| JMH Consulting Services Ltd | Professional & scientific | 2025 |
| JMP Architects Limited | Professional & scientific | 2004 |
| JMR Concrete Services Limited | Manufacturing | 2024 |
| JN & DF Hoyles & Sons Limited | Administrative & support | 2017 |
| JN Hair Studio Ltd | Other services | 2025 |
| Jo&Elsie Ltd | Wholesale & retail | 2020 |
| Joash Arun Ltd | Real estate | 2022 |
| JOB4DENISS Ltd | Construction | 2024 |
| Jobfair Software Ltd | Wholesale & retail | 2024 |
| JOE Greenland & SON Limited | Construction | 2024 |
| JOE Lettington Ltd | Education | 2025 |
| JOE Mather Photography Ltd | Professional & scientific | 2026 |
| JOE Punshon Structural Investigation Jpsi Ltd | Professional & scientific | 2021 |
| John Askew Limited | Construction | 2001 |
| John Morgan and Co Limited | Water & waste | 2010 |
| John P Kummer Limited | Other services | 1989 |
| John Wareing ( Plant Fitter) Limited | Manufacturing | 2003 |
| Johnston & White Ltd | Hospitality | 2023 |
| Joiryda Engineering Limited | Extraterritorial | 2007 |
| JON Brook Photography Ltd | Other services | 2011 |
| Jonathan ELF Data & Information Services Ltd | Information & communication | 2020 |
| Jonathan International Ltd | Transport & logistics | 2022 |
| Joonrui Capital Ltd | Financial services | 2023 |
| JOP Ridding Farm Ltd | Other services | 2025 |
| Jordan Contracting Limited | Construction | 2021 |
| Joseph a Jones & Co LLP | | 2015 |
| Joseph Storey Ltd | Financial services | 2011 |
| Joshvic Fishing Company Ltd | Agriculture & fishing | 2019 |
| Joyce Builders NW Limited | Construction | 2008 |
| Joyfansion Trade Limited | Wholesale & retail | 2024 |
| JP & LP Estates Ltd | Real estate | 2026 |
| JP Electrical Services Ltd | Construction | 2020 |
| JPK Semiconductor Ltd | Other services | 2020 |
| JPK2020 Limited | Professional & scientific | 2020 |
| JPW Projects Ltd | Administrative & support | 2025 |
| JS Communications Limited | Information & communication | 2016 |
| JSB Professional Services Limited | Professional & scientific | 2026 |
| JSD Consulting Associates Ltd | Construction | 2012 |
| Jselec Limited | Construction | 2024 |
| JST Property Lettings Ltd. | Real estate | 2024 |
| JT Parks Limited | Hospitality | 2026 |
| JTS Capital Ventures Limited | Financial services | 2023 |
| JTS Farming Limited | Agriculture & fishing | 2016 |
| Jubilee Garage Holdings Limited | Financial services | 2021 |
| Jubilee Sales Limited | Wholesale & retail | 2016 |
| Jubilee Workshop Limited | Wholesale & retail | 2017 |
| Junction 33 Limited | Wholesale & retail | 2026 |
| Junk Inc Limited | Wholesale & retail | 2025 |
| Just a Bite (Lancaster) Limited | Hospitality | 2024 |
| Just Hair (Lancaster) Limited | Other services | 2016 |
| Just Kitchens (Lancaster) Ltd | Wholesale & retail | 2013 |
| Just Scale AI Ltd | Information & communication | 2025 |
| Just Sell Padel Ltd | Wholesale & retail | 2026 |
| Justizia Ltd | Professional & scientific | 2018 |
| JVB25 Ltd | Financial services | 2026 |
| JVS College Limited | Arts & recreation | 2024 |
| JW Companies Group Limited | Construction | 2020 |
| JW Quality Ltd | Wholesale & retail | 2025 |
| JWF Harry Consultancy Ltd | Professional & scientific | 2018 |
| Jwpc Ltd | Professional & scientific | 2002 |
| JZS Construction Maintenance Ltd | Construction | 2018 |
| K B Electrical (North West) Limited | Construction | 2015 |
| K F Oriental Limited | Wholesale & retail | 2013 |
| K Harrison Architects Limited | Professional & scientific | 2020 |
| K Mills Consultancy Group Ltd | Professional & scientific | 2017 |
| K&J Park Homes Ltd | Hospitality | 2023 |
| K.L.S. Motors Limited | Wholesale & retail | 2000 |
| KA Squared Limited | Real estate | 2018 |
| Kaarina Canine Services Limited | Extraterritorial | 2011 |
| Kaat Investments Limited | Administrative & support | 2024 |
| Kaat Properties NW Limited | Extraterritorial | 2015 |
| Kaco Property Limited | Real estate | 2024 |
| Kadampa Meditation Centre Lancaster | Other services | 2004 |
| Kadifoo Ltd | Information & communication | 2014 |
| Kaizen Academy Limited | Arts & recreation | 2015 |
| Kaizen Smart Data Limited | Information & communication | 2020 |
| Kakkar Medical Limited | Health & social care | 2019 |
| KAM Drainage Limited | Construction | 2023 |
| Kampung Limited | Information & communication | 2021 |
| KAN Bars Ltd | Hospitality | 2023 |
| KAN Food (NW) Ltd | Hospitality | 2023 |
| KAN Promotions Ltd | Hospitality | 2023 |
| Kankan Consults Ltd | Professional & scientific | 2021 |
| Karen Maybury Creative Connections Limited | Arts & recreation | 2014 |
| Kaso SOW Limited | Arts & recreation | 2024 |
| Kate Whyborn Performing Arts Limited | Arts & recreation | 2025 |
| Katharine Pedersen Limited | Professional & scientific | 2010 |
| Katie Philpott School of Dance Limited | Arts & recreation | 2023 |
| Kay's Hair Studio Ltd | Other services | 2025 |
| Kazyaz Limited | Information & communication | 2025 |
| KBD Dance Limited | Arts & recreation | 2025 |
| Kbda Limited | Arts & recreation | 2026 |
| Kbhgv Limited | Transport & logistics | 2020 |
| KC Hospitality Ltd | Hospitality | 2022 |
| KC Mgmt Ltd | Arts & recreation | 2025 |
| KD Decor Ltd | Construction | 2022 |
| KDG Educational Services Ltd | Education | 2026 |
| KDH Property Services Limited | Real estate | 2006 |
| Keane 2 Clean Ltd | Administrative & support | 2023 |
| Keenan Able Development Ltd | Real estate | 2025 |