| KP Sourcing Limited | Professional & scientific | 2025 |
| KP Twins Limited | Real estate | 2025 |
| Kpler Ltd | Transport & logistics | 2017 |
| Kpler UK Holdco Limited | Financial services | 2023 |
| Kpmaddison Consulting Limited | Administrative & support | 2015 |
| Kpriest Solutions Limited | Information & communication | 2025 |
| KPU Healthcare Ltd | Health & social care | 2020 |
| Kraton Chemical Ltd | Manufacturing | 1981 |
| Krav Maga System Limited | Professional & scientific | 2008 |
| Krcs Holdco Limited | Professional & scientific | 2010 |
| Kreative Properties Limited | Real estate | 2017 |
| Kris Place Limited | Real estate | 2023 |
| KRL (LR EXT) Limited | Energy | 2012 |
| KRL (LR) Hold Co Limited | Energy | 2015 |
| KRL (LR) Limited | Professional & scientific | 2010 |
| KRU Ltd | Wholesale & retail | 2021 |
| Krula Limited | Professional & scientific | 2023 |
| Krunpoint Ltd | Real estate | 2014 |
| Kryptonics Housing Limited | Real estate | 2022 |
| Kryptonics Primenests Ltd | Real estate | 2025 |
| KS Dental Care Limited | Health & social care | 2011 |
| KS Digital Services Limited | Information & communication | 2025 |
| KS Optical Ltd | Health & social care | 2009 |
| Ksapec Limited | Arts & recreation | 2025 |
| KSR Advanced Beauty and Training Academy Ltd | Other services | 2025 |
| KSR Ventures Ltd | Wholesale & retail | 2025 |
| KSS Solutions Limited | Professional & scientific | 2022 |
| KSY Design Limited | Professional & scientific | 2016 |
| KT Recycling Solutions Ltd | Water & waste | 2018 |
| Ktesg Limited | Administrative & support | 2016 |
| KTL Sports, Prestige and Classics Ltd | Wholesale & retail | 2020 |
| Kubb Property Ltd | Real estate | 2021 |
| Kudos Legal Support Services Limited | Professional & scientific | 2006 |
| KUN DEE Ltd | Hospitality | 2022 |
| Kunz Therapeutics Ltd | Professional & scientific | 2018 |
| Kuppel Ltd | Information & communication | 2026 |
| Kurdish Delight Rhyl Limited | Hospitality | 2016 |
| Kurio Creative Limited | Professional & scientific | 2010 |
| Kutchenhaus Altrincham Ltd | Wholesale & retail | 2019 |
| Kuvridge Strategies Limited | Information & communication | 2023 |
| KVS Developments Ltd | Real estate | 2022 |
| KW Aircraft Electrical Limited | Professional & scientific | 2026 |
| KWF Commercials Ltd | Wholesale & retail | 2023 |
| KWH Holdings Limited | Professional & scientific | 2022 |
| KWS Investment Limited | Real estate | 2023 |
| KY GIN Consulting Services Limited | Information & communication | 2026 |
| Kyrios Osher Limited | Real estate | 2021 |
| Körber Supply Chain GB Ltd | Information & communication | 2021 |
| Körber Supply Chain Limited | Construction | 2013 |
| L & F Global Limited | Real estate | 2023 |
| L & G Childcare Limited | Extraterritorial | 2017 |
| L & G Homes Limited | Real estate | 1999 |
| L & R Trading (North West) Limited | Administrative & support | 2015 |
| L a School of Dance Limited | Education | 2011 |
| L Build Limited | Construction | 2024 |
| L C Gregory Property Maintenance Ltd | Construction | 2025 |
| L M Models Ltd | Administrative & support | 2025 |
| L Marks Limited | Professional & scientific | 2011 |
| L Nash Engineering Management Services Limited | Professional & scientific | 2024 |
| L Quinn Consultancy Limited | Professional & scientific | 2018 |
| L V Living Ltd | Real estate | 2020 |
| L Walton Consulting Limited | Professional & scientific | 2023 |
| L&H Limited | Hospitality | 2023 |
| L&L Marketing Limited | Professional & scientific | 2016 |
| L&Nwr Company Limited | Transport & logistics | 2015 |
| L&O Homes Ltd | Real estate | 2023 |
| L&S Buchanan Consulting Limited | Professional & scientific | 2025 |
| L'Amour NO. 4 Limited | Other services | 2026 |
| L2K Communications Ltd | Professional & scientific | 2016 |
| L2O Enterprise Ltd | Wholesale & retail | 2015 |
| L6 Property Investments Ltd | Real estate | 2026 |
| LA Boheme Restaurant Limited | Hospitality | 2020 |
| LA Brisa Films Limited | Information & communication | 2024 |
| LA Calma Natural Health Ltd | Professional & scientific | 2023 |
| LA Cheshire Consulting Ltd | Other services | 2025 |
| LA Cheshire Limited | Wholesale & retail | 2024 |
| LA Forme Ltd | Wholesale & retail | 2024 |
| LA Italia Limited | Hospitality | 2026 |
| LA Manga Direct Limited | Extraterritorial | 1999 |
| LA Pizza Grill Limited | Hospitality | 2025 |
| LA UK Consulting Limited | Information & communication | 2011 |
| LAB NW Ltd | Real estate | 2024 |
| Labelling Matters Limited | Extraterritorial | 1999 |
| Labradyb Properties Ltd | Real estate | 2024 |
| Laburnum Court Property Management Company Limited | Households | 2004 |
| Labware Limited | Information & communication | 1995 |
| Lace and Thread Limited | Manufacturing | 2020 |
| Lace of Nass Ltd | Wholesale & retail | 2024 |
| Lacuna Clientscope Limited | Information & communication | 2017 |
| Lacuna Solutions EBT Limited | Information & communication | 2017 |
| Lacuna Solutions Limited | Information & communication | 2011 |
| Ladbrokelife Limited | Administrative & support | 2025 |
| Ladder Property Ltd | Real estate | 2023 |
| Laduma Creative Enterprises Limited | Information & communication | 2016 |
| Laduma Limited | Professional & scientific | 2015 |
| Ladybarn Road Estates Ltd | Real estate | 2018 |
| Ladybower Limited | Professional & scientific | 2024 |
| Ladybrook Management (Bramhall) Limited | Households | 1971 |
| Ladybrook Properties Ltd | Hospitality | 2021 |
| Ladyhill Healthcare Ltd | Health & social care | 2013 |