| Henry R Broughton Automotive Limited | Wholesale & retail | 2012 |
| Henry Spiller Racing Limited | Arts & recreation | 2023 |
| Hentilbea Limited | Professional & scientific | 2025 |
| Heritage Home Interiors and Antiques Ltd | Wholesale & retail | 2025 |
| Herringswell Homes Ltd | Construction | 2021 |
| Herringswell Liveries Ltd | Agriculture & fishing | 2023 |
| Hester Hospitality Ltd | Hospitality | 2025 |
| Hewingbere Bloodstock Ltd | Agriculture & fishing | 2011 |
| Hexford Meadery Ltd. | Manufacturing | 2025 |
| HFS 1991 Limited | Extraterritorial | 1950 |
| HGM Analysis Limited | Information & communication | 2006 |
| HH Financial Consultancy Limited | Professional & scientific | 2022 |
| Hi-View Scaffolding Ltd | Construction | 2021 |
| Hibble Decorators Limited | Construction | 2022 |
| Hideaways Holidays Group Limited | Real estate | 2016 |
| High Elms Partnership | | 1996 |
| Higher Access Scaffolding Limited | Construction | 2023 |
| Highfield Bloodstock Limited | Agriculture & fishing | 2018 |
| Highflyer Bloodstock Agency Limited | Agriculture & fishing | 2001 |
| Highland Carpets Limited | Wholesale & retail | 2023 |
| Hill Construction (Cambs) Limited | Construction | 2019 |
| Hill House Automotive Limited | Wholesale & retail | 2024 |
| Hinchingbrooke Water Tower Limited | Real estate | 2005 |
| HJR Ltd | Construction | 2025 |
| HK Racing Limited | Agriculture & fishing | 2019 |
| HKF Foods Limited | Hospitality | 2021 |
| HLF Holdings Ltd | Financial services | 2024 |
| HLF Investments Ltd | Real estate | 2020 |
| HLM Agri Limited | Agriculture & fishing | 2018 |
| HN Ltd | Extraterritorial | 2009 |
| Hochste Doors Ltd | Manufacturing | 2021 |
| Holiday Property Bond Limited | Extraterritorial | 1981 |
| Holidays Direct Marketing (Southern) Limited | Professional & scientific | 1995 |
| Holistic People Limited | Administrative & support | 2006 |
| Home Loving Designs Ltd | Professional & scientific | 2025 |
| HON & Co Property Holdings (UK) Limited | Real estate | 2020 |
| Hooked Tackle Limited | Wholesale & retail | 2011 |
| Hoopers Limited | Professional & scientific | 1929 |
| Hoopers of Colchester Limited | Extraterritorial | 1965 |
| Hoopers of Wilmslow Limited | Extraterritorial | 1901 |
| Hoorain&Kinza Ltd | Wholesale & retail | 2025 |
| Hopkins Bloodstock Limited | Professional & scientific | 2026 |
| Hopson Properties Limited | Real estate | 2021 |
| Horse Racing Solutions Ltd | Other services | 2024 |
| Horton Racing Limited | Arts & recreation | 2023 |
| Hounded Ltd | Other services | 2025 |
| House of B Properties Ltd | Real estate | 2024 |
| House of Venues Ltd | Administrative & support | 2026 |
| HOW to Talk to Robots Ltd | Professional & scientific | 2016 |
| HOW to Talk to Robots Productions Ltd | Information & communication | 2025 |
| HPB Bond Loans Limited | Financial services | 2021 |
| HPB Finance Limited | Financial services | 2005 |
| HPB Loans Limited | Financial services | 2014 |
| HPB Tenancies Limited | Real estate | 2000 |
| HPB Travel Club Holdings PLC | Administrative & support | 1985 |
| HPB Travel Club Limited | Administrative & support | 1986 |
| HQ Heating & Plumbing Ltd | Construction | 2019 |
| HS Ltd | Extraterritorial | 2008 |
| HU Ltd | Extraterritorial | 2008 |
| Hub Genies Ltd | Information & communication | 2026 |
| Huckle Developments Limited | Real estate | 2016 |
| Huffsport Ltd | Arts & recreation | 2024 |
| Huggan Bloodstock Limited | Agriculture & fishing | 2002 |
| Human Biosample Consultants Ltd | Professional & scientific | 2024 |
| Hundon Close Residents' Association Limited | Households | 2009 |
| Hundon Green Bloodstock Limited | Agriculture & fishing | 2023 |
| Hundred Health Ltd | Professional & scientific | 2021 |
| Hunnimoss Films Ltd | Information & communication | 2019 |
| Hunston Property Ltd | Real estate | 2026 |
| Huntingdon Steeplechases Limited | Arts & recreation | 1992 |
| Hurworth Bloodstock Limited | Information & communication | 2019 |
| Hustle Ipswich Limited | Other services | 2017 |
| HV Ltd | Extraterritorial | 2008 |
| Hwlc Ltd | Transport & logistics | 2022 |
| HY Limited | Extraterritorial | 2007 |
| Hyde Burgess Design Limited | Real estate | 1986 |
| Hydeas Technology Ltd | Information & communication | 2025 |
| Hydrografix Limited | Professional & scientific | 2018 |
| Hyline Security (UK) Limited | Administrative & support | 2012 |
| Hyperlite Studios Ltd | Information & communication | 2018 |
| Hyrox Performance Limited | Arts & recreation | 2022 |
| I AM Cyan Design Ltd | Arts & recreation | 2020 |
| I Ltd | Extraterritorial | 2021 |
| Iain Mahony Personal Trainer Ltd. | Other services | 2012 |
| Iamonline.Biz Ltd | Information & communication | 2008 |
| IAN Polson LLP | | 2017 |
| Iced Aesthetics Ltd | Other services | 2024 |
| Iceni Geotechnical Services Ltd | Professional & scientific | 2022 |
| Ideal Motion Limited | Hospitality | 1997 |
| IFM Broxtead Ltd. | Agriculture & fishing | 2025 |
| IH Ltd | Extraterritorial | 2022 |
| IJ Ltd | Extraterritorial | 2009 |
| IJS Innovation Limited | Professional & scientific | 2023 |
| IK Limited | Extraterritorial | 2020 |
| Illumination Management and Consultancy Ltd | Extraterritorial | 2023 |
| Impact Bloodstock Limited | Agriculture & fishing | 2013 |
| Impact Leaders Limited | Education | 2014 |
| Impactdigi Limited | Professional & scientific | 2022 |
| Imperium Syndicate Limited | Agriculture & fishing | 2020 |
| Imsg Constructions Ltd | Construction | 2025 |