| JMB (NW) Limited | Real estate | 2024 |
| JMC Financial Accountants Limited | Professional & scientific | 2016 |
| JMC Land & Property Limited | Real estate | 2023 |
| JMC PUB Management Limited | Hospitality | 2020 |
| Jmck Construction Ltd | Professional & scientific | 2008 |
| JML Civil Engineering Ltd | Construction | 2013 |
| JMR PUB Company Limited | Professional & scientific | 2018 |
| Jnrsen Limited | Arts & recreation | 2024 |
| JNT Heating Limited | Construction | 2018 |
| JO - Blessed Cleaning Services Ltd | Administrative & support | 2023 |
| Jo-An DA LEE Beauty Aids Limited | Wholesale & retail | 2004 |
| Joanne Clarke Letting Agents Limited | Real estate | 2019 |
| Joblessed Ltd | Wholesale & retail | 2018 |
| Jobley Ltd | Construction | 2019 |
| Jodocam | Professional & scientific | 2025 |
| JOE Burgess Ltd | Manufacturing | 2023 |
| Joe's Appliances Limited | Extraterritorial | 2021 |
| Joe's Barbers (Wigan) Limited | Other services | 2017 |
| Joel Properties (NW) Ltd | Real estate | 2025 |
| Joen Design Ltd | Wholesale & retail | 2025 |
| Joes Pizza Ltd | Wholesale & retail | 2014 |
| John & Sun International Ltd | Wholesale & retail | 2015 |
| John a Adams Ltd | Real estate | 2010 |
| John Atherton Autos Ltd | Wholesale & retail | 2002 |
| John Baker Mortgages Ltd | Professional & scientific | 2020 |
| John Cully Transport Limited | Transport & logistics | 2015 |
| John Fairhurst Trustees Limited | Extraterritorial | 1986 |
| John Halliwell Ltd | Construction | 2018 |
| John Ingram Enterprises Ltd | Real estate | 2020 |
| John Ingram Joinery Limited | Construction | 2007 |
| John Jolley Milkround Limited | Wholesale & retail | 2003 |
| John Kelsey Limited | Financial services | 1995 |
| John Mather Butchers Ltd | Wholesale & retail | 2020 |
| John Mather Sandwich Bar Ltd | Hospitality | 2020 |
| John Mcguire Building & Maintenance Limited | Construction | 2004 |
| John Mcguire Properties Limited | Real estate | 2025 |
| John Murphy Electrical (Standish) Limited | Construction | 2003 |
| Johnny & Sons Ltd | Water & waste | 2025 |
| Johnny Gelato Ltd | Manufacturing | 2025 |
| Johnson Packaging and Sons Limited | Wholesale & retail | 2012 |
| Johnsons Tinting Solutions Ltd | Manufacturing | 2024 |
| Jokam Property Ltd | Real estate | 2022 |
| Jolliffe Consultancy Limited | Professional & scientific | 2003 |
| Jollyflorist International Ltd | Wholesale & retail | 2021 |
| Jomilia Ltd | Professional & scientific | 2021 |
| JON Wright Electrical Ltd | Construction | 2008 |
| Jones Bros Group Ltd | Transport & logistics | 2023 |
| Jones Courier Services Limited | Transport & logistics | 2023 |
| Jones Site Services Limited | Construction | 2013 |
| Jones, Daughters and SON Limited | Real estate | 2021 |
| Jones, Rogers & Booth Limited | Professional & scientific | 2024 |
| Joola Systems Ltd | Manufacturing | 2025 |
| Joonmar Ltd | Professional & scientific | 2022 |
| Jora Apparel Ltd | Wholesale & retail | 2026 |
| Jordan Consulting Engineers Ltd | Professional & scientific | 2023 |
| Jordan Turner Leadership & Performance Ltd | Other services | 2023 |
| Jorden Insulation Ltd. | Manufacturing | 1996 |
| Jorgus Carpets Limited | Manufacturing | 2004 |
| Joseph Keegan & Sons Limited | Wholesale & retail | 1949 |
| Joseph Neil E-Commerce Group Limited | Information & communication | 2025 |
| Josh Charnley Limited | Arts & recreation | 2024 |
| Joss Properties Limited | Real estate | 2021 |
| Jostop Limited | Wholesale & retail | 2025 |
| Jotunheim Leathercraft Ltd | Manufacturing | 2025 |
| Joule Electrical Ltd | Construction | 2010 |
| Joy Heating Ltd | Construction | 2025 |
| Joy's Sparking Clean Ltd | Administrative & support | 2025 |
| Joyful Ventures Ltd | Health & social care | 2024 |
| JP Accountancy & Reporting Ltd | Professional & scientific | 2023 |
| JP Anime Ltd | Wholesale & retail | 2022 |
| JP Fire & Security NW Limited | Construction | 2026 |
| JP Home Solutions Ltd | Construction | 2024 |
| JP2 Consulting Ltd | Administrative & support | 2013 |
| JPB Global Engineering Limited | Professional & scientific | 2025 |
| JPB Heating Solutions Limited | Construction | 2024 |
| JPB Locums Limited | Health & social care | 2022 |
| JPG Electrical & Lighting Limited | Construction | 2023 |
| JPH Care Ltd | Health & social care | 2019 |
| JPJ Projects Ltd | Real estate | 2023 |
| Jpmorgan Consulting Limited | Professional & scientific | 2026 |
| Jpse Media Limited | Professional & scientific | 2011 |
| JR Cottrell Construction Ltd | Construction | 2026 |
| JR Electrical Services NW Limited | Construction | 2026 |
| JR Plastering (UK) Limited | Construction | 2014 |
| JR Tiling & Bathrooms Limited | Construction | 2018 |
| JR TM Suppliers Ltd | Construction | 2023 |
| Jrdl Property Ltd | Real estate | 2025 |
| JS Exclusive Properties Ltd | Construction | 2021 |
| JS Formwork Ltd | Manufacturing | 2025 |
| JS Learning Limited | Education | 2024 |
| JS Training Limited | Other services | 2020 |
| JSB Venture Limited | Real estate | 2021 |
| Jsbefit Limited | Arts & recreation | 2013 |
| JSC Legal Limited | Real estate | 2024 |
| Jsee Holdings Ltd | Financial services | 2026 |
| JSF Ltd | Wholesale & retail | 2022 |
| JSG Sportsturf Ltd | Administrative & support | 2023 |
| JSH Education Limited | Information & communication | 2002 |
| JSL Groundwork Ltd | Construction | 2022 |
| JSN Group Ltd | Health & social care | 2023 |