| JOP POW Limited | Professional & scientific | 2013 |
| JOR Decorators Ltd | Construction | 2021 |
| Jordan & Somerfield Joinery Ltd | Construction | 2021 |
| Jordans Solicitors (Yorkshire) Limited | Professional & scientific | 2019 |
| Josal Ltd | Real estate | 2025 |
| Joseph Rhodes Limited | Extraterritorial | 2022 |
| Joseph's Investment Ltd | Hospitality | 2023 |
| Josephine&Me Limited | Professional & scientific | 2020 |
| Josh Lindsay Delivery Ltd | Transport & logistics | 2026 |
| Jota Global Limited | Professional & scientific | 2015 |
| Joule Facilities Ltd | Construction | 2025 |
| Journey Lounge Limited | Hospitality | 2025 |
| Joyce Jones Limited | Administrative & support | 2016 |
| Joys Investments Limited | Financial services | 2026 |
| Joys Self Drive Limited | Administrative & support | 2026 |
| Joys Transport Limited | Transport & logistics | 2021 |
| JP Land Restoration Services Limited | Water & waste | 2017 |
| JPB Facilities Management Limited | Administrative & support | 2011 |
| Jpbuymyhomefast Ltd | Real estate | 2024 |
| Jplove Homes Limited | Real estate | 2024 |
| JPS Construction Group Ltd | Construction | 2026 |
| JPT Roofing Ltd | Construction | 2017 |
| JRA Geoconsulting Ltd | Professional & scientific | 2023 |
| JRD Law Limited | Extraterritorial | 2008 |
| JRH Properties and Maintenance Limited | Real estate | 2024 |
| JRJ York Apartments Ltd | Real estate | 2021 |
| Jrsb Electrical Limited | Extraterritorial | 2020 |
| JRW Build Limited | Construction | 2024 |
| JS Curtains and Blinds Ltd | Manufacturing | 2012 |
| JS Deco Ltd | Manufacturing | 2020 |
| JS Electrical & Property Services Ltd | Construction | 2026 |
| JS Fire Safety Limited | Financial services | 2023 |
| JSH Goods Limited | Extraterritorial | 2022 |
| JSH UK Trading Ltd | Wholesale & retail | 2009 |
| JSK Rothwell Ltd | Hospitality | 2026 |
| JSM Car Sales Ltd | Wholesale & retail | 2023 |
| JSM Solar Limited | Construction | 2023 |
| Jspence Properties Limited | Households | 2025 |
| JSS Property Solutions Limited | Real estate | 2024 |
| JST Works Limited | Professional & scientific | 2017 |
| JT JT Nails Limited | Other services | 2025 |
| Jtales Ltd | Hospitality | 2025 |
| Jtcc Property Limited | Real estate | 2020 |
| JTM Retail Ltd | Wholesale & retail | 2024 |
| Jtwr Properties Ltd | Real estate | 2009 |
| Jubco Limited | Wholesale & retail | 2018 |
| Judgepal Singh Limited | Transport & logistics | 2025 |
| Juice Logistics Limited | Extraterritorial | 2005 |
| Juice Personnel Limited | Administrative & support | 2002 |
| Jule Services (West Yorkshire) Limited | Manufacturing | 2010 |
| Julia Weldon Executive Leadership Ltd | Professional & scientific | 2025 |
| Julie Fletcher Interpreter Limited | Professional & scientific | 2013 |
| Julius Joseph Limited | Health & social care | 2021 |
| Jumbo Motorcycle Breakers Limited | Administrative & support | 2003 |
| Jumpdrop Limited | Professional & scientific | 2010 |
| Junction 28 Storage Ltd | Transport & logistics | 2016 |
| Junglebox Ltd | Arts & recreation | 2023 |
| Junior Bambinos Ltd | Wholesale & retail | 2019 |
| Juniper Software Solutions Ltd | Information & communication | 2023 |
| Junk INS Limited | Hospitality | 2011 |
| Juntech Ltd | Manufacturing | 2016 |
| Jupiter Programme Services Limited | Information & communication | 2016 |
| Jurni Taxis Ltd | Transport & logistics | 2022 |
| Just Fascias Limited | Other services | 1998 |
| Just for Your Occasion Limited | Administrative & support | 2025 |
| Just Homes (Care) Limited | Health & social care | 2008 |
| Just Homes (Investments) Limited | Real estate | 2013 |
| Just Perfect Homes Ltd | Construction | 2020 |
| Just Perfect Properties Ltd | Construction | 2023 |
| Just Sarnies Ltd | Hospitality | 2005 |
| Just Smile With Style Limited | Health & social care | 2014 |
| JUSTROLLING6S Ltd | Wholesale & retail | 2025 |
| Juventrade Ltd | Wholesale & retail | 2023 |
| Juwara Limited | Transport & logistics | 2023 |
| JW & M Holdings Limited | Hospitality | 2025 |
| JW PMC Ltd | Professional & scientific | 2019 |
| JW Worktops Ltd | Manufacturing | 2019 |
| JWP Legal Limited | Professional & scientific | 2011 |
| Jynx Trades Ltd | Wholesale & retail | 2026 |
| K & V Design Limited | Construction | 2024 |
| K J Yorkshire Ltd | Other services | 2025 |
| K Mead Haulage Limited | Transport & logistics | 2013 |
| K Mead Properties Limited | Real estate | 2020 |
| K P Investments (Yorkshire) Limited | Financial services | 2018 |
| K P Medicare Limited | Health & social care | 2013 |
| K P Properties (Yorkshire) Limited | Real estate | 2014 |
| K Petty & Company Limited | Transport & logistics | 2009 |
| K Pizza & Balti House Ltd | Hospitality | 2020 |
| K R Construction (WR) Limited | Construction | 2010 |
| K S W Engineering (Yorkshire) Ltd | Manufacturing | 2011 |
| K Tank Consulting Ltd | Financial services | 2012 |
| K V Building & Furniture Designs Limited | Manufacturing | 2012 |
| K Weld Sales Ltd | Construction | 2019 |
| K&G Bathrooms Ltd | Construction | 2021 |
| K&J Builders (Yorkshire) Limited | Real estate | 2020 |
| K&Q Parlour Ltd | Other services | 2022 |
| K1 Consultancy Ltd | Professional & scientific | 2025 |
| K9 College Limited | Administrative & support | 2021 |
| K9 Elite Great Britain Limited | Administrative & support | 2019 |
| KA & Sons Solutions Limited | Real estate | 2021 |