| HG Portfolio Ltd | Wholesale & retail | 2018 |
| Hicharms (UK) Ltd. | Manufacturing | 2005 |
| High Society Limited | Wholesale & retail | 1986 |
| High Standard Limited | Manufacturing | 1995 |
| Highwood North West Limited | Wholesale & retail | 2001 |
| Hilary Homes Limited | Real estate | 2003 |
| Hill's Fine Foods Limited | Wholesale & retail | 2006 |
| Hill's Panel Products Limited | Manufacturing | 1990 |
| Hilson Filtration Products Ltd | Manufacturing | 2007 |
| Hilson UK Holdings Limited | Financial services | 2016 |
| Hilton Rubin Investments Limited | Real estate | 1935 |
| Hindle & Jepson Financial Services Ltd | Administrative & support | 2005 |
| Hinton Lawler Ltd | Wholesale & retail | 2025 |
| Hirsch & Co. Ltd. | Financial services | 1990 |
| HMG Consulting Ltd | Professional & scientific | 2022 |
| HNL Associates Limited | Financial services | 2002 |
| Hocus Pocus Day Nursery Limited | Education | 2002 |
| Hodgson & Hardman Limited | Health & social care | 2000 |
| Hogasol Design by Innovation Ltd | Professional & scientific | 2007 |
| Holdex (Plywood) Limited | Manufacturing | 1966 |
| Holgates Holdings Limited | Professional & scientific | 2007 |
| Hollins Lane Forton Management Company Limited | Households | 2019 |
| Hollyacres Cat Hotel Ltd | Other services | 2004 |
| Hollybeach ASH Ltd | Wholesale & retail | 2025 |
| Home Bakery (Fleetwood) Ltd | Wholesale & retail | 2002 |
| Home by Project 34 Ltd | Other services | 2024 |
| Home Centre Limited | Real estate | 2006 |
| Home Interiors 24 Ltd | Wholesale & retail | 2023 |
| Home Proud (Burnley) Limited | | 1982 |
| Homeless Action | Health & social care | 1997 |
| Homeplan Design Ltd | Professional & scientific | 2005 |
| Homestyle (WTC) Ltd | Manufacturing | 2003 |
| Homeworthy Furniture Limited | Professional & scientific | 1959 |
| Honeycomb Company Limited | Wholesale & retail | 1971 |
| Honeywell Estate Agents Limited | Real estate | 2004 |
| Horizon Software Solutions Limited | Information & communication | 2006 |
| Horological Solvents Limited | Manufacturing | 1949 |
| Hosted Eco Ltd | Administrative & support | 2022 |
| Hothersalls Agricultural Services Limited | Administrative & support | 2002 |
| Hotrod Gazette Limited | Wholesale & retail | 2004 |
| Houghton Vehicle Repairs Ltd | Wholesale & retail | 2018 |
| House Martins Care Limited | Health & social care | 2003 |
| Houston Homes NW Limited | Households | 2026 |
| Howards Tarleton Limited | Administrative & support | 2007 |
| Howarth & Reed Electrical and Solar Ltd | Construction | 2019 |
| Howorths Textiles Limited | Manufacturing | 2006 |
| HPP Property Developments Limited | Real estate | 2014 |
| Hsec Limited | Extraterritorial | 1996 |
| Hsella Consulting Ltd | Information & communication | 2006 |
| Hudson Communications Limited | Information & communication | 1997 |
| Hugh Mason Properties Limited | Real estate | 1978 |
| Humberston Limited | Professional & scientific | 1998 |
| Humphreys Pallets Limited | Manufacturing | 2003 |
| Huntroyde Nurseries Limited | Wholesale & retail | 1993 |
| Hurstdene Residents Association Limited | Households | 2001 |
| Hurstwell Developments Ltd | Financial services | 2000 |
| Hussain Money Transfer UK Limited | Financial services | 2006 |
| Hutchins IT Limited | Information & communication | 2017 |
| Hy-Fly Game Hatcheries Limited | Agriculture & fishing | 2000 |
| Hybro Limited | Construction | 2001 |
| Hydraulic Power Services Limited | Manufacturing | 2001 |
| Hyndburn Press Limited | Manufacturing | 1984 |
| I S P (Training) Ltd | Professional & scientific | 2007 |
| I-Learn Limited | Professional & scientific | 1998 |
| I. M. Brown Limited | Administrative & support | 2000 |
| I. T. Management Solutions Limited | Information & communication | 2000 |
| I.C. Liftek Limited | Manufacturing | 2005 |
| I.S.M. Construction Limited | Construction | 2000 |
| IAN Austin Plastering Limited | Construction | 2003 |
| IAN Barnes Limited | Financial services | 2002 |
| IAN James Window Cleaning Limited | Administrative & support | 2003 |
| Icecap Cooling Limited | Construction | 1996 |
| Iceway Limited | | 1984 |
| IDC Construction Limited | Construction | 2007 |
| Ideal Plumbing Timber & Building Supplies Limited | Wholesale & retail | 1999 |
| Identity U.K. Limited | Transport & logistics | 2002 |
| Ifsec Northern Limited | | 1983 |
| Igloofish Limited | Information & communication | 2005 |
| Ihalo INT. Limited | Information & communication | 2007 |
| Image House (Stafford) Management Limited | Households | 2023 |
| IMD Design Services Limited | Professional & scientific | 2003 |
| Impressions Sign Services Limited | Administrative & support | 2002 |
| Impwood Limited | Construction | 1988 |
| Incopo Consulting Limited | Professional & scientific | 2012 |
| Independent Catering Services (UK) Limited | Administrative & support | 2006 |
| Independent Kitchen Components Limited | Wholesale & retail | 2002 |
| Independent Turfkare Solutions Limited | Wholesale & retail | 2004 |
| Inertial Sounds Limited | Wholesale & retail | 2023 |
| ING Design (NW) Limited | Professional & scientific | 2025 |
| Ingledene Property Group Ltd | Financial services | 1996 |
| Inhoco 3381 Limited | Financial services | 2007 |
| Inktech Limited | Manufacturing | 1995 |
| Inman Sefton Ltd | Wholesale & retail | 2025 |
| Innervale Limited | Construction | 2003 |
| Inox Ltd | Wholesale & retail | 2021 |
| Instex Limited | Wholesale & retail | 2002 |
| Insurance Data Solutions Ltd | Information & communication | 2006 |
| Integration Solutions Limited | Administrative & support | 2004 |
| Interfreight (North West) Limited | Information & communication | 1990 |
| International Sport Limited | Extraterritorial | 1991 |