| Holywell Properties LLP | | 2012 |
| HOME4CARE Ltd | Health & social care | 2020 |
| Homes & Developments Ltd | Real estate | 2024 |
| Hope House (Lottery) Ltd | Arts & recreation | 2004 |
| Hope House (Trading) Limited | Wholesale & retail | 1992 |
| Hope House Children's Hospices | Health & social care | 1991 |
| Horizon Estates Limited | Construction | 2003 |
| Host Collective Ltd | Hospitality | 2025 |
| Hot Skies Limited | Transport & logistics | 2003 |
| Housman Tree Services Ltd | Agriculture & fishing | 2024 |
| HR HR Consult Limited | Administrative & support | 2025 |
| HR Solutions (JP) Ltd | Administrative & support | 2015 |
| HSJ Plumbing & Heating Ltd | Construction | 2024 |
| HTC Wines Limited | Hospitality | 2024 |
| Hu's Property Limited | Real estate | 2024 |
| Huez Investments Limited | Financial services | 2022 |
| Hughes Agri Oswestry Limited | Wholesale & retail | 2025 |
| Hughes Bros (Oswestry) Limited | Wholesale & retail | 2022 |
| Hunter Bevan Limited | Administrative & support | 1999 |
| Hunters Moon New Hedges Limited | Hospitality | 2023 |
| Husk Architectural Ltd | Manufacturing | 2018 |
| Hustle Motorsport Ltd | Wholesale & retail | 2023 |
| HUW E Watkin Building Contractor Limited | Construction | 2014 |
| HV Substation Safety Services Ltd | Construction | 2026 |
| Hygenol Cleaning Supplies Ltd | Manufacturing | 2000 |
| Hyperfood (UK) Ltd | Wholesale & retail | 2018 |
| Hyton Poultry Limited | Agriculture & fishing | 1967 |
| I & P Balkan Foods Ltd | Manufacturing | 2025 |
| I Gwilliam & Sons Limited | Construction | 2000 |
| I Hill Roofing Ltd | Construction | 2018 |
| I S Fusion Limited | Manufacturing | 2005 |
| I S T Properties Ltd | Real estate | 2015 |
| I'Anson Burns Ltd | Professional & scientific | 2023 |
| I.M.A. Chicos Limited | Hospitality | 2024 |
| IAT Enterprises Ltd | Real estate | 2016 |
| Icephorm Limited | Wholesale & retail | 2011 |
| Ichor Consulting Ltd | Professional & scientific | 2002 |
| Icolan Limited | Professional & scientific | 2013 |
| Identical Eight Limited | Arts & recreation | 2019 |
| Idigi Cyber Limited | Information & communication | 2025 |
| Idris Contract Flooring Limited | Wholesale & retail | 2006 |
| Idris Education Limited | Information & communication | 2017 |
| Ifton Garage Services Limited | Wholesale & retail | 2011 |
| Ifton Holdings Limited | Financial services | 2020 |
| Iglew Vending Limited | Wholesale & retail | 2014 |
| Igreen Energy Limited | Construction | 2012 |
| Iheat Ltd | Construction | 2014 |
| Illumina Electrotechnical Engineering Ltd | Construction | 2024 |
| Imgaw Limited | Arts & recreation | 2021 |
| IN HIS Steps Coaching Ltd | Education | 2025 |
| IN2 Access & Control Limited | Wholesale & retail | 2009 |
| Indigo Hudson Consulting Limited | Professional & scientific | 2026 |
| Induna Ltd | Wholesale & retail | 2025 |
| Inkcognito Printing Ltd | Manufacturing | 2026 |
| Innolift UK Limited | Wholesale & retail | 2013 |
| Innovate and Sustain Ltd | Construction | 2025 |
| Inspectionex Ltd | Construction | 2019 |
| Instant Green Direct Ltd | Extraterritorial | 2017 |
| Interport BD Limited | Transport & logistics | 2013 |
| Invisitek Ltd | Extraterritorial | 2008 |
| IPS Coaching Limited | Professional & scientific | 2014 |
| IQ Electrical & Mechanical Ltd | Construction | 2023 |
| IRA Properties Limited | Real estate | 2021 |
| Irax Ltd | Information & communication | 1999 |
| Ironcrumb Consultancy Ltd | Professional & scientific | 2020 |
| Irvine Gardens Management Company Limited | Real estate | 2015 |
| Isaacs Accountancy & Advisory Ltd | Professional & scientific | 2023 |
| Isabel Lankester Limited | Professional & scientific | 2023 |
| Isjrc Limited | Health & social care | 2019 |
| Isoplan International Limited | Administrative & support | 1999 |
| Istanbul Haircut Oswestry Ltd | Other services | 2025 |
| Itrex Web Services Ltd | Information & communication | 2013 |
| IVO Auto Repair Ltd | Wholesale & retail | 2026 |
| J & H Renewables LLP | | 2026 |
| J & I Carpets Limited | Wholesale & retail | 2004 |
| J K Smith Limited | Other services | 2024 |
| J M Jones & Sons Ltd | Construction | 2012 |
| J S Cowling Limited | Wholesale & retail | 2003 |
| J S Electrical & Air Conditioning Limited | Construction | 2025 |
| J W Jones Electrical Limited | Construction | 2021 |
| J&C Day Property Rentals Ltd | Real estate | 2025 |
| J&S Collective UK Ltd | Wholesale & retail | 2025 |
| J&V Bell Limited | Administrative & support | 2008 |
| J.H.S.M. Limited | Professional & scientific | 2007 |
| J.N. Wigley Limited | Agriculture & fishing | 2014 |
| J.P. Arthur & Sons Limited | Wholesale & retail | 1939 |
| J.R. Pickstock Limited | Construction | 1990 |
| J55 Consult Limited | Professional & scientific | 2013 |
| JA & OW Holding Co Limited | Financial services | 2020 |
| Jackdaw Management Limited | Real estate | 2008 |
| Jackson Agri Engineering Ltd | Agriculture & fishing | 2012 |
| Jackson Agricultural Services Ltd | Professional & scientific | 2026 |
| James Dougan Ltd | Information & communication | 2024 |
| James Pickstock (Holdings) Limited | Financial services | 2019 |
| James Pickstock Limited | Wholesale & retail | 1975 |
| JAS Movers & Services Ltd | Transport & logistics | 2024 |
| JAX Heating & Cooling Ltd | Construction | 2023 |
| Jaxcats Limited | Hospitality | 2021 |
| JC and at Arms Limited | Hospitality | 2025 |
| JC72 Services Limited | Arts & recreation | 2025 |