| Jacobs Solicitors Ltd | Professional & scientific | 2012 |
| Jacqueline Mount Ltd | Extraterritorial | 2024 |
| Jacqui Dental Limited | Health & social care | 2025 |
| Jaico Ltd | Manufacturing | 2025 |
| Jaks Renewables Ltd | Construction | 2022 |
| James Taylor Consultants Ltd | Financial services | 2018 |
| James' Business Limited | Construction | 2016 |
| JAP Auto Imports Ltd | Wholesale & retail | 2018 |
| JAS Toothfairy Ltd | Health & social care | 2023 |
| Jase Goff Training Academy Ltd | Education | 2025 |
| JB Car Care Limited | Other services | 2020 |
| JB Partners Ltd | Wholesale & retail | 2024 |
| JB Plugging Ltd. | Other services | 2017 |
| JB Real Estate Liverpool Limited | Real estate | 2008 |
| JC Consultancy Group Ltd | Professional & scientific | 2019 |
| JC Enderby Limited | Hospitality | 2021 |
| JCE & Co Investments Ltd | Real estate | 2019 |
| JCL Consultancy Services Limited | Professional & scientific | 2015 |
| JCL Skills Solutions Limited | Professional & scientific | 2022 |
| Jclivep Developments Ltd | Real estate | 2021 |
| JCP Property Management Maintenance & Landscaping Ltd | Households | 2023 |
| JDP Interior Systems Ltd | Construction | 2026 |
| Jedan Industrial Silencers Ltd | Manufacturing | 2024 |
| JEL Construction Services Ltd | Construction | 2021 |
| Jennings Safety Services Ltd | Professional & scientific | 1999 |
| JFH Inspection Ltd | Professional & scientific | 2018 |
| Jgwill Limited | Health & social care | 2020 |
| Jigl Limited | Health & social care | 2010 |
| Jigsaw Workforce Solutions Limited | Administrative & support | 2019 |
| Jjfi 24HR Homecare Limited | Health & social care | 2016 |
| Jkcrossley Ltd | Health & social care | 2023 |
| Jlmm Holdings Limited | Financial services | 2023 |
| Jmarketing Central Ltd | Professional & scientific | 2026 |
| JMC and Co Properties Ltd | Real estate | 2023 |
| JMC Haulage Ltd | Transport & logistics | 2026 |
| JMP Courier Limited | Transport & logistics | 2024 |
| JMT Dental Ltd | Health & social care | 2025 |
| JOE Boghiu Ltd | Construction | 2013 |
| Johansson Structural Ltd | Professional & scientific | 2014 |
| John David Bold Limited | Wholesale & retail | 2015 |
| Jorge Lima Limited | Health & social care | 2026 |
| Joseph Henesy Limited | Financial services | 2016 |
| JPB IT Consultancy Limited | Information & communication | 2014 |
| Jpfb Ltd | Financial services | 2024 |
| JPO Barbering Limited | Other services | 2017 |
| Jrap Solutions Ltd | Health & social care | 2022 |
| JRH Hot Foods Ltd | Hospitality | 2026 |
| JRL Occupational Health Solutions Ltd | Health & social care | 2017 |
| JS Supply Ltd | Wholesale & retail | 2025 |
| Jsep Limited | Arts & recreation | 2012 |
| JSH Pipe Services Ltd | Construction | 2012 |
| Jspr Holdings Limited | Health & social care | 2022 |
| Jssoftwares Ltd | Information & communication | 2026 |
| JST Construction Limited | Construction | 2007 |
| JST Limited | Extraterritorial | 2014 |
| JST Property Rentals Ltd | Real estate | 2020 |
| Jtkp Ltd | Health & social care | 2023 |
| JTS Dental Limited | Health & social care | 2026 |
| Jugs Liverpool Limited | Hospitality | 2018 |
| Julie Leadbetter Consultancy Limited | Professional & scientific | 2024 |
| Jump on Demand Limited | Wholesale & retail | 2026 |
| Junction 8 Tile & Stone Limited | Wholesale & retail | 2009 |
| Juntos EM Londres Limited | Transport & logistics | 2020 |
| Justinhall Ltd | Health & social care | 2024 |
| Jwforge Ltd | Wholesale & retail | 2025 |
| JWH Inspection Services Ltd | Professional & scientific | 2011 |
| JWN Properties Limited | Real estate | 2017 |
| K & N Filters (Europe) Limited | Manufacturing | 1981 |
| K a Aircraft Solutions Limited | Manufacturing | 2026 |
| K and a Law Associates Limited | Administrative & support | 2025 |
| K Dunning Ltd | Health & social care | 2022 |
| K Goad Ltd | Health & social care | 2024 |
| K S Lawty Ltd | Health & social care | 2023 |
| K&T @ the Gunners Ltd | Hospitality | 2024 |
| K. Hawkins Investments Limited | Construction | 1997 |
| K. Merone Roofing Ltd | Construction | 2013 |
| K.A.S.Inspection Limited | Professional & scientific | 2017 |
| K11LON Consultancy Limited | Administrative & support | 2019 |
| KAB Food Ltd | Hospitality | 2026 |
| Kahale Dental Limited | Health & social care | 2020 |
| Kalina Dent Limited | Health & social care | 2015 |
| Kambo Clarity Ltd | Other services | 2017 |
| Kamperbitz Ltd | Wholesale & retail | 2019 |
| Karls Boxed Ltd | Hospitality | 2024 |
| Kasiananth Anaesthesia Ltd | Health & social care | 2023 |
| Kasvu Advisory Limited | Professional & scientific | 2024 |
| Katech Ingredient Solutions Ltd | Professional & scientific | 2010 |
| Kattegatt Limited | Real estate | 2025 |
| KAY Dent Ltd | Health & social care | 2021 |
| Kazi's Smart Hairs CUT Ltd | Other services | 2019 |
| KB Chesworth Ltd | Professional & scientific | 2019 |
| KB Firestopping Ltd | Public administration | 2024 |
| KB Morris Property Ltd | Real estate | 2024 |
| KD7 Consulting Ltd | Professional & scientific | 2024 |
| Kebab Cheshire Ltd | Hospitality | 2026 |
| Keenan ENG CI Limited | Professional & scientific | 2025 |
| Keith Lowe Motor Vehicle Repairs Limited | Wholesale & retail | 2011 |
| Kellie Solutions Limited | Professional & scientific | 2008 |
| Kendall Adventures Ltd | Administrative & support | 2026 |
| Kennedy Advisory Ltd | Professional & scientific | 2026 |