| Homes@@Cozy Limited | Wholesale & retail | 2024 |
| Horseshoe Hub Restaurant Limited | Hospitality | 2013 |
| Horseshoe Propco Limited | Real estate | 2023 |
| House of Social Axis Limited | Construction | 2024 |
| House of Social One Foodhall Opco Limited | Hospitality | 2025 |
| House of Social One Holdco Limited | Financial services | 2024 |
| House of Social One Limited | Construction | 2022 |
| House of Social One Management Limited | Real estate | 2024 |
| House of Social One Midco Limited | Financial services | 2024 |
| House of Social One Opco Limited | Real estate | 2024 |
| House of Social Rooke 1 Limited | Financial services | 2022 |
| House of Social Rooke 2 Limited | Real estate | 2022 |
| House of Social Rooke Holdco Limited | Financial services | 2022 |
| Hurricane Ventures Ltd | Information & communication | 2022 |
| HUW Davis Limited | Administrative & support | 2011 |
| I Heart the Poplars Ltd | Information & communication | 2017 |
| Ikhaya Design Consultancy Ltd | Construction | 2018 |
| Incubeaut Ltd | Professional & scientific | 2026 |
| Individual Ltd | Other services | 2017 |
| Ingrid Hallam Skin Expert Limited | Other services | 2020 |
| Innsaei Counselling Ltd | Health & social care | 2019 |
| Inshare Insurance Services Limited | Financial services | 2020 |
| Inshare Limited | Information & communication | 2019 |
| Inshare Management Services Ltd | Professional & scientific | 2026 |
| Inspire Innovations Ltd | Other services | 2023 |
| Integrated Office Machines (UK) Limited | Wholesale & retail | 2022 |
| Intelligent Impact Group Ltd | Wholesale & retail | 2025 |
| INV Recruitment Ltd | Administrative & support | 2020 |
| Investment Properties (North West) Limited | Construction | 2016 |
| Invitations & Co Ltd | Manufacturing | 2013 |
| IP Crime Publishing Limited | Information & communication | 2026 |
| Irmac Roads Limited | Manufacturing | 2011 |
| Ironfield Industrial Limited | Construction | 2026 |
| Italic Ltd | Information & communication | 2018 |
| Itran Travel Ltd | Administrative & support | 2024 |
| IVC Investments Limited | Real estate | 2019 |
| IVC Residential Property Ltd | Real estate | 2021 |
| J.B.G. (Property) Limited | Construction | 1973 |
| Jameson Investments Limited | Professional & scientific | 2001 |
| Janda Design LLP | | 2016 |
| Jason Daviestransport Limited | Transport & logistics | 2008 |
| JD Horizons Limited | Professional & scientific | 2015 |
| JD Vistas Limited | Professional & scientific | 2014 |
| Jegreen Property Ltd | Real estate | 2026 |
| Jenny Heyes Ltd | Construction | 2025 |
| Jesse Smith (Builders) Limited | Construction | 1938 |
| JET Brands Ltd | Wholesale & retail | 2020 |
| JMW Ecommerce Limited | Wholesale & retail | 2009 |
| Johan Properties Ltd | Households | 2025 |
| John P. Mitchell (Estates) Limited | Construction | 1975 |
| Jonathan Sharp Limited | Professional & scientific | 2017 |
| Jones Homes (Fylde) Limited | Professional & scientific | 1993 |
| Jones Homes (Lancashire) Limited | Construction | 1976 |
| Jones Homes (North West) Limited | Construction | 1959 |
| Jones Homes (Northern) Limited | Construction | 2015 |
| Jones Homes (Portugal) Limited | Professional & scientific | 1995 |
| Jones Homes (Southern) Limited | Construction | 1995 |
| Jones Homes (Yorkshire) Limited | Construction | 1996 |
| Jones Homes Group Limited | Professional & scientific | 1978 |
| Jones Partnership Homes Limited | Professional & scientific | 2010 |
| Jones Residential (Leasing) Limited | Real estate | 1995 |
| Jones Retirement Homes Limited | Professional & scientific | 1988 |
| Jordan Peake Ltd | Administrative & support | 2017 |
| Joyful Capital Ltd | Financial services | 2025 |
| JPS Assets Ltd | Financial services | 2011 |
| JPS FLY Fish Ltd | Wholesale & retail | 2022 |
| JPS SPV Limited | Construction | 2025 |
| JSE Property Group Holdings Limited | Construction | 2024 |
| JSE Property Group SPV1 Limited | Construction | 2024 |
| JSE Property Group SPV2 Limited | Construction | 2024 |
| Jules Hardman Pilates Limited | Other services | 2013 |
| Just Plonk Limited | Wholesale & retail | 2021 |
| JY Capital Ltd | Real estate | 2026 |
| JY Property Group Ltd | Real estate | 2024 |
| JY Therapy Ltd | Public administration | 2026 |
| K&Mw Properties Ltd | Real estate | 2020 |
| Kandi Tree Limited | Administrative & support | 2017 |
| Kimble Roden Architects Ltd | Professional & scientific | 2010 |
| Kings Close Developments Limited | Professional & scientific | 1988 |
| Kingsway Investments (Properties) Limited | Professional & scientific | 1997 |
| Kirkham's (Contractors) Limited | Construction | 1966 |
| Kokans Ltd | Health & social care | 2011 |
| Kyngstone Limited | Real estate | 2012 |
| Kyrochem Holdings Limited | Wholesale & retail | 2024 |
| L O'Rourke Management Ltd | Extraterritorial | 2013 |
| L&R Cafe Alderley Edge Ltd | Hospitality | 2023 |
| L.A.M. Ventures Ltd | Hospitality | 2024 |
| Labuntina Limited | Other services | 2013 |
| Land Reclamation and Development Limited | Professional & scientific | 1999 |
| Landology Group Ltd | Real estate | 2021 |
| Landology Ltd | Real estate | 2021 |
| Lane Legal Support Ltd | Administrative & support | 2014 |
| Langley Road Developments Limited | Construction | 2024 |
| Lash HQ Ltd | Other services | 2019 |
| Last Drop Hotel Limited | Hospitality | 2014 |
| Latch Tickets Limited | Information & communication | 2026 |
| Launch Aviation Limited | Education | 2022 |
| Laurence Place Holdco Limited | Real estate | 2017 |
| Leisure Websites Limited | Information & communication | 2002 |
| LET US Clean Ltd | Administrative & support | 2016 |