| James Macintyre & Co. Ltd. | Wholesale & retail | 2025 |
| James PYE & SON Ltd | Households | 2016 |
| James Wilding Joinery Limited | Manufacturing | 2024 |
| Jamm Property Ltd | Real estate | 2024 |
| Jamsharp Ltd | Financial services | 2023 |
| Jane Gilchrist Coaching Limited | Professional & scientific | 2021 |
| Jane Pighills Agriculture Limited | Agriculture & fishing | 2021 |
| Jarrison Heating & Plumbing Ltd | Construction | 2025 |
| Jaycee Estates LLP | | 2023 |
| Jaycee Group Limited | Financial services | 2023 |
| Jayplas Limited | Manufacturing | 2007 |
| JBA Bentley Limited | Construction | 2013 |
| JBA Consulting Limited | Extraterritorial | 2018 |
| JBA Global Resilience Limited | Professional & scientific | 2024 |
| JBA Group Employee Ownership Trustee Limited | Professional & scientific | 2014 |
| JBA Group Limited | Professional & scientific | 2007 |
| JBA Risk Management Limited | Professional & scientific | 2011 |
| JBA Trust Limited | Professional & scientific | 2011 |
| JBL Gill and SON Ltd. | Transport & logistics | 2010 |
| JC Developments Skipton Ltd | Construction | 2024 |
| JC Roofing Skipton Ltd | Construction | 2024 |
| JC Services and Supplies Limited | Real estate | 2025 |
| JCB Building Services Ltd | Professional & scientific | 2010 |
| Jcco 133 Limited | Arts & recreation | 2001 |
| JD Mounsey Ltd | Construction | 2006 |
| JD Tandems LLP | | 2010 |
| Jdaa Property Development Ltd | Households | 2025 |
| Jelly and Ice Cream (Private Clients) Ltd | Other services | 2012 |
| Jelly and Ice Cream Limited | Other services | 2009 |
| JEM Engineering Ltd | Professional & scientific | 2021 |
| Jenna Meeking Photography Ltd | Professional & scientific | 2018 |
| Jenng Management Limited | Real estate | 2018 |
| Jeremy Benn Associates Limited | Professional & scientific | 1996 |
| Jetcarrier Ltd | Transport & logistics | 2025 |
| Jetjaks Ltd | Real estate | 2026 |
| JIM Thwaite Builders Limited | Construction | 2011 |
| JIM Varney Photography Ltd | Professional & scientific | 2007 |
| Jjxg Properties Ltd | Real estate | 2024 |
| JLB Training Limited | Other services | 2024 |
| JLM Ltd | Administrative & support | 2004 |
| JM Sports Ltd | Arts & recreation | 2022 |
| JMF34 Limited | Education | 2018 |
| JMG Hair Limited | Other services | 2018 |
| Jnac Industrial & Residential Properties Limited | Construction | 2016 |
| Jnac Property Limited | Real estate | 2021 |
| JNK Parys Limited | Professional & scientific | 2016 |
| JOE Hawkins Films Ltd | Information & communication | 2025 |
| JOF Construction Limited | Manufacturing | 2026 |
| JOH Business Transformation Limited | Professional & scientific | 2015 |
| John Binns Springs a CGR Company Limited | Manufacturing | 1967 |
| John Bollen Limited | Manufacturing | 2003 |
| John Bray Construction Services Ltd | Construction | 2015 |
| John Chapman Conservation Ltd | Agriculture & fishing | 2025 |
| John Chapman Gardens Limited | Administrative & support | 2016 |
| John Chapman Landscape Design and Construction Limited | Administrative & support | 2004 |
| John Chapman Landscapes Ltd | Agriculture & fishing | 2025 |
| John Dawson & SON (Holdings) Limited | Financial services | 2021 |
| John Dawson & SON Limited | Construction | 2006 |
| John Dawson & SON Property Ltd | Real estate | 2025 |
| John Exley Optician Limited | Wholesale & retail | 2007 |
| John Lampkin Imports Limited | Wholesale & retail | 2002 |
| John Lampkin Properties Limited | Financial services | 2017 |
| John Lund (Gisburn) Limited | Manufacturing | 1962 |
| John Mason Printers Limited | Manufacturing | 2022 |
| John Watson Electrical Services Limited | Construction | 2019 |
| John Winder Limited | Construction | 2003 |
| Jokaf Avenir Training and Management Consult Limited | Real estate | 2025 |
| Jones and Rice Limited | Professional & scientific | 2017 |
| Jonjo Ceilings, Partitions and Plasterboarding Ltd | Construction | 2025 |
| Jorr Properties Limited | Construction | 2019 |
| JP Properties Skipton Limited | Households | 2018 |
| JPW Skipton Holdings Limited | Financial services | 2014 |
| JRA Limited | Real estate | 2024 |
| Jrbpropertyrenovations Ltd | Real estate | 2025 |
| Jrco Ltd | Professional & scientific | 2020 |
| JSA & EA Crabtree & SON Livestock Ltd | Agriculture & fishing | 2023 |
| Jswm Ltd | Real estate | 2024 |
| JTS Electrical Limited | Construction | 2025 |
| Judler Ltd | Professional & scientific | 2013 |
| Julien Ltd | Wholesale & retail | 2022 |
| Just ASK Care and Support CIC | Health & social care | 2013 |
| JW80 Limited | Professional & scientific | 2024 |
| Jyothi Property Management Ltd | Real estate | 2022 |
| Jyothi Software Solutions Limited | Information & communication | 2019 |
| K a W Consulting & Mediation Ltd | Administrative & support | 2019 |
| K C Autocentre Limited | Wholesale & retail | 2008 |
| K HOD Construction Limited | Construction | 2022 |
| K M Creative Solutions Ltd | Professional & scientific | 2012 |
| K Peacock Ltd | Transport & logistics | 2019 |
| K V Deliveries Limited | Transport & logistics | 2021 |
| K&Z Contractors Ltd | Construction | 2023 |
| Kadeh Ltd | Hospitality | 2023 |
| Kapow Thai Ltd | Hospitality | 2023 |
| Kaptech Hose Limited | Wholesale & retail | 1983 |
| Kareema Limited | Administrative & support | 2004 |
| Karm Yorkshire Dales Limited | Manufacturing | 2024 |
| Kasper Interiors Limited | Manufacturing | 2023 |
| KD Global Capital Investments Ltd | Real estate | 2023 |
| KDL Pollensa Ltd | Real estate | 2001 |
| Keeping Children Safe | Other services | 2010 |