| Kibesh Food & Wine Limited | Wholesale & retail | 2016 |
| Kickstart Sport and Education Ltd | Arts & recreation | 2023 |
| Kiings Kurdish Barber Ltd | Other services | 2022 |
| Kiki Personalised Clothing and Gifts Limited | Wholesale & retail | 2023 |
| Kilic Oglu Ltd | Construction | 2020 |
| Kind Hands Bromborough Limited | Administrative & support | 2026 |
| Kingfisher Community Learning and Support CIC | Education | 2024 |
| Kings Court Management Co. Limited | Households | 1980 |
| Kingsgate Group Holdings Ltd | Financial services | 2023 |
| Kingsgate Holdings Limited | Real estate | 2020 |
| Kingsgate of London Ltd | Real estate | 2020 |
| Kinnaird Maintenance Limited | Households | 2010 |
| Kinnear Freelance Ltd | Wholesale & retail | 2017 |
| Kinstone Property Holdings Ltd | Real estate | 2025 |
| Kinvape Minimarket Ltd | Wholesale & retail | 2024 |
| Kirby Cottage Management Company Limited | Households | 2003 |
| Kirby Park Mansions Limited | Households | 2000 |
| Kirkdale House Limited | Wholesale & retail | 2019 |
| Kirkham Adhd Limited | Health & social care | 2021 |
| Kirsten Smith Limited | Professional & scientific | 2025 |
| Kismat Balti House Limited | Hospitality | 2025 |
| Kismet Garage Equipment UK Ltd. | Manufacturing | 2000 |
| Kiss Medical Supplies Ltd | Wholesale & retail | 2025 |
| Kitaconsulting Ltd | Professional & scientific | 2025 |
| Kitty Sweets New Chester Road Ltd | Hospitality | 2025 |
| KJ Anderson Mechtech Ltd | Manufacturing | 2024 |
| KJ Brickworks Limited | Construction | 2010 |
| KJ Properties Wirral Limited | Real estate | 2025 |
| Kjbconsultancy Limited | Construction | 2022 |
| KJD Management Services Limited | Professional & scientific | 2021 |
| KJF Lifestyle Ltd | Professional & scientific | 2024 |
| KJG Aero Consultants Ltd | Professional & scientific | 2025 |
| KJT Athletic Limited | Arts & recreation | 2013 |
| KK Yates Properties Ltd | Households | 2024 |
| Kkpcs Limited | Professional & scientific | 2013 |
| Klai's Koffee Limited | Manufacturing | 2019 |
| Klas Accountants & Bookkeeping Ltd | Professional & scientific | 2019 |
| Klas Administration Services Limited | Administrative & support | 2014 |
| Klas T/A Klas Accountants Ltd | Administrative & support | 2022 |
| KLG Home Properties Ltd | Real estate | 2025 |
| Klinique Medical Aesthetics Limited | Health & social care | 2019 |
| Klip Global Ltd | Wholesale & retail | 2020 |
| KLJ Ventures Ltd | Wholesale & retail | 2023 |
| KLM NDT Ltd | Professional & scientific | 2022 |
| KLN 668 Limited | Hospitality | 2026 |
| KMC Automation Limited | Professional & scientific | 2023 |
| KMC Couriers (NW) Ltd | Transport & logistics | 2020 |
| Kmdhecho Limited | Health & social care | 2023 |
| KMG Promotions Ltd | Professional & scientific | 2016 |
| Kmhughes Consulting Ltd | Information & communication | 2012 |
| KMP Consultants Ltd | Professional & scientific | 2016 |
| Knossos PMS Ltd | Professional & scientific | 2000 |
| Knotty ASH Nursery Limited | Education | 2010 |
| Knucklebuster Games Ltd | Information & communication | 2022 |
| KOA Design Ltd | Manufacturing | 2020 |
| Kobi Properties Ltd | Hospitality | 2020 |
| Kodiak Group Ltd | Wholesale & retail | 2020 |
| Kolben Limited | Wholesale & retail | 2013 |
| Komei Reformer Pilates Limited | Arts & recreation | 2025 |
| Komyokan Ltd. | Other services | 1989 |
| Koppel Limited | Information & communication | 2023 |
| Korleone Properties Limited | Real estate | 2022 |
| Kraken Comics Ltd | Wholesale & retail | 2025 |
| Kraken Maritime Ltd | Administrative & support | 2021 |
| Krbb Ltd | Hospitality | 2023 |
| KRK International Business Consulting Ltd | Construction | 2024 |
| KRK Productions Ltd | Information & communication | 2022 |
| Krts International Ltd | Health & social care | 2010 |
| KS Building Contractors NW Ltd | Construction | 2022 |
| Ks-Elec Ltd | Energy | 2017 |
| KTD Financial Limited | Other services | 2015 |
| KTL Studio's Limited | Other services | 2021 |
| KTP Trading Limited | Extraterritorial | 2015 |
| Kuzu Ltd | Wholesale & retail | 2025 |
| KWJ Electrical Limited | Construction | 2015 |
| Kyber Security Limited | Information & communication | 2022 |
| Kyle Owen Couriers Ltd | Transport & logistics | 2023 |
| Kylie Jenner Ltd | Information & communication | 2011 |
| KYN Analytics Limited | Information & communication | 2025 |
| Kzndrakensburg Data Cabling Limited | Information & communication | 2017 |
| L & M Hospitality Ltd | Hospitality | 2024 |
| L & R Couriers Ltd. | Transport & logistics | 2015 |
| L a Hair ( Hoylake ) Ltd | Other services | 2020 |
| L Hopkins Consultants Limited | Professional & scientific | 2017 |
| L J Doran Ltd | Professional & scientific | 2026 |
| L J Drylining Ltd | Construction | 2002 |
| L K Pharma-Services Limited | Professional & scientific | 2004 |
| L L Engineering Limited | Real estate | 2022 |
| L&B Property (Wirral) Ltd | Real estate | 2022 |
| L&H Fire & Security Limited | Public administration | 2014 |
| L'Accrued Limited | Real estate | 2013 |
| L. J. Lucas Roofing Limited | Construction | 2006 |
| L.A.C Roofing NW Limited | Construction | 2024 |
| L.C. Gardening & Tree Services Ltd | Administrative & support | 2024 |
| L.C.A. Property Holdings Ltd | Real estate | 2022 |
| L.J. Cammell (Merseyside) Limited | Manufacturing | 1977 |
| L.Stubbs Logistics Ltd | Transport & logistics | 2020 |
| L1 Brewer Ltd | Manufacturing | 2012 |
| LA Luce DEL Sole Ltd | Hospitality | 2016 |
| La-Lé Wellness Ltd | Arts & recreation | 2026 |