| Kamen DEL Ltd | Other services | 2018 |
| Karalius Bros.Limited | Transport & logistics | 1971 |
| Karalius Brothers Waste Limited | Wholesale & retail | 1991 |
| Karalius Holdings Ltd | Wholesale & retail | 2022 |
| Karalius Metal Recycling Ltd | Water & waste | 2020 |
| Karen Shaw Aesthetics Ltd | Other services | 2023 |
| Karl Reed Finance Limited | Real estate | 2026 |
| Karolev Limited | Transport & logistics | 2017 |
| Kasper's Wheels Limited | Wholesale & retail | 2019 |
| Kathryn Sullivan Limited | Other services | 2018 |
| Katie ADA Burke Limited | Extraterritorial | 2026 |
| Katrina Jones Ltd | Arts & recreation | 2021 |
| Kautoman Limited | Hospitality | 2018 |
| Kb&Co Tiling Ltd | Construction | 2025 |
| KBB Specialist Removals Limited | Transport & logistics | 2020 |
| Kbth Ltd | Hospitality | 2023 |
| KC Accounting Limited | Professional & scientific | 2009 |
| KC Packaging Limited | Administrative & support | 2019 |
| KCA Medical Ltd | Health & social care | 2024 |
| KCM Construction NW Ltd | Construction | 2025 |
| KDU Clean&Drive Ltd | Transport & logistics | 2021 |
| Keep Energy Contracts Limited | Energy | 2019 |
| Keep Energy Investments Limited | Professional & scientific | 2014 |
| Keep Energy M & E Limited | Energy | 2019 |
| Kelios Spedition Ltd | Transport & logistics | 2016 |
| Kelsall Property Group Limited | Real estate | 2025 |
| Keowski Limited | Real estate | 2025 |
| Kerim Trans Ltd | Transport & logistics | 2021 |
| Kevin Mcintyre School of Motoring Ltd | Education | 2015 |
| Kewb Care Limited | Health & social care | 2025 |
| Key Cars (Halton) Limited | Other services | 2018 |
| Keys 2 Code Limited | Wholesale & retail | 2023 |
| Keystone Axia Ltd | Information & communication | 2025 |
| KG & G Services Ltd | Construction | 2014 |
| KG Land Developments Ltd | Construction | 2026 |
| KGS Chemicals Ltd | Manufacturing | 2023 |
| Kiing Pizza & Kebab Ltd | Hospitality | 2024 |
| Kimberley Land Limited | Extraterritorial | 2024 |
| Kimson Accountancy Limited | Professional & scientific | 2020 |
| King Edward Court Residents Limited | Other services | 2004 |
| Kinsellas Painting and Decorating Services Ltd | Construction | 2025 |
| Kinsellas Property Investments Ltd | Real estate | 2024 |
| Kiri Houghton Limited | Health & social care | 2019 |
| Kirsch Distribution Limited | Education | 2022 |
| Kitchen & TAP Co. Limited | Hospitality | 2015 |
| Kitchenmark.Uk Ltd | Wholesale & retail | 2020 |
| Kitchens by Leanne Limited | Manufacturing | 2008 |
| Kits for ALL Widnes Ltd | Wholesale & retail | 2019 |
| KJ Plumbing & Heating (Cheshire) Ltd | Construction | 2022 |
| KJ Skin Training Academy Ltd | Other services | 2026 |
| KJT3 Limited | Wholesale & retail | 2024 |
| KK11 Ltd | Professional & scientific | 2023 |
| KLA Barber Ltd | Other services | 2026 |
| KLB Financial Management Ltd | Professional & scientific | 2018 |
| KMB Support Management Limited | Administrative & support | 2016 |
| KMB73 Limited | Administrative & support | 2023 |
| Knightspire Ltd | Construction | 2025 |
| Kobbie Mainoo Limited | Administrative & support | 2026 |
| Konkurent Trans L Limited | Transport & logistics | 2017 |
| Kore UK Group Ltd | Construction | 2026 |
| Kossama-Trans Ltd | Other services | 2018 |
| Kostas Kallika Limited | Transport & logistics | 2017 |
| KR Plumbing Heating Limited | Construction | 2025 |
| Krorion Transporting Ltd | Transport & logistics | 2021 |
| KRS Industrial Roofing Ltd | Construction | 2021 |
| KSM Trading AS the Fish Company Ltd | Wholesale & retail | 2011 |
| KWM Property Limited | Real estate | 2020 |
| Kyasha Hair, Beauty & Aesthetics Ltd | Other services | 2024 |
| Kyra Bluewaters Limited | Other services | 2014 |
| L a Engineering Steel Services Ltd | Construction | 2022 |
| L Knight Property Ltd | Real estate | 2021 |
| L&A Engineering & Construction Ltd | Construction | 2026 |
| L&Wliftinginc Ltd | Construction | 2022 |
| L. Roberts Construction Ltd | Information & communication | 2018 |
| L.C.I. (Widnes) Ltd | Professional & scientific | 2009 |
| LA Property Maintenance Ltd | Administrative & support | 2025 |
| Ladder Therapeutics Limited | Professional & scientific | 2022 |
| Lads Property Ltd | Real estate | 2024 |
| Lalique Property Investments Ltd | Health & social care | 2024 |
| Lambros Paving Contractors Limited | Construction | 1988 |
| Lambros Properties Limited | Real estate | 2024 |
| Lamont Chauffeur Services (UK) Limited | Transport & logistics | 2009 |
| Lamont Lettings Ltd | Real estate | 2013 |
| Lamont Properties Ltd | Real estate | 2020 |
| Lana Composite Ltd | Manufacturing | 2026 |
| Landscape & Groundwork Solutions Limited | Administrative & support | 2019 |
| Landscape Construction Inspections Limited | Professional & scientific | 2026 |
| Landscape World Limited | Professional & scientific | 2009 |
| Landwood Ltd | Professional & scientific | 2020 |
| Lane Tennis Club Limited | Arts & recreation | 2005 |
| Langtree Care Ltd | Construction | 2014 |
| Lanxess Chemical Ltd | Manufacturing | 2001 |
| Lara Joy Property 2 Ltd | Real estate | 2021 |
| Lara Joy Property Ltd | Real estate | 2020 |
| Larcun Ltd | Construction | 2026 |
| Lathom Property Investments Ltd | Health & social care | 2024 |
| Lauren Powter Collective Limited | Professional & scientific | 2026 |
| Lawdriving Limited | Transport & logistics | 2026 |
| Lawson Diesel Engineering Ltd | Wholesale & retail | 2010 |
| LB Brickwork Ltd | Construction | 2017 |