| Indian Spice ST14 Ltd | Hospitality | 2019 |
| Industry Live Agency Limited | Other services | 2018 |
| Industry Music Group Limited | Other services | 2009 |
| Indybeecreative Ltd | Professional & scientific | 2024 |
| INNOVATE2EDUCATE Partnership Limited | Education | 2017 |
| Instore Furniture Ltd | Wholesale & retail | 2019 |
| Integrated Thinking Solutions Limited | Information & communication | 2025 |
| Interactive Rail Solutions Ltd | Construction | 2018 |
| Interconsult Limited | Professional & scientific | 1987 |
| International Construction Design Limited | Construction | 2017 |
| International Referees Organisation Ltd | Arts & recreation | 2025 |
| Ironmongery NOW Limited | Extraterritorial | 2020 |
| Iskra Ltd | Wholesale & retail | 2007 |
| IVY House Accommodation Ltd. | Construction | 2018 |
| J C B Attachments Ltd. | Professional & scientific | 2005 |
| J C Bamford Lifeplan LLP | | 2025 |
| J C Bamford Lifeplan Pension Company Limited | Financial services | 2025 |
| J P Hainsworth Haulage (Ashbourne) Limited | Transport & logistics | 2007 |
| J W K (Driver Services) Limited | Transport & logistics | 2009 |
| J&J Magness Property Ltd | Real estate | 2019 |
| J. C. Parker Electrical Services Limited | Other services | 2003 |
| J. S. Gardner Limited | Other services | 2016 |
| J.C. Bamford Excavators Limited | Manufacturing | 1956 |
| J.C.B.Research | Manufacturing | 1961 |
| J.W. Pearce Holdings Limited | Financial services | 2021 |
| J.W.C.I. Limited | Construction | 2001 |
| JAC Air Conditioning & Electrical Services Limited | Construction | 2012 |
| Jacks Lane Marchington Management Company Ltd | Households | 2019 |
| Jacks Nice Hair CUT Market Place Ltd | Other services | 2022 |
| Jackson Consultancy Ltd | Professional & scientific | 2025 |
| Jaelee Real Estate Limited | Real estate | 2021 |
| James Bradley John Properties Ltd | Real estate | 2026 |
| Jasben Solutions Ltd | Information & communication | 2025 |
| JB Home Properties Ltd | Households | 2024 |
| JBT Global Limited | Wholesale & retail | 2020 |
| JCB Access Limited | Manufacturing | 2000 |
| JCB Backhoe Loaders Ltd | Manufacturing | 1997 |
| JCB Connected Technologies Limited | Information & communication | 2019 |
| JCB Consumer Products Limited | Wholesale & retail | 2007 |
| JCB Credit Ltd | Manufacturing | 1986 |
| JCB Defence Products Limited | Manufacturing | 2006 |
| JCB Dump Trucks Ltd. | Professional & scientific | 1988 |
| JCB Finance Holdings Limited | Financial services | 2008 |
| JCB Finance International Limited | Professional & scientific | 1980 |
| JCB Finance Management Services Limited | Financial services | 2008 |
| JCB Financial Solutions UK Limited | Financial services | 2008 |
| JCB Garage Limited | Wholesale & retail | 2023 |
| JCB Golf and Country Club Limited | Arts & recreation | 2014 |
| JCB Green Hydrogen Limited | Manufacturing | 2020 |
| JCB Hydrapower | Professional & scientific | 2023 |
| JCB Hydrogen Energy Limited | Manufacturing | 2020 |
| JCB Hydrogen Limited | Manufacturing | 2020 |
| JCB Hydropower | Professional & scientific | 2023 |
| JCB Limited | Financial services | 2023 |
| JCB Military Limited | Public administration | 2026 |
| JCB North America Limited | Manufacturing | 2010 |
| JCB Parts Ltd | Professional & scientific | 1997 |
| JCB Power Products Broadcrown Limited | Manufacturing | 2015 |
| JCB Power Products Limited | Manufacturing | 2006 |
| JCB Power Systems Limited | Manufacturing | 2003 |
| JCB Special Products Limited | Professional & scientific | 1986 |
| JE & IG Services Limited | Administrative & support | 2014 |
| JGL Professional Services Ltd | Professional & scientific | 2024 |
| JIM Sharp Associates Limited | Professional & scientific | 2021 |
| JJB Shops Limited | Wholesale & retail | 2020 |
| JJP Plumbing and Heating Limited | Construction | 2024 |
| JM Property Holdings (Mercia) Limited | Administrative & support | 2023 |
| JMG Wealth Planning Ltd | Financial services | 2024 |
| JMI Planning Limited | Professional & scientific | 2016 |
| Jmji Holdings Limited | Financial services | 2023 |
| John German Estate Agents Limited | Real estate | 2013 |
| John German Holdings Limited | Real estate | 2013 |
| John Magness Limited | Professional & scientific | 2015 |
| John Sewell Garages Limited | Wholesale & retail | 2003 |
| John Walker Solutions Limited | Hospitality | 2001 |
| JON Sword Ltd | Manufacturing | 2018 |
| Joprop Limited | Real estate | 2025 |
| Journeyman (Staffordshire) Limited | Transport & logistics | 2000 |
| Journeys a LA Carte Limited | Administrative & support | 1994 |
| JP Estates Uttoxeter Ltd | Real estate | 2023 |
| JP NPI Engineering Consulting Ltd | Extraterritorial | 2021 |
| JRE Consultants Limited | Professional & scientific | 2017 |
| JRP Services Ltd | Construction | 2026 |
| JS Quality Meats Limited | Wholesale & retail | 2004 |
| JSM (Jonah's School of Motoring) Ltd | Education | 2012 |
| JTL Fleet Services Ltd | Wholesale & retail | 2025 |
| JU57LYD Holdings Ltd | Real estate | 2026 |
| Julie Gray Limited | Professional & scientific | 2018 |
| Jupiter Global Holdings Limited | Financial services | 2022 |
| Just HR Ltd | Administrative & support | 2025 |
| JW Hire Limited | Administrative & support | 2025 |
| Jwci Holdings Limited | Financial services | 2025 |
| JWW Homes Limited | Real estate | 2020 |
| K & M Elkin Farms Limited | Agriculture & fishing | 2005 |
| K & R Leisure Limited | Arts & recreation | 2026 |
| K I and E L Matkin Limited | Agriculture & fishing | 2014 |
| KAB Construct and Develop Limited | Construction | 2017 |
| Kamraitong Limited | Hospitality | 2025 |
| Karl Fisher Autos Limited | Wholesale & retail | 2004 |
| KAS Engineering Ltd | Manufacturing | 2026 |