd | Health & social care | 2022 |
| Howard & Fairhall LLP | | 2020 |
| Howard Creative Design Limited | Arts & recreation | 2015 |
| Howes Precision Welding Ltd | Manufacturing | 2025 |
| Hpowdrill Ltd | Professional & scientific | 2026 |
| HPS Civils Limited | Construction | 2019 |
| HPS Estates Ltd | Real estate | 2016 |
| HR Advise ME Limited | Administrative & support | 2007 |
| HR Legal Solutions Ltd | Administrative & support | 2023 |
| HRA Plus Limited | Extraterritorial | 2014 |
| HS Automotive Experts Ltd | Wholesale & retail | 2024 |
| HS Nordic Ltd | Wholesale & retail | 2023 |
| HSF Solutions Ltd | Information & communication | 2016 |
| Huckleberry Consulting Ltd | Professional & scientific | 2026 |
| Hug-Many Ltd | Arts & recreation | 2011 |
| Hugletts Farm Ltd | Agriculture & fishing | 2020 |
| Hugletts Property Limited | Real estate | 2023 |
| Human Hatstand Limited | Professional & scientific | 2024 |
| Humanitas Editing and Proofreading Limited | Education | 2024 |
| Humble Technology Ltd | Professional & scientific | 2012 |
| Hummingbird Consultancy Ltd | Information & communication | 2012 |
| Hungershall Partners Limited | Extraterritorial | 2017 |
| Hungry Harry's Foods Ltd | Hospitality | 2025 |
| Hunt Stephenson Plumbing & Heating Limited | Construction | 2017 |
| Hunter Sports Management Ltd | Professional & scientific | 2021 |
| Hunters Lodge Management Company Limited | Real estate | 1984 |
| Huntfield Properties Limited | Real estate | 2024 |
| Huoman Limited | Wholesale & retail | 2019 |
| Hurst Management Limited | Professional & scientific | 2019 |
| Hurstfield (Ticehurst) Limited | Households | 2006 |
| Hurstleigh Freehold Limited | Households | 2025 |
| Hurstsandbrune Limited | Professional & scientific | 2018 |
| Hushed Planet Ltd | Information & communication | 2020 |
| Hustle Direct Ltd | Administrative & support | 2021 |
| HUX HR Solutions Limited | Administrative & support | 1997 |
| Hvbg Limited | Professional & scientific | 2016 |
| HVC Limited | Construction | 2004 |
| Hvdm Limited | Information & communication | 2024 |
| HWH Developments Limited | Construction | 2003 |
| HWH Estate Management LLP | | 2011 |
| Hydra Media Ltd | Information & communication | 2018 |
| Hydramatix Limited | Extraterritorial | 1999 |
| Hydro Leisure Group Ltd | Administrative & support | 2025 |
| Hygiene SUE Limited | Extraterritorial | 2014 |
| Hyper Axis Ventures Ltd | Professional & scientific | 2025 |
| Hyper Connect Ltd | Information & communication | 2025 |
| Hypera Ltd | Professional & scientific | 2026 |
| Hyperclicks Limited | Information & communication | 2008 |
| Hypership Cloud Ltd | Information & communication | 2024 |
| I & O European Limited Liability Partnership | | 2007 |
| I Believe Management Ltd | Administrative & support | 2018 |
| I Love WOK Ltd | Hospitality | 2016 |
| I S D Geethan Ltd | Hospitality | 2018 |
| I Wish I HAD Limited | Extraterritorial | 2000 |
| I'M Sorry Dave Limited | Information & communication | 2026 |
| I-Teeth Limited | Health & social care | 2005 |
| I4AA Ltd | Real estate | 2026 |
| I4LA Limited | Real estate | 2021 |
| IA Pollard Properties Ltd | Real estate | 2024 |
| IAM4PEOPLE Ltd | Professional & scientific | 2022 |
| IAN Anderson (Projects) Ltd | Professional & scientific | 2018 |
| IAN Chatfield Limited | Wholesale & retail | 2015 |
| Iaysha Art Studio Limited | Arts & recreation | 2024 |
| Iaysha Contemporary Fine Art Limited | Arts & recreation | 2014 |
| IB CDM Limited | Construction | 2012 |
| IB Labs Ltd | Wholesale & retail | 2023 |
| IB Retail Limited | Wholesale & retail | 2025 |
| Ibeautify Ltd | Other services | 2020 |
| IC TAC Ltd | Manufacturing | 2026 |
| Icarus Productions Limited | Professional & scientific | 2013 |
| Icarus Technologies Limited | Information & communication | 2025 |
| ICC Group Holdings Limited | Financial services | 2001 |
| Ice Black Belt Schools Limited | Education | 2023 |
| Iceberg Real Estate Limited | Real estate | 2025 |
| Icebow Leadership and Performance Coaching Ltd | Professional & scientific | 2024 |
| ICH Dien Tunbridge Wells Ltd | Hospitality | 2024 |
| Ickle Properties Limited | Real estate | 1997 |
| ICL Assets LLP | | 2012 |
| Icova Ltd | Information & communication | 2022 |
| IDC Develop Limited | Construction | 2012 |
| IDC Real Estate Limited | Professional & scientific | 2011 |
| Idea Republic Ltd | Other services | 2013 |