| JP Morris Limited | Agriculture & fishing | 2012 |
| JP Vacuum Coolers (Holdings) Limited | Manufacturing | 2025 |
| JP Vacuum Coolers Limited | Manufacturing | 2009 |
| JP York Ltd | Construction | 2021 |
| Jp&Co. Ltd | Real estate | 2026 |
| JPB Composites Ltd | Manufacturing | 2016 |
| JPB Steel Limited | Professional & scientific | 2026 |
| Jpbutler Consulting Limited | Information & communication | 2015 |
| JPD Advisory Ltd | Professional & scientific | 2026 |
| JPG Enterprises Limited | Financial services | 2012 |
| Jphyo Ltd | Health & social care | 2025 |
| JPM York Limited | Professional & scientific | 2005 |
| JPS Media Ltd | Information & communication | 2014 |
| Jps.Law Limited | Professional & scientific | 2018 |
| Jpvw Limited | Construction | 2016 |
| JR Midgley & Sons LLP | | 2025 |
| JR Property Maintenance (York) Limited | Construction | 2025 |
| JRA Family Restaurants Limited | Hospitality | 2013 |
| JRA Services Ltd | Information & communication | 2003 |
| JRB Limited | Construction | 2021 |
| JRC Automotive Solutions Ltd | Manufacturing | 2025 |
| JRJ Printing Ltd | Manufacturing | 2026 |
| JRK Properties Limited | Real estate | 2005 |
| JRL Media Group Limited | Professional & scientific | 2021 |
| Jrla Services Ltd | Professional & scientific | 2020 |
| JRM Road Marking Ltd | Construction | 2020 |
| JRP York Limited | Real estate | 1925 |
| JRR Ltd | Hospitality | 2023 |
| Jrrt (Investments) Limited | Extraterritorial | 1976 |
| Jrrt (Properties) Limited | Real estate | 1977 |
| JRT Farms Ltd | Real estate | 2019 |
| Jrtss Limited | Information & communication | 2019 |
| JRW Brunton Limited | Information & communication | 2025 |
| JS and G Mining Engineering Consultancy Ltd | Professional & scientific | 2021 |
| JS Dent Limited | Health & social care | 2024 |
| JS Kitchen Ltd | Construction | 2026 |
| JS Power Services Limited | Construction | 2016 |
| JSA Design & Development Limited | Professional & scientific | 2025 |
| JSA Developments Ltd | Households | 2016 |
| JSA Yorkshire Ltd | Construction | 2023 |
| JSM Catering Ltd | Hospitality | 2011 |
| JSM Properties Yorkshire Limited | Real estate | 2024 |
| Jsmb Properties Limited | Construction | 2017 |
| JSP Sustainability Limited | Construction | 2012 |
| JSR Services Ltd | Information & communication | 2024 |
| JST Wealth Advisory Limited | Financial services | 2025 |
| Jstead Properties Ltd. | Real estate | 2026 |
| JSW Projects Limited | Construction | 2014 |
| JT Construction Management Ltd | Administrative & support | 2017 |
| JT Wentworth Ltd | Transport & logistics | 2015 |
| Jubbergate Holdings Limited | Real estate | 2018 |
| Jubbergate Ltd | Hospitality | 2018 |
| Jubilee Gardens (Warminster) Management Company Ltd | Households | 2022 |
| Jubilee Rise (Shepshed) Management Company Limited | Real estate | 2023 |
| Judge Electrical Limited | Construction | 2007 |
| Judge Technical Services Limited | Administrative & support | 2017 |
| JUE EN Limited | Real estate | 2020 |
| Julee Limited | Real estate | 2017 |
| Julie Butler Limited | Professional & scientific | 2003 |
| Julie Dodsworth Design Limited | Arts & recreation | 2014 |
| Julie Dodsworth LLP | | 2011 |
| Julie's Home Help Ltd | Health & social care | 2021 |
| Julies Commercial Cleaning Services Ltd | Administrative & support | 2024 |
| Jumah and Kishtaini Ltd | Real estate | 2016 |
| Jump in Performance Ltd | Other services | 2021 |
| June Emerson Wind Music Limited | Wholesale & retail | 2026 |
| Juniper House Investments Ltd | Real estate | 2019 |
| Juniper House Stays Limited | Hospitality | 2024 |
| Jupiter Blue Ltd | Wholesale & retail | 2007 |
| Juridis Legal Expertise Ltd | Administrative & support | 2024 |
| Just 1 Source and Supply Limited | Wholesale & retail | 2008 |
| Just Beds Limited | Manufacturing | 1988 |
| Just Brochures Ltd | Professional & scientific | 2021 |
| Just Cleaning Solution Ltd | Administrative & support | 2023 |
| Just Gardens (York) Limited | Administrative & support | 2025 |
| Just Paper Bags Limited | Wholesale & retail | 2019 |
| Just Play Padel Ltd | Administrative & support | 2016 |
| Just Riding Along Ltd | Manufacturing | 2018 |
| Just Simply Investments Limited | Real estate | 2020 |
| Just UK Estates Limited | Real estate | 2017 |
| Just UK Estates Planning Limited | Real estate | 2015 |
| Justin Barnes Consultancy Limited | Information & communication | 2007 |
| Justin Palmer Joinery and Building Limited | Manufacturing | 2026 |
| Justin's Caricatures Ltd | Arts & recreation | 2021 |
| Justine Andrew Ltd | Professional & scientific | 2025 |
| Juvion Ltd | Wholesale & retail | 2025 |
| JV Living Holdings Limited | Financial services | 2025 |
| JVB Solutions (York) Ltd | Real estate | 2021 |
| Jvincent Developments Ltd | Construction | 2021 |
| JVM Web Consulting Ltd | Information & communication | 2012 |
| JVO Property Ltd | Real estate | 2022 |
| JVW Contract Consulting Ltd | Professional & scientific | 2026 |
| JW Auctions Limited | Real estate | 2020 |
| JW Lean Bites Limited | Wholesale & retail | 2026 |
| JW PUB Film Ltd | Information & communication | 2024 |
| JW Stevenson Ltd | Real estate | 2021 |
| JWS York Ltd | Administrative & support | 2025 |
| Jwtc Limited | Arts & recreation | 2019 |
| JXR Property Limited | Real estate | 2021 |
| JY UK Holdings Ltd | Financial services | 2022 |