| Hough Associates Ltd | Professional & scientific | 2011 |
| Houghton (IW) Ltd | Construction | 2020 |
| Hounds the Barber Shop Limited | Other services | 2021 |
| House of Bremmjj Star Limited | Wholesale & retail | 2025 |
| House of Chilli Limited | Wholesale & retail | 2012 |
| House of Numbers Limited | Professional & scientific | 2021 |
| House of Sharing Limited | Real estate | 2023 |
| Housing People 1 Ltd | Real estate | 2022 |
| HOW Very Hannah Ltd | Professional & scientific | 2025 |
| Howard & Homer Properties Ltd | Real estate | 2026 |
| Howe Engineering Fabrications Ltd | Financial services | 2023 |
| Howell & Co (Holdings) Ltd | Financial services | 2022 |
| Howell & Co Properties Limited | Construction | 2021 |
| Howells Consultancy Ltd | Professional & scientific | 2024 |
| Howells Electrical Ltd | Construction | 2014 |
| Howells Morgan Management Limited | Professional & scientific | 2022 |
| Howle Accounting Services Limited | Professional & scientific | 2023 |
| Howle Manor Holdings Limited | Financial services | 2017 |
| Hpjv Solicitors Ltd | Professional & scientific | 2017 |
| HPM Property Services Limited | Administrative & support | 2018 |
| HR9 Promotions Ltd | Arts & recreation | 2021 |
| Hraira Empire Limited | Wholesale & retail | 2025 |
| HRD Property Limited | Real estate | 2023 |
| HRS Capital Limited | Financial services | 2022 |
| HRS Collective Limited | Wholesale & retail | 1982 |
| HS Holdings (2024) Ltd | Financial services | 2024 |
| HS Oriental Limited | Hospitality | 2019 |
| Hseq Services Ltd | Public administration | 2024 |
| HSJ Accountants Holdings Limited | Financial services | 2023 |
| HSJ Accountants Ltd | Professional & scientific | 2014 |
| HSJ Audit Limited | Extraterritorial | 2009 |
| Hsmlh Properties Ltd | Real estate | 2022 |
| HSO Two Ltd | Wholesale & retail | 2026 |
| HT (Newport) Ltd | Real estate | 2009 |
| HT Aesthetics It’S ALL About YOU Limited | Health & social care | 2024 |
| HTP Apprenticeship College Ltd | Education | 2000 |
| Huajee Limited | Hospitality | 2023 |
| Huajuan Ltd | Hospitality | 2017 |
| Huan YU Green Building Materials Technology Co Ltd | Construction | 2025 |
| Hub Bassaleg Store Limited | Wholesale & retail | 2022 |
| Hub Enterprises Newport Ltd | Construction | 2017 |
| Hub Petroleum Limited | Wholesale & retail | 2008 |
| Huddle Homes Ltd | Real estate | 2021 |
| Hughes Accountancy & Consulting Ltd | Professional & scientific | 2025 |
| Hughes Electrics Ltd | Construction | 2023 |
| Hughes N Limited | Wholesale & retail | 2023 |
| Hugoton Hosting LLP | | 2019 |
| Human Fuel Station Ltd | Hospitality | 2025 |
| Human Health Technologies Ltd | Professional & scientific | 2014 |
| Human Security Consultancy Ltd | Professional & scientific | 2025 |
| Human Space Furniture Limited | Manufacturing | 2024 |
| Humanity Through Grace Ltd | Health & social care | 2017 |
| Humber FAB Limited | Construction | 2017 |
| Humbleecommerce Limited | Wholesale & retail | 2026 |
| Hume Software Limited | Information & communication | 2016 |
| Humoni Ltd | Information & communication | 2024 |
| Hungarian Cultural Society of Newport C.I.C. | Hospitality | 2022 |
| Hungry Elephant Cearleon Ltd | Hospitality | 2025 |
| Hungry Haus Limited | Hospitality | 2022 |
| Hunnyhill Aquatics Limited | Wholesale & retail | 2003 |
| Hunnyhill Properties Limited | Real estate | 1999 |
| Hunt Automation Ltd | Professional & scientific | 2020 |
| Hunter Composites Ltd. | Manufacturing | 2024 |
| Hunter Logic Ltd | Wholesale & retail | 2016 |
| Hunter-Price Electrical Ltd | Construction | 2025 |
| Hunters Media Limited | Professional & scientific | 2025 |
| Hurley Services (Newport) Limited | Professional & scientific | 2010 |
| Hurricane Rentals Limited | Real estate | 2023 |
| Hush Venues Limited | Wholesale & retail | 2020 |
| Husphins Lane Equestrian Ltd | Agriculture & fishing | 2025 |
| Husszee Ltd | Transport & logistics | 2026 |
| HUT 6 Security Limited | Information & communication | 2016 |
| Hutchinson Plant Services Limited | Mining & quarrying | 2016 |
| Hute UR Hutes Limited | Health & social care | 2016 |
| HUW J Edmund Limited | Professional & scientific | 1999 |
| Huzefa Mobiles Limited | Wholesale & retail | 2025 |
| Huzz Motors Limited | Wholesale & retail | 2026 |
| HV Energy & Civils Ltd | Water & waste | 2015 |
| HV Renewable Energy Ltd | Construction | 2022 |
| HVH Power Services Ltd | Construction | 2025 |
| Hvlvconnect Ltd | Manufacturing | 2019 |
| Hyde Park IOW Hotels Ltd | Hospitality | 2024 |
| Hydeaway Homes Ltd | Real estate | 2025 |
| Hydrogeo Limited | Administrative & support | 2006 |
| Hydroluminum Cymru Limited | Manufacturing | 2025 |
| Hydromet Ltd | Manufacturing | 2025 |
| Hyfryd Homes Limited | Construction | 2019 |
| HYK Management Ltd | Construction | 2026 |
| Hymac-Direct Limited | Wholesale & retail | 2013 |
| Hynt Active Ltd | Wholesale & retail | 2025 |
| HYPERGLOBALMEGASYSTEMS2 Limited | Real estate | 2017 |
| Hypermotive Manufacturing Limited | Professional & scientific | 2013 |
| Hypersain Ltd | Extraterritorial | 2023 |
| I AM Curious Limited | Information & communication | 2016 |
| I D R I S Innovate Develop Renew Integrate Sustain Ltd | Health & social care | 2020 |
| I Design Structures Ltd | Professional & scientific | 2012 |
| I Packaging Ltd | Wholesale & retail | 2012 |
| I R Macrae Limited | Professional & scientific | 2021 |
| I W Vascular Ltd | Health & social care | 2023 |
| I'Ll BE in the Countess's Arms by Seven Limited | Other services | 1997 |