| Hmaw Residential Group Ltd | Real estate | 2025 |
| Holland Medical Services Limited | Health & social care | 2020 |
| Holska Limited | Professional & scientific | 2023 |
| Holt and Kennedy Properties Limited | Real estate | 2002 |
| Homeland (Northwest) Limited | Real estate | 2000 |
| Honest Property Group Ltd | Real estate | 2024 |
| Hope Place Investments Ltd | Real estate | 2002 |
| Hops and Barley (Group) Limited | Extraterritorial | 2014 |
| Hops and Barley (UK) Limited | Extraterritorial | 2014 |
| Hops and Barley Limited | Wholesale & retail | 1991 |
| Hopscotch (Restaurant & Bar) Limited | Hospitality | 1998 |
| Hornport Construction Limited | Construction | 1981 |
| House of Elegance (ST Helens) Limited | Other services | 2007 |
| HUG Limited | Arts & recreation | 1998 |
| HUG Management Ltd | Real estate | 2024 |
| Hughes Energy Consultancy Limited | Professional & scientific | 2003 |
| Hughes Maher & Co. Limited | Wholesale & retail | 1983 |
| Hunter Roofline Services Limited | Construction | 2006 |
| Hurlington Associates Limited | Professional & scientific | 2007 |
| Huskisson Limited | Wholesale & retail | 1979 |
| Hydrate Global Limited | Manufacturing | 2025 |
| Hyperion Ventures | Real estate | 2019 |
| I.C.S. Regeneration Group Ltd | Real estate | 2000 |
| I.D.I Electrics Ltd | Construction | 2008 |
| IAB Services Limited | Manufacturing | 2007 |
| IAN Doddridge Electrical & Audio Ltd | Construction | 2002 |
| Ibreathe Community CIC | Health & social care | 2025 |
| ID1 Media Ltd | Information & communication | 2006 |
| Iffa INS Lpool Ltd | Financial services | 2024 |
| Immersive Mobile Cinema Ltd | Information & communication | 2025 |
| Inasu Trading Limited | Real estate | 2019 |
| Independence Initiative Limited | Health & social care | 1998 |
| Infomears Consultancy Limited | Information & communication | 2000 |
| INM & DB Properties Ltd | Real estate | 2006 |
| INM Properties Ltd | Real estate | 1984 |
| Innovation and Technology Services Limited | Wholesale & retail | 2002 |
| Input Solutions Limited | Information & communication | 1999 |
| Intocad Ltd | Professional & scientific | 2005 |
| Isight Cumbria Limited | Professional & scientific | 2002 |
| Isight Limited | Health & social care | 1999 |
| Isothermal Technology Limited | Manufacturing | 1980 |
| Issa Medical Limited | Health & social care | 2024 |
| J Caldwell Medical Services Limited | Health & social care | 2014 |
| J. Corrinaldi Limited | Manufacturing | 2005 |
| J. L. Edwards & Sons Limited | Agriculture & fishing | 2003 |
| J. R. Greenall Limited | Agriculture & fishing | 2003 |
| J. Smyth Welding Limited | Manufacturing | 2007 |
| J.A. Jones & Sons (Churchtown) Limited | Agriculture & fishing | 1983 |
| J.A.D. Healthcare Limited | Health & social care | 2006 |
| J.F.Foord Limited | Wholesale & retail | 1956 |
| J.Milman & Sons Limited | Real estate | 1952 |
| J.W.Ball(Southport)Limited | Other services | 1947 |
| Jacaranda Enterprises Limited | Hospitality | 1994 |
| Jackamy Limited | Wholesale & retail | 2002 |
| James Baxendale & Sons Limited | Professional & scientific | 1991 |
| James Whiffen Joinery Limited | Construction | 2003 |
| James Wright Cars Limited | Wholesale & retail | 2005 |
| JAY - JAY Associates Limited | Professional & scientific | 2007 |
| Jemel Limited | Health & social care | 2025 |
| Jenetic Limited | Financial services | 2024 |
| JG Consultancy (Wirral) Limited | Administrative & support | 2002 |
| Jiang Jiying Technology Co., Ltd | Extraterritorial | 2021 |
| JJS Hygienic Wall Systems Ltd | Construction | 2000 |
| JMT Expansion Ltd | Real estate | 2021 |
| JOE Ainsworth Limited | Information & communication | 2007 |
| JOE Burton and Sons Limited | Construction | 2005 |
| John Antrobus & SON Limited | Administrative & support | 2006 |
| John Brown Estate Agents Limited | Real estate | 2006 |
| John Cothliff Limited | Construction | 1933 |
| John Mcdowell Removals & Storage Limited | Administrative & support | 2006 |
| John Mighall and Company Limited | Transport & logistics | 1982 |
| John Millington Building Services Limited | Construction | 2006 |
| John Percival Marine Associates Limited | Extraterritorial | 2006 |
| John Teire & Co Limited | Manufacturing | 1977 |
| Johnson & SON Roofing Ltd | Construction | 2004 |
| Johnson & Wood Veterinary Practice Limited | Professional & scientific | 2007 |
| Joinspace Property Management Limited | Households | 1989 |
| JOL Consulting Limited | Professional & scientific | 2005 |
| JSS Medical Services Limited | Real estate | 2010 |
| JSS SPV Limited | Real estate | 2022 |
| JTK Properties Limited | Real estate | 2012 |
| Julie Louise Aesthetics Ltd | Other services | 2017 |
| JW Classical Joinery Limited | Construction | 2004 |
| K M (Property Management) Limited | Real estate | 2001 |
| K. W. Hailwood and Company Limited | Wholesale & retail | 1979 |
| K2 Aluminium Systems Limited | Manufacturing | 2003 |
| K2SW Properties Ltd | Real estate | 2000 |
| Kalyan Medical Services Limited | Health & social care | 2014 |
| Kannman Consulting Limited | Information & communication | 2007 |
| Kanusa Ltd | Wholesale & retail | 2004 |
| Kattikka Indian Ltd | Hospitality | 2024 |
| Kay's Opticians Limited | Wholesale & retail | 1976 |
| Kean Lanyon Limited | Administrative & support | 2003 |
| Keegan Watch Ltd | Manufacturing | 2025 |
| Kevin Simpson IFA Limited | Financial services | 2006 |
| Keyventure Limited | Professional & scientific | 1999 |
| Kick Audio Visual Limited | Information & communication | 1999 |
| Kinetic Resources Limited | Professional & scientific | 2006 |
| Kingfisher Lake Developments Limited | Real estate | 2006 |
| Kirk Craig Limited | Manufacturing | 2002 |