| JAR Post Production Ltd | Extraterritorial | 2018 |
| Jarrod's Wood Finishes Limited | Manufacturing | 2023 |
| JAS (Cheadle) Ltd | Hospitality | 2010 |
| Jaunter Limited | Construction | 1988 |
| Javelin Consulting Ltd | Real estate | 1999 |
| Javid Medical Services Limited | Health & social care | 2009 |
| Jaybee Commerce Ltd | Manufacturing | 2023 |
| Jaymax Limited | Professional & scientific | 2009 |
| JB Property Services (Cheadle) Ltd | Construction | 2013 |
| JB Ultrasound Limited | Health & social care | 2022 |
| JBD Optics Ltd | Wholesale & retail | 2023 |
| Jblb Properties Limited | Real estate | 2018 |
| JC Courier's and Sons Limited | Transport & logistics | 2019 |
| JCB Compact Products Limited | Manufacturing | 1986 |
| JCR Talent Limited | Administrative & support | 2022 |
| JD Events Cheshire Limited | Administrative & support | 2026 |
| JD Health Recruitment Ltd | Administrative & support | 2022 |
| JD Locum Ltd | Wholesale & retail | 2022 |
| JD Properties M/Cr Ltd | Real estate | 2018 |
| JD Safety Services Ltd | Administrative & support | 2023 |
| JDC Electrical Ltd | Construction | 2004 |
| JED Clothing Ltd | Wholesale & retail | 2022 |
| Jehan Suppliers Ltd | Wholesale & retail | 2023 |
| Jelbco Ltd | Arts & recreation | 2026 |
| Jenaderm Limited | Health & social care | 2021 |
| Jerjees Corporation Limited | Real estate | 2019 |
| Jerrold Finco PLC | Financial services | 2003 |
| Jerrold Trust Corporation Limited | Administrative & support | 2019 |
| Jerusha Care Limited | Health & social care | 2020 |
| Jessow Ltd | Wholesale & retail | 2020 |
| Jeter Property Limited | Real estate | 2014 |
| Jf&L Co Ltd | Arts & recreation | 2025 |
| JFC Cleaning Solutions Ltd | Administrative & support | 2023 |
| JFW Investments Limited | Real estate | 2011 |
| JFW Properties Ltd | Real estate | 2012 |
| JGJ Property Management Ltd | Real estate | 2026 |
| JGJ UK Holdings Limited | Financial services | 2026 |
| Jiazhi Jewelry Ltd | Wholesale & retail | 2024 |
| Jieba Ltd | Health & social care | 2020 |
| Jigsaw Abodes Ltd | Real estate | 2021 |
| Jigsaw Financial Estate Planning Ltd | Financial services | 2020 |
| Jigsaw Financial Ltd | Financial services | 2019 |
| Jigsaw Lets Ltd | Real estate | 2021 |
| Jilly Julian Ltd | Professional & scientific | 2022 |
| Jiroll Ltd | Professional & scientific | 2018 |
| JJ Bespoke Build Ltd | Construction | 2026 |
| JJ Local Store Ltd | Wholesale & retail | 2024 |
| JJ Sports Coaching Ltd. | Other services | 2017 |
| Jksolutionsai Ltd | Information & communication | 2025 |
| JKW Group Holdings Limited | Financial services | 2023 |
| JKW Property Ltd | Real estate | 2017 |
| JL Footwear Limited | Wholesale & retail | 2024 |
| JLC Property Group Ltd | Real estate | 2018 |
| JLC Property Limited | Real estate | 2016 |
| JLC Ventures Limited | Real estate | 2016 |
| JLD Contracts Ltd | Construction | 2025 |
| JLW Financial Management Ltd | Financial services | 2024 |
| JM Design and Construction Ltd | Construction | 2023 |
| JM Research Limited | Administrative & support | 2003 |
| JMH International Ltd | Professional & scientific | 2019 |
| JMM Build Ltd | Construction | 2023 |
| JMO Surveyors Ltd | Professional & scientific | 2015 |
| Jmpgc Ltd | Professional & scientific | 2022 |
| JMR Consultancy Services Ltd | Professional & scientific | 2016 |
| JNB UK Express Ltd | Transport & logistics | 2026 |
| JO Shippen Ltd | Hospitality | 2022 |
| Joan Crozier (Properties) Limited | Real estate | 2003 |
| Jobe Consulting Limited | Professional & scientific | 2017 |
| Joeys Elmsway Company Ltd | Wholesale & retail | 2025 |
| Johans Consulting Limited | Professional & scientific | 2023 |
| John Hunt Photography Limited | Professional & scientific | 2002 |
| John Malone Limited | Construction | 2017 |
| John Niven Interior Design Limited | Professional & scientific | 2017 |
| John Trade and Consultancy Ltd | Wholesale & retail | 2019 |
| Jolly Carter (NW) Limited | Hospitality | 2014 |
| JOM Gatley Limited | Wholesale & retail | 2011 |
| Jomuna Curry House Ltd | Hospitality | 2025 |
| Jonathan Alcock & Sons Limited | Other services | 1949 |
| Jonathan Alcock Enterprises Limited | Construction | 2020 |
| Jonathan Dale Ltd | Financial services | 2022 |
| Jonera Properties Limited | Real estate | 2023 |
| JONES14 Limited | Real estate | 2019 |
| Joni & ME Ltd | Wholesale & retail | 2025 |
| Jordan Lynch Limited | Financial services | 2005 |
| Josh Mchale Holdings Limited | Financial services | 2026 |
| Josh Mchale Investments Limited | Administrative & support | 2026 |
| Joud Medical Limited | Health & social care | 2023 |
| Joule Share Limited | Professional & scientific | 2024 |
| JP Security Risk Management Ltd | Administrative & support | 2026 |
| JPB Project Management Ltd | Professional & scientific | 2025 |
| JPD Installations Limited | Construction | 2013 |
| JPS Walker Solicitors Ltd | Professional & scientific | 2016 |
| JRM Carpentry & Joinery Ltd | Construction | 2023 |
| JRT Corporation Limited | Wholesale & retail | 2015 |
| JRV Holdings Limited | Financial services | 2019 |
| JS Consulting Limited | Information & communication | 2025 |
| JSB Pharma Ltd | Wholesale & retail | 2024 |
| JSG Mechanical Limited | Construction | 2025 |
| JSJ Electrical Installation Ltd | Construction | 2023 |
| Jske Ltd | Real estate | 2023 |