| Jrainterpreting Limited | Professional & scientific | 2007 |
| Jrdn Investments Ltd | Real estate | 2021 |
| JRH Healthcare Ltd | Health & social care | 2023 |
| Jrlh Limited | Health & social care | 2024 |
| Jrmh Ltd | Transport & logistics | 2022 |
| JSC Concrete Limited | Transport & logistics | 2024 |
| JSG Groundworks Ltd | Construction | 2020 |
| JSM Birkdale Ltd | Wholesale & retail | 2023 |
| JSM Rainford Ltd | Wholesale & retail | 2022 |
| Juan Grande Limited | Real estate | 1998 |
| Julie Mitchell Holdings Limited | Financial services | 2019 |
| Juno Beauty Ltd | Wholesale & retail | 2018 |
| Just ASK Scarlett Limited | Professional & scientific | 2015 |
| Just DO IT Ltd | Health & social care | 2012 |
| Just Wings Holdings Ltd | Financial services | 2017 |
| Justpowermusic Ltd | Information & communication | 2023 |
| Jvcl Investment Ltd | Real estate | 2021 |
| JWD Developments NW Limited | Construction | 2016 |
| Jwpw 25 Limited | Manufacturing | 2015 |
| K J Properties (NW) Limited | Real estate | 2026 |
| K K Developments (NW) Ltd | Other services | 2021 |
| K L H Electronics PLC | Professional & scientific | 1998 |
| K L H Limited | Other services | 1989 |
| K L J Project Services Limited | Construction | 2014 |
| Kaizen Building and Construction Ltd | Construction | 2024 |
| Kaizen MED UK Ltd | Health & social care | 2024 |
| Kaizen Windows & Doors Northwest Ltd | Construction | 2025 |
| Kalm Developments Ltd | Households | 2020 |
| Kamsam Holdings Limited | Financial services | 2023 |
| Kartsport Ltd | Manufacturing | 2025 |
| Katcom Ltd | Wholesale & retail | 2024 |
| Katira Medicos Ltd | Health & social care | 2020 |
| Kato Holdings Ltd | Financial services | 2023 |
| Kava Construction and Developments Ltd | Construction | 2020 |
| Kaya Ensor Films Limited | Information & communication | 2023 |
| KC Pilates Limited | Health & social care | 2025 |
| KCB Lettings Ltd | Real estate | 2021 |
| KCM Project Management Ltd | Professional & scientific | 2013 |
| KCW Property Services Limited | Real estate | 2017 |
| KD Carpentry & Building Services Limited | Construction | 2025 |
| Kdnm Holding Limited | Financial services | 2026 |
| Kdnm Land Limited | Real estate | 2026 |
| KDT Inspection Limited | Administrative & support | 2014 |
| Kealejones Ltd | Information & communication | 2025 |
| Kehoe Equestrian and Cattery Ltd | Agriculture & fishing | 2026 |
| Keith Clancy Plumbing and Heating Services Ltd | Construction | 2022 |
| Keith Smith Construction Ltd | Construction | 2013 |
| Kenyon Brothers Limited | Transport & logistics | 2013 |
| KEW Car Sales Limited | Wholesale & retail | 2003 |
| Key Eight Concierge Ltd | Other services | 2026 |
| Keyman Limited | Wholesale & retail | 2018 |
| KID Inc Limited | Financial services | 2014 |
| Kiddabean Ltd | Wholesale & retail | 2011 |
| Kindness Matters Ltd | Professional & scientific | 2012 |
| Kindrive Limited | Health & social care | 2025 |
| Kingdom Telecoms Ltd | Information & communication | 2022 |
| Kings Close (Haskayne) Management Company Limited | Real estate | 2014 |
| Kinvara Holdings Limited | Financial services | 2023 |
| Kirkman Consulting Ltd | Construction | 2024 |
| Kitten Beachwear Limited | Wholesale & retail | 2017 |
| Kitty Butler Limited | Wholesale & retail | 2014 |
| Kiwa Consultants (NW) Ltd | Hospitality | 2023 |
| KJ Roots Ltd | Real estate | 2025 |
| KJD Law Ltd | Professional & scientific | 2021 |
| KMC Locums Ltd | Wholesale & retail | 2025 |
| KMG & Sons Properties Limited | Real estate | 2025 |
| KMI Group Limited | Real estate | 2011 |
| KMR Capital Ltd | Professional & scientific | 2013 |
| Kmsg Property Management Limited | Real estate | 2026 |
| Knowsley Commercial Motors Limited | Manufacturing | 2016 |
| Knox Property Group Ltd | Construction | 2026 |
| KOI Capital Limited | Wholesale & retail | 2014 |
| Koolsolutions Air Conditioning & Ventilation Limited | Construction | 2016 |
| KP CNC Machine Tools Limited | Manufacturing | 2015 |
| KRB Human Resources Ltd | Administrative & support | 2026 |
| Krol Transport Ltd | Transport & logistics | 2021 |
| KSO Groundworks Ltd | Construction | 2008 |
| KSO Group Holdings Limited | Financial services | 2023 |
| KSW Investments Limited | Real estate | 2019 |
| KSW Retail Ltd | Wholesale & retail | 2021 |
| KTAA88 OMK Ltd | Other services | 2024 |
| Kurdish Barber Shop (Ormskirk) Ltd | Other services | 2021 |
| Kurt Fletcher Plumbing and Heating Limited | Construction | 2025 |
| Kwlc (UK) Limited | Real estate | 2008 |
| Kwlc Legal Costs Limited | Professional & scientific | 2015 |
| Kycia Properties Ltd | Real estate | 2022 |
| L G Commercial Cleaning Limited | Administrative & support | 2011 |
| L M Security Ltd | Administrative & support | 2019 |
| L&A Developments Ltd | Real estate | 2022 |
| L&P Mallinson Ltd | Hospitality | 2021 |
| L'Eau LA Ltd. | Wholesale & retail | 2018 |
| L.P.Developmentsuk Ltd | Construction | 2026 |
| L39 Food Trading Limited | Hospitality | 2024 |
| LA Cantina (Themalthouse) Limited | Hospitality | 2017 |
| LA Lucca Catering Limited | Hospitality | 2022 |
| LA Lucca Spanish Cleaning Products Limited | Wholesale & retail | 2020 |
| Laheen Systems Ltd | Professional & scientific | 2003 |
| LAL Social Media Ltd | Wholesale & retail | 2026 |
| Lancashire Breadhouse Limited | Manufacturing | 2016 |
| Lancashire Car Wash Ltd | Wholesale & retail | 2024 |