| JN Online Ltd | Other services | 2022 |
| JNB Consultants Limited | Information & communication | 2017 |
| Jnix Accommodation Limited | Real estate | 2025 |
| JO Sloanes Exteriors Ltd | Administrative & support | 2022 |
| JO Sloanes Ltd | Wholesale & retail | 2018 |
| Joam Group Limited | Professional & scientific | 2016 |
| Joarr Hot Food Emporium Limited | Wholesale & retail | 2016 |
| Joecat Couriers Ltd | Transport & logistics | 2012 |
| John Fewtrell Gardening Services Ltd | Administrative & support | 2002 |
| John H.Weatherby (Memorials) Limited | Construction | 1958 |
| John Latham Limited | Construction | 1995 |
| Johnmilli Healthcare Ltd | Health & social care | 2018 |
| Johnsons (Churchtown) Limited | Wholesale & retail | 1945 |
| Johnsons of Burscough Ltd | Transport & logistics | 2025 |
| Johnsons Scrap Metal Limited | Water & waste | 1984 |
| Joint Venture Ltd | Construction | 2001 |
| Joint- Heirs Consulting Ltd. | Professional & scientific | 2015 |
| Jokbox Limited | Extraterritorial | 2013 |
| Jolly Tails Ltd | Construction | 2021 |
| Jonathan Cunningham Ltd | Arts & recreation | 2012 |
| Jonathan Smyth - Renshaw & Associates Limited | Professional & scientific | 2003 |
| Jones & Kearns Ltd | Wholesale & retail | 2015 |
| Jones Business Strategy Ltd | Professional & scientific | 2023 |
| Joni Holdings Ltd | Real estate | 2018 |
| Jordan Woodrows Limited | Manufacturing | 1995 |
| Joseph Gilbert Ltd | Real estate | 2021 |
| JP Learning Limited | Administrative & support | 2019 |
| JP Transportation Ltd | Transport & logistics | 2022 |
| Jprc Ltd | Information & communication | 2014 |
| JRE Associates Ltd | Professional & scientific | 2009 |
| JRE Holdings Ltd | Real estate | 2020 |
| JRH Paving & Groundwork Limited | Administrative & support | 2023 |
| Jrhr Limited | Administrative & support | 2019 |
| JRO Management Limited | Other services | 2014 |
| JRS Invest Ltd | Real estate | 2025 |
| JS Consultancy (FE) Ltd | Professional & scientific | 2025 |
| JS Joinery (NW) Ltd | Construction | 2011 |
| JS Van Hire (Chorley) Ltd | Administrative & support | 2024 |
| Jsbakery Ltd | Hospitality | 2026 |
| Jslhp Ltd | Transport & logistics | 2019 |
| Jsnth Ltd | Wholesale & retail | 2025 |
| JT Mobility Solutions Ltd | Health & social care | 2022 |
| JTL Landscapes Ltd | Administrative & support | 2016 |
| Jube Consulting Limited | Information & communication | 2005 |
| JUDE2 Limited | Real estate | 2020 |
| JUDE3 Limited | Professional & scientific | 2023 |
| Juemlu Ltd | Hospitality | 2019 |
| Juice Accounting (UK) Ltd | Professional & scientific | 2021 |
| Julie Brandon Freelance Bookkeeping Limited | Professional & scientific | 2008 |
| Julie Tandy Fine Art Ltd | Arts & recreation | 2024 |
| Julieta Care UK Ltd | Administrative & support | 2018 |
| Jump Nation Ltd | Arts & recreation | 2013 |
| Junoon Indian Restaurant Ltd | Other services | 2020 |
| Jupiter Child Care Services Ltd | Health & social care | 2024 |
| Jupiter Properties NW Limited | Real estate | 2024 |
| Jurassic Sherpa Ltd | Wholesale & retail | 2025 |
| Just Boilers & Plumbing Ltd | Construction | 2019 |
| Just Cats Veterinary Clinic Limited | Professional & scientific | 2006 |
| Justmagento Ltd | Information & communication | 2021 |
| Justvybe Ltd | Information & communication | 2026 |
| JW HR Ltd | Professional & scientific | 2019 |
| JWC Associates Ltd | Administrative & support | 2013 |
| K & K Global Merchandise Limited | Transport & logistics | 2014 |
| K & M Training and Development Ltd | Professional & scientific | 2024 |
| K C Workwear Ltd | Manufacturing | 2010 |
| K Davies Plumbers Ltd | Construction | 2025 |
| K Street Accommodation Ltd | Real estate | 2023 |
| K W Group Management Ltd | Real estate | 2025 |
| K Warwick Limited | Health & social care | 2020 |
| K&I Service & Investment Limited | Transport & logistics | 2024 |
| K. G. Electrics Limited | Professional & scientific | 2007 |
| K. H. Accountants (N.W.) Ltd | Professional & scientific | 2026 |
| K.A.B. Enterprises (UK) Ltd | Professional & scientific | 2011 |
| K.B. Spigot Limited | Arts & recreation | 2007 |
| K.Grimoldby.Roofing Services Ltd | Construction | 2024 |
| K.P. Retail Solutions Limited | Professional & scientific | 2006 |
| K.Stockley and Sons Building and Roofing Limited | Construction | 2023 |
| K2 Coldstores Ltd | Manufacturing | 2025 |
| K28 Heating and Boiler Solutions Ltd | Construction | 2026 |
| KA Wall Limited | Transport & logistics | 2018 |
| Kadan Construction Limited | Construction | 1994 |
| Kaede & Arca Ltd | Wholesale & retail | 2024 |
| KAI Performance Limited | Wholesale & retail | 2025 |
| Kaiman Group Co. Ltd | Wholesale & retail | 2025 |
| Kaitlin Ltd | Wholesale & retail | 2018 |
| Kaleidoscope Arts Ltd | Education | 2023 |
| Kamah Properties Ltd | Real estate | 2012 |
| Kamkos Inspirations Limited | Health & social care | 2015 |
| Kane & Kane Kitchens Ltd | Professional & scientific | 2019 |
| Kangaroo Miusic Ltd | Transport & logistics | 2025 |
| Kangaroo Skip Hire Limited | Water & waste | 2021 |
| Kanusa Properties Limited | Real estate | 2021 |
| Karas Plating Limited | Manufacturing | 1994 |
| Karen Potter Limited | Real estate | 2012 |
| Karen Pritchard Jewellers Limited | Wholesale & retail | 2018 |
| Karlisa Ltd | Professional & scientific | 2022 |
| Karmaology Limited | Professional & scientific | 2020 |
| Karwowski Motors Ltd | Wholesale & retail | 2024 |
| Kasturi Southport Limited | Hospitality | 2017 |
| Kate Wilkinson Enterprises Ltd | Wholesale & retail | 2018 |