| KBR Employment Services Limited | Administrative & support | 2013 |
| KCC Motors Ltd | Wholesale & retail | 2025 |
| KCV Developments Limited | Professional & scientific | 2021 |
| KDS Digital Ltd | Professional & scientific | 2017 |
| Kedler Consulting Limited | Information & communication | 2007 |
| Keep Sailing Limited | Arts & recreation | 2020 |
| Keith Weed Limited | Professional & scientific | 2019 |
| Kellogg Brown & Root (Greenford) Limited | Professional & scientific | 1967 |
| Kellogg Brown & Root (Services) Limited | Financial services | 1975 |
| Kellogg Brown & Root (U.K.) Limited | Construction | 1986 |
| Kellogg Brown & Root Group Limited | Financial services | 2009 |
| Kellogg Brown & Root Healthcare Trustee Limited | Extraterritorial | 2004 |
| Kellogg Brown & Root Holdings (U.K.) Limited | Financial services | 1984 |
| Kellogg Brown & Root International (MWK) Limited | Professional & scientific | 1984 |
| Kellogg Brown & Root International Group Limited | Financial services | 2009 |
| Kellogg Brown & Root Investment Holdings Limited | Financial services | 2009 |
| Kellogg Brown & Root Limited | Professional & scientific | 1959 |
| Kellogg Brown & Root Overseas Projects Limited | Professional & scientific | 1986 |
| Kellogg Brown & Root Projects Limited | Professional & scientific | 1984 |
| Kellogg Brown & Root Solutions Limited | Mining & quarrying | 1986 |
| Kelvic Petal Associates Limited | Manufacturing | 2006 |
| Kennis Europe Limited | Transport & logistics | 2026 |
| Kersfield Maintenance Limited | Real estate | 1960 |
| Keswick Gardens Residents Association Limited | Households | 1981 |
| Keyfactors Emblemco Ltd | Wholesale & retail | 2012 |
| KF One Consultancy Limited | Information & communication | 2013 |
| KH Bookkeeping Services Limited | Professional & scientific | 2022 |
| KH Consulting Solutions Ltd | Information & communication | 2021 |
| Kiln Coffee Ltd | Manufacturing | 2026 |
| KIM Media Services Limited | Professional & scientific | 2026 |
| Kingfisher Analytics Ltd | Information & communication | 2021 |
| Kingfisher Court Management Company Limited | Households | 1989 |
| Kingsman Media and Marketing Ltd | Extraterritorial | 2018 |
| Kingston Finance Ltd | Financial services | 2022 |
| Kinstone Original Limited | Wholesale & retail | 2025 |
| Kirei Home Limited | Wholesale & retail | 2017 |
| Kirkham Lodge Limited | Real estate | 2009 |
| Kissesx Ltd | Manufacturing | 2021 |
| KIT Form Services Ltd | Manufacturing | 2022 |
| Kitchen Pods Surrey Ltd | Administrative & support | 2026 |
| Kiva Trading Ltd | Professional & scientific | 2009 |
| Kiwi Voice and Data Ltd | Administrative & support | 2022 |
| KJ Tech Limited | Construction | 2009 |
| Klass Chauffeur Ltd | Transport & logistics | 2025 |
| Klepping Consulting Limited | Professional & scientific | 2021 |
| KLG Organiser & Stylist Ltd | Other services | 2026 |
| KM Effects Holding Limited | Real estate | 2026 |
| KM Effects Limited | Information & communication | 2007 |
| KMK Automotive Limited | Wholesale & retail | 2018 |
| KN Finance Limited | Administrative & support | 2008 |
| Knott Park Residents Association Limited | Other services | 2001 |
| Knut Limited | Professional & scientific | 2023 |
| Kobi Mates Transport Ltd | Transport & logistics | 2024 |
| Kolaris Design Ltd | Professional & scientific | 2015 |
| Koley Limited | Real estate | 2011 |
| Konnie Medicals Limited | Health & social care | 2019 |
| Koru Wellness Ltd | Professional & scientific | 2020 |
| KPR Property Maintenance Ltd | Construction | 2020 |
| Kronen Limited | Professional & scientific | 2013 |
| KT Consult Limited | Professional & scientific | 2022 |
| KT22 Ltd | Education | 2022 |
| Ktrak Ltd | Administrative & support | 2021 |
| Kudos Bodyworks Ltd | Wholesale & retail | 2016 |
| Kurrajong Investments Limited | Administrative & support | 2020 |
| KVD Group Ltd | Administrative & support | 2016 |
| KZL Investment Ltd | Real estate | 2018 |
| L Clinton Property Management Company Ltd | Real estate | 2013 |
| L-Evate Limited | Professional & scientific | 2016 |
| L.Hawkins & Sons Limited | Other services | 1960 |
| LA Belle Rose Ltd | Wholesale & retail | 2015 |
| Lacock Limited | Real estate | 2025 |
| Laidan Vision Limited | Health & social care | 2025 |
| Laks Shaan Ltd | Wholesale & retail | 2021 |
| Lamaron Limited | Wholesale & retail | 2024 |
| Lambs END Management Limited | Households | 1997 |
| Lamsa Limited | Wholesale & retail | 2026 |
| Lancaster Place (Wimbledon) Residents Association Limited | Households | 1977 |
| Lancing Development Co Limited | Construction | 2021 |
| Lancre Development Company Limited | Construction | 2017 |
| Land Cars Ltd | Wholesale & retail | 2022 |
| Land Rights Acquisition Ltd | Real estate | 2026 |
| Land Search South East Limited | Real estate | 2003 |
| Landall Services Limited | Information & communication | 2016 |
| Landbak Limited | Water & waste | 1996 |
| Landway Construction Limited | Administrative & support | 2005 |
| Langdon Park Residents Company Limited | Real estate | 2010 |
| Langham Road Blakeney Management Company Limited | Households | 2013 |
| Langston Resources Limited | Professional & scientific | 1999 |
| Larch Crescent (Ewell) Freehold Company Limited | Households | 1993 |
| Larch Crescent (Ewell) Management Company Limited | Households | 1970 |
| Large Parasols Limited | Professional & scientific | 2009 |
| Latte Lettings Ltd | Real estate | 2020 |
| Laurel Gordon Investments Limited | Real estate | 2006 |
| Laurel Gordon Properties Limited | Real estate | 1959 |
| Laurie Associates Limited | Professional & scientific | 2021 |
| Lavanzey Global Trading Ltd | Wholesale & retail | 2023 |
| Lavender Cafe Ltd | Hospitality | 2024 |
| Lavender Catering and Events Ltd | Hospitality | 2022 |
| Lavender Catering Group Ltd | Hospitality | 2022 |
| Lavender Catering Limited | Hospitality | 2019 |