| J&J Electrical Partners Ltd | Construction | 2024 |
| J&J Property Solutions Ltd | Real estate | 2022 |
| J&M Deli Supplies Ltd | Wholesale & retail | 2016 |
| J. W. Kirkham Farms Limited | Extraterritorial | 2013 |
| J.W. Kirkham & Sons (Eastham) Limited | Hospitality | 1963 |
| J.W.Kirkham & Sons | Agriculture & fishing | 1961 |
| Jackson & Co (Accountants) Ltd | Professional & scientific | 2012 |
| Jacksons EST Ltd | Real estate | 2025 |
| JAI Lounge Ltd | Hospitality | 2022 |
| Jakes & Co. Bespoke Tailoring Ltd | Wholesale & retail | 2019 |
| James Dentith Limited | Health & social care | 2022 |
| James Greig Design Ltd | Professional & scientific | 2020 |
| James Houseman Bespoke Interiors Limited | Construction | 2020 |
| Jams Berkeley Limited | Financial services | 2019 |
| Janus Studios Limited | Professional & scientific | 2024 |
| JAS Vitalnote Ltd | Professional & scientific | 2025 |
| Jasco 7 Limited | Real estate | 2022 |
| Jason Court Flat Management Company Limited | Households | 2000 |
| Jaspa Properties Ltd | Real estate | 2003 |
| JC Land and Property Ltd | Real estate | 2020 |
| Jckl RAD Ltd | Health & social care | 2018 |
| JCR Developments (UK) Ltd | Construction | 2006 |
| JD Stanbury Consultancy Ltd | Administrative & support | 2017 |
| JDB Alarms Ltd | Information & communication | 2022 |
| JDB Security Cctv Ltd | Administrative & support | 2017 |
| JDM Prime Finder Ltd | Wholesale & retail | 2025 |
| JFH Management Consultancy Limited | Professional & scientific | 2013 |
| JFS News Limited | Wholesale & retail | 2018 |
| JGL Estates Limited | Real estate | 1993 |
| JGL Operations Limited | Real estate | 2009 |
| JGL Relocation & Management Services Ltd. | Real estate | 1996 |
| JGL Sporting Links Ltd | Real estate | 2008 |
| JHC Flooring Ltd | Construction | 2025 |
| Jibai Ltd | Health & social care | 2012 |
| Jiggsaw Hair & Colour Limited | Other services | 2016 |
| JJ Parking Ltd | Other services | 2019 |
| JJ Site Services (Peterborough) Limited | Construction | 2012 |
| Jjbonn Limited | Professional & scientific | 2025 |
| JJH Solutions Limited | Information & communication | 2022 |
| Jk's Cafe and Grill Ltd | Hospitality | 2021 |
| JKM Digital Solutions Limited | Information & communication | 2017 |
| Jkwr Properties Ltd | Real estate | 2021 |
| JLS Enterprises Limited | Wholesale & retail | 2019 |
| JMH Marine Ltd | Transport & logistics | 2025 |
| JML Life Ltd | Financial services | 2022 |
| JMM Solutions Limited | Education | 2016 |
| JMW Properties Weymouth Limited | Real estate | 2021 |
| JNR Helicopter Services Ltd | Transport & logistics | 2025 |
| JO Conway Estates Ltd | Real estate | 2019 |
| Joanne Heath Ltd | Wholesale & retail | 2019 |
| JOB Flex Ltd | Administrative & support | 2022 |
| Jodarc Limited | Hospitality | 2014 |
| JOE Mallen Creative Ltd | Professional & scientific | 2014 |
| JOE Mallen Photography Limited | Professional & scientific | 2018 |
| Joeharry Limited | Professional & scientific | 2023 |
| Joel Firth Ltd | Professional & scientific | 2025 |
| Joework Ltd | Wholesale & retail | 2025 |
| John Carr Natural Stone Limited | Manufacturing | 2020 |
| John Ditchfield Glass Limited | Extraterritorial | 2003 |
| John Irving Ltd | Wholesale & retail | 2020 |
| John Leybourne & SON Electrical Contractors Limited | Construction | 2002 |
| John Nelson (Footwear Specialists) Limited | Wholesale & retail | 1980 |
| John Vause Limited | Professional & scientific | 2006 |
| Johnson's(Blackpool)Limited | Manufacturing | 1964 |
| Jomar Home Collections Ltd | Other services | 2015 |
| Joy Fortune Ltd | Hospitality | 2024 |
| JPA Surveyors & Valuers Limited | Professional & scientific | 2013 |
| JPF Consultancy Limited | Information & communication | 2017 |
| JPK Property Investments Ltd | Real estate | 2022 |
| Jprw Ltd | Professional & scientific | 2024 |
| JPS Properties North West Ltd | Real estate | 2020 |
| JPY Properties Ltd | Real estate | 2023 |
| JR Environment Limited | Professional & scientific | 2022 |
| Jrlw Holdings Ltd | Real estate | 2026 |
| JS Car Sales Ltd | Wholesale & retail | 2007 |
| Jsab Properties Ltd | Real estate | 2022 |
| JSL Projects Ltd | Manufacturing | 2022 |
| JSZ Care Ltd | Health & social care | 2016 |
| JSZ Investment Limited | Real estate | 2022 |
| JT Conveyancing Limited | Professional & scientific | 2022 |
| JTD Estates Limited | Wholesale & retail | 2008 |
| JTD TOO Limited | Real estate | 2020 |
| JTN Ingwe Ltd | Health & social care | 2011 |
| Juice Bar MCR Ltd | Hospitality | 2026 |
| Junglelook Limited | Professional & scientific | 2018 |
| Just Good Friends (North West) Limited | Health & social care | 2015 |
| Just Mot's (Blackpool) Ltd | Wholesale & retail | 2011 |
| Just Rentals Ltd | Real estate | 2019 |
| Justiceguides Limited | Public administration | 2020 |
| Justwipe Ltd. | Wholesale & retail | 2008 |
| Juta UK Ltd | Construction | 2008 |
| JVS Web Solutions Ltd | Information & communication | 2015 |
| K Hull Joinery Ltd | Construction | 2025 |
| K W Autos Limited | Wholesale & retail | 2004 |
| K. Merricks Ltd | Other services | 2003 |
| K.D Woods Joiners & Builders Limited | Construction | 2010 |
| KA Hull Joinery Limited | Construction | 2008 |
| Kaia Properties Limited | Real estate | 2022 |
| Kaizen Contractors Ltd | Construction | 2018 |
| Kaizen Life Ltd | Other services | 2023 |