| Kontiki Holdings Ltd | Financial services | 2020 |
| Kontiki Investments Ltd | Real estate | 2020 |
| Koots Limited | Extraterritorial | 2009 |
| KOR Law Legal Consultancy Practice Ltd | Professional & scientific | 2026 |
| Koralena Ltd | Professional & scientific | 2021 |
| Kori Finances Ltd | Professional & scientific | 2021 |
| Korlo Kebabs Limited | Hospitality | 2017 |
| Kortl Ltd | Professional & scientific | 2026 |
| Korvian Estates Ltd | Real estate | 2026 |
| Kosha Connect Holistic Ltd | Health & social care | 2025 |
| Kotiva Technologies Limited | Information & communication | 2017 |
| Kova Manufacturing Limited | Manufacturing | 1992 |
| Koza Epsom Limited | Hospitality | 2025 |
| KP Golden Keys Group Ltd | Construction | 2023 |
| Kpathma Properties Limited | Real estate | 2026 |
| Kpdc International Limited | Wholesale & retail | 2024 |
| KPH Electrical Ltd | Construction | 2017 |
| KPH Electrical Testing Ltd | Construction | 2023 |
| KR Creative House Limited | Other services | 2025 |
| Kraken Locksmith Limited | Other services | 2026 |
| Kraken Marine Industries Ltd | Extraterritorial | 2026 |
| KRASS7 Ltd | Administrative & support | 2025 |
| Kraverschoice Caribbean Kitchen Ltd | Hospitality | 2025 |
| KRD London Ltd | Extraterritorial | 2025 |
| Kreate Performing Arts Ltd | Education | 2019 |
| Kreatives Talk CIC | Other services | 2021 |
| Kreed UK Ltd | Wholesale & retail | 2018 |
| Kreod Architecture Ltd | Professional & scientific | 2011 |
| Kreod ISS Ltd | Professional & scientific | 2015 |
| Kreod Ltd | Construction | 2012 |
| Kreussler and Company Limited | Wholesale & retail | 1976 |
| Krib Associates Ltd. | Professional & scientific | 1998 |
| Krispy Kleen Ltd | Administrative & support | 2019 |
| Kristina Taylor Interiors Limited | Professional & scientific | 2024 |
| KRT Maintenance Ltd | Energy | 2020 |
| Krueger House (Shortlands) RTM Company Limited | Real estate | 2016 |
| KS Active Futures CIC | Education | 2025 |
| KS Property Service Group Ltd | Real estate | 2025 |
| Ksjk Limited | Transport & logistics | 2019 |
| KSM Project Management & Consultancy Limited | Construction | 2016 |
| Ksonahomes Ltd | Real estate | 2021 |
| Ktdm Services Ltd | Transport & logistics | 2025 |
| Kubenso Ltd | Wholesale & retail | 2015 |
| Kuho Ltd | Construction | 2025 |
| Kulco Ltd | Administrative & support | 2021 |
| Kuljai Beauty Ltd | Other services | 2014 |
| Kung Ukeig | | 2009 |
| Kupa Estates Ltd | Real estate | 2024 |
| Kurst Studios Ltd | Professional & scientific | 2022 |
| Kurucesme Ltd | Extraterritorial | 2025 |
| Kuruma Solutions Limited | Administrative & support | 2020 |
| Kushd Limited | Health & social care | 2024 |
| Kusoco Ltd | Wholesale & retail | 2021 |
| Kussing Couture Ltd | Manufacturing | 2022 |
| Kutza Ltd | Professional & scientific | 2025 |
| Kuube.Uk Ltd | Wholesale & retail | 2024 |
| Kuzey Yacht Ltd | Wholesale & retail | 2024 |
| KV Sports Ltd | Wholesale & retail | 2023 |
| KVB Properties Limited | Financial services | 2019 |
| Kwakyeco Limited | Public administration | 2026 |
| Kwamz Door to Door Limited | Transport & logistics | 2022 |
| Kweb Capital Limited | Administrative & support | 2016 |
| Kwei Stober Consulting Limited | Administrative & support | 2011 |
| KWM Properties Investment Limited | Real estate | 2025 |
| Kwofs Consults Ltd | Construction | 2021 |
| Kyle Rossiter Ltd | Information & communication | 2019 |
| Kyon Limited | Manufacturing | 2020 |
| L R B Construction Ltd | Construction | 2018 |
| L & V Decorators Ltd | Construction | 2011 |
| L Brogden Ltd | Administrative & support | 2024 |
| L Dicker Ltd | Information & communication | 2019 |
| L H Legal Services London Limited | Administrative & support | 2009 |
| L I & M Group Limited | Construction | 2024 |
| L Livings Property Relocation Ltd | Real estate | 2018 |
| L Livings Property Services Limited | Real estate | 2016 |
| L P Curran Decorators Ltd | Construction | 2024 |
| L R S Business Services Ltd | Professional & scientific | 2014 |
| L R-Smith Ltd | Administrative & support | 2017 |
| L W F Travelwise Limited | Transport & logistics | 2018 |
| L&A Agency Services Limited | Professional & scientific | 1991 |
| L&A Fortanle Ltd | Real estate | 2025 |
| L&M Rendering Ltd | Construction | 2016 |
| L&S Ventures Ltd | Education | 2020 |
| L'Italia NEL Bicchiere Limited | Wholesale & retail | 2007 |
| L.E. Pritchitt & Company Limited | Manufacturing | 1983 |
| L.Kahn Manufacturing Company Limited | Real estate | 2023 |
| L2N Consulting Ltd | Information & communication | 2018 |
| L2N Properties Ltd | Real estate | 2024 |
| L2N Trading Ltd | Financial services | 2024 |
| L3 Training Limited | Education | 2021 |
| LA Art & Craft Ltd | Wholesale & retail | 2026 |
| LA Belle Epoch Ltd | Wholesale & retail | 2018 |
| LA Bomba Builders Ltd | Construction | 2024 |
| LA Eagle Ltd | Other services | 2018 |
| LA Perfection DE LA Perfection Ltd | Wholesale & retail | 2018 |
| LA Personal Products Ltd | Wholesale & retail | 2016 |
| LA Quinta at LA Manga Club Limited | Hospitality | 2016 |
| LA4 Ltd | Construction | 2018 |
| Labella London Ltd | Other services | 2020 |
| LAC Bromley Limited | Information & communication | 2025 |