| Hjec Limited | Energy | 2014 |
| Hmjs Properties Limited | Real estate | 2020 |
| HML 2014 Ltd | Professional & scientific | 2014 |
| HML Developments Limited | Extraterritorial | 2025 |
| HMS 1 Ltd | Transport & logistics | 2017 |
| HN Halal Co Ltd | Hospitality | 2022 |
| Hobby Island Ltd | Wholesale & retail | 2025 |
| Holbrook Dubs Ltd | Wholesale & retail | 2020 |
| Hollie Homes Estate Agents Limited | Real estate | 2025 |
| Hollinghurst Analytics Ltd | Professional & scientific | 2023 |
| Hollow Hill Quantity Surveying Limited | Professional & scientific | 2017 |
| Home Farm Properties (Bridgend) Limited | Real estate | 2013 |
| Home Foody Limited | Wholesale & retail | 2022 |
| Homeinvestmentsales Ltd | Wholesale & retail | 2017 |
| Homeroots Energy Limited | Construction | 2025 |
| Homeworx Maintenance Limited | Administrative & support | 2019 |
| Hone and Jones Limited | Real estate | 1950 |
| Honest ADS Limited | Wholesale & retail | 2025 |
| Honest Craft Ltd | Real estate | 2025 |
| Hooper Locomotive Limited | Construction | 2015 |
| Horizon Control Systems Ltd | Professional & scientific | 2021 |
| Horizon Risk Management Limited | Financial services | 2014 |
| Horseshoe Payments Consulting Ltd | Professional & scientific | 2025 |
| Hostarch Limited | Extraterritorial | 2025 |
| Hostview Limited | Extraterritorial | 2026 |
| Hot JAM Studios Ltd | Education | 2022 |
| Hotpodyogabridgend Ltd | Arts & recreation | 2024 |
| House of Golf Limited | Arts & recreation | 2026 |
| Housemartin Building Services Ltd | Construction | 2011 |
| Houseofthella Limited | Transport & logistics | 2025 |
| HRA Developments Ltd | Real estate | 2026 |
| Hrhandson Limited | Administrative & support | 2013 |
| HT Foods Service Ltd | Hospitality | 2023 |
| Htic Limited | Professional & scientific | 2018 |
| HTJ Property Services Ltd | Construction | 2021 |
| Hudson BLU Limited | Wholesale & retail | 2020 |
| HUG by Laugh Ltd | Manufacturing | 2020 |
| Hugh Morris Limited | Wholesale & retail | 1959 |
| Hughes and Bird LLP | | 2025 |
| Hughes Land Developments Limited | Construction | 2015 |
| Hughes Solutions Ltd | Wholesale & retail | 2020 |
| Huis Legal Packs Ltd | Information & communication | 2024 |
| Hunsnet Ltd | Arts & recreation | 2020 |
| Hunter & Smoakes Limited | Professional & scientific | 2019 |
| Hurley (Exeter) Limited | Construction | 2020 |
| Hurley Decarbonisation Solutions Limited | Water & waste | 2021 |
| Hurstanimation Limited | Information & communication | 2013 |
| Hushhushpartywales Limited | Administrative & support | 2025 |
| Huxley Reed Limited | Professional & scientific | 2007 |
| HV Project Delivery Limited | Professional & scientific | 2026 |
| HW FAB Ltd | Manufacturing | 2020 |
| HW Powder Coating Ltd | Manufacturing | 2011 |
| Hybrid Heating & GAS Ltd | Construction | 2024 |
| Hydra VAC Ltd | Wholesale & retail | 2021 |
| Hydrover Turbines Ltd | Manufacturing | 2011 |
| Hyperion Trustees (UK) Limited | Financial services | 2025 |
| Hyperion Trustees Limited | Financial services | 2014 |
| I & R Transport Ltd | Transport & logistics | 2022 |
| I AM Woman Limited | Administrative & support | 2011 |
| I Sparkle (Chester) Limited | Other services | 2013 |
| I Wood Renewables Limited | Water & waste | 2016 |
| I-Spy Cctv Security Limited | Administrative & support | 2013 |
| Iain Gregory Ltd | Wholesale & retail | 2025 |
| IAN Davies Haulage Limited | Transport & logistics | 2002 |
| IAN Jones Cleaning and Maintenance Limited | Administrative & support | 2025 |
| IAN Morgan GAS Heating Plumbing Ltd | Construction | 2018 |
| IAR Projex Ltd | Other services | 2016 |
| Ibess Limited | Wholesale & retail | 2003 |
| Ibex Rope Access Solutions Ltd | Manufacturing | 2024 |
| Ibrar Optom Ltd | Wholesale & retail | 2024 |
| Idea Trader Limited | Wholesale & retail | 2024 |
| Ideal Business Limited | Administrative & support | 2004 |
| Ideal Media Today Ltd. | Information & communication | 2002 |
| Ideal Playtime Ltd | Arts & recreation | 2018 |
| IDH Development Ltd | Real estate | 2011 |
| IF Inspired Limited | Financial services | 2021 |
| Igloo Couriers Ltd | Transport & logistics | 2025 |
| Igmc Property Limited | Real estate | 2025 |
| Ignarus Limited | Information & communication | 2023 |
| Ignite Coffee Co Ltd | Manufacturing | 2025 |
| Iguana Heating and Plumbing Ltd. | Construction | 2018 |
| Ikat PMG Ltd | Real estate | 2025 |
| Ikfs Limited | Financial services | 2017 |
| Ikona (I.T.) Limited | Information & communication | 2002 |
| Ilarian Capital Ltd | Financial services | 2023 |
| Ilazar Limited | Health & social care | 2017 |
| Illuminate Marketing Consultancy Ltd | Professional & scientific | 2020 |
| Imagination Alive Productions Ltd | Arts & recreation | 2024 |
| Impact Neurofit CIC | Education | 2025 |
| Imperial Music Ltd | Arts & recreation | 2016 |
| Impetus Dance Community Interest Company | Health & social care | 2016 |
| In-Compass Consultants Limited | Professional & scientific | 2021 |
| In-Health (Chiropractic) Ltd | Health & social care | 2007 |
| Inathisoso Limited | Health & social care | 2023 |
| Inchcote Limited | Extraterritorial | 2025 |
| Inchgate Limited | Information & communication | 2026 |
| Inchmead Limited | Extraterritorial | 2025 |
| Inchview Limited | Extraterritorial | 2026 |
| Inchward Limited | Wholesale & retail | 2024 |
| Inchwell Limited | Extraterritorial | 2026 |