| Inter City Couriers Limited | Transport & logistics | 2009 |
| Interevents Management Ltd | Professional & scientific | 2015 |
| Interior FX Limited | Other services | 2018 |
| Interis Limited | Information & communication | 2007 |
| Intermed Consultancy Ltd | Professional & scientific | 2018 |
| Inver-Itchen Consulting Ltd | Professional & scientific | 2018 |
| Ipersonal Physiotherapy Ltd | Health & social care | 2019 |
| Irinutza Limited | Other services | 2016 |
| Ironstyles (UK) Limited | Manufacturing | 2008 |
| ISL Associates Limited | Administrative & support | 2011 |
| Istanbul Barber Hinckley Ltd | Other services | 2024 |
| Istanbul Orient Ltd | Wholesale & retail | 2017 |
| Iszeneo Limited | Information & communication | 2024 |
| IT Roadway Ltd | Information & communication | 2020 |
| ITC International Trading Ltd | Wholesale & retail | 2019 |
| Itechnologyrepairs Ltd | Other services | 2023 |
| It’S SO Fudgin’ Good! Ltd | Manufacturing | 2026 |
| IVY LEA Homes Limited | Hospitality | 2025 |
| J & a Payment Solutions Ltd | Administrative & support | 2025 |
| J & F Powner Limited | Water & waste | 2006 |
| J C Beardmore Limited | Other services | 2004 |
| J C Plumbing & Heating Midlands Ltd | Construction | 2016 |
| J J Musson (Holdings) Limited | Financial services | 2024 |
| J J Musson Limited | Agriculture & fishing | 2024 |
| J Ladkin Construction Services Limited | Professional & scientific | 2019 |
| J M Properties Hinckley Limited | Real estate | 2019 |
| J R a Bennett Limited | Wholesale & retail | 1995 |
| J R Gale Limited | Professional & scientific | 2008 |
| J S Fleet Ltd | Wholesale & retail | 2025 |
| J Wren Electrical Ltd | Construction | 2016 |
| J&C Jasmine Ltd | Health & social care | 2025 |
| J. a. & F. Edwards Limited | Real estate | 1965 |
| J. N. Jewellery (Goldsmiths) Limited | Other services | 2003 |
| J.C.R Groundwork’S and Civils Ltd | Construction | 2026 |
| J.N Repairs Ltd | Wholesale & retail | 2025 |
| J.Rex Properties Ltd | Real estate | 2024 |
| J.S.Guest Ltd | Transport & logistics | 2025 |
| Jabberjacks Franchising Limited | Administrative & support | 2001 |
| JAC B&D Property Ltd. | Real estate | 2015 |
| JAC Stats Limited | Professional & scientific | 2003 |
| Jack Joynson Software Limited | Information & communication | 2020 |
| Jacks Fish and Chips Ltd | Hospitality | 2024 |
| Jacob Service Ltd | Transport & logistics | 2015 |
| Jahsa Ltd | Professional & scientific | 2025 |
| James Bennett (Holdings) Limited | Professional & scientific | 1994 |
| James Bennett (Properties) Limited | Real estate | 1994 |
| James Bennett,Limited | Manufacturing | 1915 |
| James Clowes Limited | Agriculture & fishing | 2005 |
| James Fleming Architectural Ltd | Professional & scientific | 2021 |
| James Ross I.S. Limited | Financial services | 2007 |
| Jantom Ltd | Transport & logistics | 2015 |
| Jayco Group Ltd | Financial services | 2024 |
| Jaylee Enterprises Ltd | Wholesale & retail | 2023 |
| JB Affiliates Limited | Professional & scientific | 2017 |
| JBW Trading Ltd | Wholesale & retail | 2023 |
| JC Civils and Limited | Construction | 2025 |
| Jcas Limited | Professional & scientific | 2007 |
| JCW 365 Ltd | Extraterritorial | 2021 |
| Jdmarm Limited | Manufacturing | 2026 |
| Jeden Limited | Wholesale & retail | 1972 |
| Jeff Holdings Limited | Real estate | 2006 |
| Jesur Ltd | Construction | 2018 |
| Jets (Hinckley) Limited | Other services | 2006 |
| JG Trim Ltd | Professional & scientific | 2021 |
| JH Group Holdings Limited | Financial services | 2022 |
| Jintex Limited | Wholesale & retail | 2014 |
| JJ Quality Car Sales Ltd | Wholesale & retail | 2024 |
| JJ Seed Construction Ltd | Construction | 2021 |
| Jjtc Consulting Limited | Professional & scientific | 2010 |
| JK Dens Limited | Hospitality | 2016 |
| JKB Construction Limited | Construction | 2024 |
| JKM Swimschool Warwickshire Ltd | Education | 2024 |
| JLB Media Group Limited | Professional & scientific | 2023 |
| JM Properties & Investments Ltd | Real estate | 2017 |
| JML Build Limited | Extraterritorial | 2019 |
| JML Contractors Ltd | Construction | 2012 |
| JML Cooling and Refrigeration Limited | Extraterritorial | 2019 |
| JML Green Energy Limited | Energy | 2020 |
| JML Group Holdings Limited | Real estate | 2019 |
| JML Mechanical Limited | Extraterritorial | 2019 |
| JML Ventilation Limited | Extraterritorial | 2019 |
| JMW Planning Solutions Limited | Administrative & support | 2010 |
| JOE Klenk Limited | Hospitality | 2011 |
| Joelle Luxury Ltd | Wholesale & retail | 2025 |
| John Brindley Commercials Limited | Transport & logistics | 1931 |
| John Brindley Group Limited | Financial services | 2018 |
| JON Clarke Garages Limited | Manufacturing | 2012 |
| JON Forrester IT Consultancy Limited | Information & communication | 2007 |
| Jonathan Allinson Ltd | Health & social care | 2013 |
| Jones Bistro Limited | Hospitality | 2023 |
| Jones Prestige and Performance Limited | Extraterritorial | 2016 |
| JRB Technical Services Ltd | Manufacturing | 2025 |
| JRM Transport Services Ltd | Transport & logistics | 2023 |
| Jubilee Farm Developments Limited | Construction | 2015 |
| Jubilee Property Investment Limited | Real estate | 2017 |
| Jude Read-Hr Consultancy Ltd | Administrative & support | 2018 |
| Julian Designs Limited | Other services | 2001 |
| Jumbo Inflatables Limited | Manufacturing | 2011 |
| Jungle Room Ltd | Education | 2026 |
| Just Classics Limited | Wholesale & retail | 2005 |