| Kressel Regeneration Limited | Professional & scientific | 2010 |
| Krest Services Limited | Health & social care | 2020 |
| Krishi Ltd | Information & communication | 2021 |
| KRJ Avionics Ltd | Administrative & support | 2025 |
| KRJ Project Management Limited | Information & communication | 2016 |
| Kron Consulting Ltd | Administrative & support | 2010 |
| Kronetronics Ltd | Administrative & support | 2023 |
| Kross Sound Limited | Manufacturing | 2022 |
| Krpower Ltd | Construction | 2022 |
| KRS Comms Limited | Information & communication | 2025 |
| Kruse Data Limited | Administrative & support | 2022 |
| Krypton Chemical (UK) Ltd | Construction | 2017 |
| Krystyna Price Dance Events Limited | Arts & recreation | 2025 |
| Krzys Transport Limited | Transport & logistics | 2014 |
| KS Process Engineering Limited | Professional & scientific | 2020 |
| KSA Solutions Limited | Information & communication | 2005 |
| KSD Education Limited | Education | 2021 |
| KSD Education Services Limited | Education | 2022 |
| KSE Transport Ltd | Transport & logistics | 2020 |
| KSH Fisheries Ltd | Hospitality | 2013 |
| KSM2 Ltd | Administrative & support | 2023 |
| Kson Projects Ltd | Administrative & support | 2024 |
| KSP Business Consultancy Ltd | Information & communication | 2018 |
| KSQ Technology Limited | Information & communication | 2012 |
| KT Essentials Distributions Limited | Wholesale & retail | 2025 |
| KTH Logistics Ltd | Transport & logistics | 2019 |
| Ktreno’S Ltd | Construction | 2026 |
| KTS Electrical NW Ltd | Manufacturing | 2025 |
| KTW Consultancy Limited | Professional & scientific | 2025 |
| Ktwell Designs Ltd | Professional & scientific | 2026 |
| Kudos Services Limited | Construction | 2019 |
| Kudos Upholstery & Interiors Limited | Professional & scientific | 2023 |
| Kurdistan Supermarket 1 Ltd | Wholesale & retail | 2025 |
| Kurdoo Warrington Ltd | Hospitality | 2025 |
| Kurple Ltd | Professional & scientific | 2014 |
| Kurvic Limited | Professional & scientific | 2018 |
| Kutokwa Limited | Health & social care | 2022 |
| KVA Northwest Ltd | Real estate | 2014 |
| KW Thermal Limited | Professional & scientific | 2018 |
| Kwality Hotel Limited | Hospitality | 2023 |
| Kwality Print and Design Ltd | Manufacturing | 2012 |
| Kwality Property Ltd | Hospitality | 2021 |
| Kwik Fixup Ltd | Wholesale & retail | 2026 |
| Kwintech Services Limited | Information & communication | 2017 |
| KWJ Planning Limited | Professional & scientific | 2019 |
| KWJ Solutions Ltd | Wholesale & retail | 2017 |
| KWJ Valeting Ltd | Administrative & support | 2021 |
| KWS Scaffolding Ltd | Construction | 2019 |
| Kxfashion Limited | Wholesale & retail | 2018 |
| Kybelnetix Limited | Other services | 2010 |
| Kybern Ltd | Information & communication | 2026 |
| Kyle Foster Limited | Administrative & support | 2012 |
| Kyper Energy Ltd | Professional & scientific | 2025 |
| Kyriakos Limited | Administrative & support | 2014 |
| KZ Hockley Ltd | Administrative & support | 2024 |
| KZN DC Limited | Professional & scientific | 2016 |
| L & a Automation Limited | Administrative & support | 2012 |
| L & F Solutions Limited | Professional & scientific | 2006 |
| L & M Precision Limited | Manufacturing | 2017 |
| L & N Properties (Warrington) Limited | Real estate | 2004 |
| L & W Heating & Plumbing Limited | Construction | 2002 |
| L & W Mechanical Fitters Ltd | Administrative & support | 2025 |
| L a Property Discovery Limited | Real estate | 2020 |
| L Arthur Construction Limited | Construction | 2018 |
| L Bramhall Limited | Hospitality | 2020 |
| L D Maintenance & Repairs Ltd | Construction | 2023 |
| L Dobson Contracting Limited | Manufacturing | 2015 |
| L E Grounds Ltd | Administrative & support | 2026 |
| L G Consultancy NW Limited | Administrative & support | 2025 |
| L H Tuition Limited | Administrative & support | 2023 |
| L Hunt Engineering Limited | Administrative & support | 2024 |
| L J Inwood Ltd | Professional & scientific | 2024 |
| L Jacob Properties Ltd | Households | 2025 |
| L M Croughton Ltd | Health & social care | 2026 |
| L M Plumbing & Joinery Ltd | Construction | 2020 |
| L P P Consultants Ltd | Professional & scientific | 2005 |
| L S (Beech Road) Limited | Hospitality | 2007 |
| L S Lowry Prints Ltd | Wholesale & retail | 2021 |
| L S R Refrigeration & Air Conditioning Limited | Construction | 2004 |
| L Shop Ltd | Wholesale & retail | 2021 |
| L Washington Leisure Ltd | Hospitality | 2023 |
| L Whittle Advisory Ltd | Professional & scientific | 2026 |
| L&E Testing Solutions Ltd | Administrative & support | 2025 |
| L&J Concepts Limited | Arts & recreation | 2023 |
| L&Lea Limited | Administrative & support | 2020 |
| L&N Haulage Ltd | Transport & logistics | 2021 |
| L&Z Engineering Ltd | Professional & scientific | 2022 |
| L'Grande Boutique Ltd | Wholesale & retail | 2022 |
| L. J. Integrated Services Limited | Construction | 2017 |
| L. Jacobs Associates Ltd | Administrative & support | 2025 |
| L.A.Dean & Sons Limited | Real estate | 2017 |
| L.E Chubb Ltd | Administrative & support | 2026 |
| L.N.L. Properties Limited | Real estate | 1979 |
| L4GH Investment Limited | Other services | 2017 |
| L4GH Property Limited | Real estate | 2022 |
| L8 Solutions Ltd | Information & communication | 2005 |
| LA Beau Fleurs Limited | Wholesale & retail | 2022 |
| LA Bianco Ltd | Hospitality | 2023 |
| LA Cala Lettings Limited | Real estate | 2026 |
| LA Forza (UK) Ltd | Wholesale & retail | 2018 |