| Hockley Developments (SLC) Limited | Construction | 2023 |
| Hockley Developments Residential Limited | Construction | 2024 |
| Holdwood Limited | Professional & scientific | 2016 |
| Holy Ghost Mines Limited | Mining & quarrying | 2024 |
| Holy Ghost Mining Limited | Mining & quarrying | 2025 |
| Home Additions (Cumbria) Ltd | Construction | 2025 |
| Home Energy Reduction Community Interest Company | Professional & scientific | 2025 |
| Homesphere Property Management Services Limited | Households | 2020 |
| Horizon Consultancies Ltd | Public administration | 2013 |
| Horizon Studios (North West) Community Interest Company | Health & social care | 2021 |
| Horrocks (North West) Limited | Construction | 2013 |
| Horrocks and Cross Limited | Real estate | 1987 |
| Horton Landscapes Limited | Administrative & support | 2018 |
| Horton Leisure Management Ltd | Hospitality | 2017 |
| Hotwire Graphics Limited | Manufacturing | 2014 |
| House 2 Home Property Ltd | Real estate | 2023 |
| House of Anderson (1905) Limited | Construction | 2014 |
| House of Anderson Limited | Construction | 2018 |
| House of Arina Ltd | Other services | 2025 |
| HOW Handyman Ltd | Construction | 2026 |
| HRX Holdings Limited | Financial services | 2024 |
| Hsdavey Ltd | Manufacturing | 2026 |
| HSP Milners Limited | Manufacturing | 2013 |
| Hughes Commissioning Services Limited | Professional & scientific | 2015 |
| Hughes Marine Engineering Limited | Administrative & support | 2012 |
| Hughes SUB Surface Engineering Limited | Administrative & support | 2006 |
| Hummingbird Sports Bars Limited | Hospitality | 2024 |
| Hunt's Electrical Services Ltd | Manufacturing | 2025 |
| Hunt's Scaffolding Ltd | Construction | 2018 |
| Hyland Barrow Health Center Ltd | Health & social care | 2021 |
| Hyson Group Limited | Professional & scientific | 2018 |
| Iain Walker Bathroom and Tiling Limited | Other services | 2022 |
| IAN Frazer Financial Planning Limited | Financial services | 2011 |
| Ibev Lets Ltd | Real estate | 2014 |
| IC Learning Mentor Limited | Education | 2018 |
| Iconic Subsea Limited | Professional & scientific | 2023 |
| Icontrol Systems Limited | Information & communication | 2002 |
| ICW Pipework Ltd | Construction | 2017 |
| Identityco Limited | Wholesale & retail | 2001 |
| Impact With Integrity Ltd | Professional & scientific | 2018 |
| Impleo Limited | Administrative & support | 2012 |
| Impra Wood Protection Limited | Manufacturing | 2000 |
| IN the Detail (NW) Ltd | Wholesale & retail | 2023 |
| Indobites Ltd | Hospitality | 2022 |
| Industry 13 Limited | Arts & recreation | 2015 |
| Industry Domains and Media Ltd | Professional & scientific | 2025 |
| Industry Kitchen Limited | Hospitality | 2020 |
| Infrawell Ltd | Administrative & support | 2025 |
| Infurness C.I.C. | Professional & scientific | 2019 |
| Iniphi Ltd. | Professional & scientific | 2025 |
| Inlaw Properties Ltd | Real estate | 2022 |
| Inmet Insulations Limited | Professional & scientific | 2004 |
| Inspec Engineering Limited | Professional & scientific | 1998 |
| Inspiria Search Limited | Administrative & support | 2019 |
| Intelligent Web Solutions Limited | Professional & scientific | 2009 |
| Irmak Renas Ltd | Hospitality | 2025 |
| Iron Property Solutions Ltd | Real estate | 2025 |
| Island Laundry Limited | Hospitality | 2020 |
| Island Stitches Ltd | Wholesale & retail | 2026 |
| Istambul Hair Cut(Lake District) Ltd | Other services | 2019 |
| Isuk Ltd | Information & communication | 2019 |
| ITS Corporation London Limited | Extraterritorial | 2015 |
| IVY Rose Health & Beauty Ltd | Other services | 2018 |
| Izgara Barrow Ltd | Hospitality | 2018 |
| J D Wilkins Ltd | Information & communication | 2011 |
| J K Moorby Limited | Manufacturing | 2015 |
| J Marshall GAS Services Ltd | Construction | 2013 |
| J T Vehicles South Lakes Ltd | Wholesale & retail | 2018 |
| J.W.Hall&Co Blinds Ltd | Wholesale & retail | 2014 |
| JA Offshore Limited | Energy | 2017 |
| Jack Stoker Cars Limited | Wholesale & retail | 2023 |
| Jack Woodward Properties Limited | Real estate | 2025 |
| Jackie at Eastwood Limited | Professional & scientific | 2017 |
| Jackman Homes Ltd | Households | 2017 |
| Jacob Ralph Ltd | Real estate | 2025 |
| Jacs Engineering Services Limited | Professional & scientific | 2020 |
| JAF Offshore Consultancy Ltd | Professional & scientific | 2021 |
| Jaggar Heating Ltd | Construction | 2016 |
| JAM Gardening Services Ltd | Administrative & support | 2023 |
| James Fisher (Aberdeen) Limited | Professional & scientific | 2005 |
| James Fisher (Crewing Services) Limited | Administrative & support | 2002 |
| James Fisher (Shipping Services) Limited | Transport & logistics | 1941 |
| James Fisher and Sons Public Limited Company | Transport & logistics | 1926 |
| James Fisher Asset Information Services Limited | Administrative & support | 2008 |
| James Fisher Defence Limited | Manufacturing | 2009 |
| James Fisher Everard Limited | Transport & logistics | 1956 |
| James Fisher Holdings Limited | Financial services | 2023 |
| James Fisher Holdings UK Limited | Professional & scientific | 2015 |
| James Fisher Marine Services Limited | Information & communication | 2004 |
| James Fisher MFE Limited | Extraterritorial | 2014 |
| James Fisher Properties Two Limited | Professional & scientific | 2000 |
| James Fisher Rumic Limited | Extraterritorial | 1984 |
| James Fisher Subtech Group Limited | Professional & scientific | 2015 |
| James Fisher Tankships Holdings Limited | Transport & logistics | 1972 |
| Jaro Subsea Services Limited | Administrative & support | 2017 |
| Jay-Dee Ltd | Information & communication | 2020 |
| Jaykay Designs Ltd | Professional & scientific | 2012 |
| JB Cleaning Services Cumbria Limited | Administrative & support | 2023 |
| JBF Lettings Limited | Real estate | 2023 |
| JBW Renewables Ltd | Professional & scientific | 2026 |