| Komfort Logistics Limited | Transport & logistics | 2008 |
| Komfort Services Ltd | Administrative & support | 2005 |
| Konsalt Limited | Administrative & support | 2007 |
| KOP Services Limited | Professional & scientific | 2001 |
| Korean Media Consulting Ltd | Information & communication | 2021 |
| Kovendi Limited | Administrative & support | 2019 |
| KP Sales Limited | Other services | 1990 |
| KPH Group EOT Trustees Limited | Financial services | 2022 |
| KPK 3 Properties Ltd | Real estate | 2020 |
| KR Diagnostics Ltd | Health & social care | 2024 |
| Kraft Ltd | Administrative & support | 2000 |
| KRB Building Services Limited | Construction | 2003 |
| Kris KIM Sports Ltd | Arts & recreation | 2026 |
| Kris-Ko Ltd | Transport & logistics | 2014 |
| Krishen Mooneeram Limited | Other services | 2021 |
| Kroft Properties Ltd | Real estate | 2024 |
| KSB Electrical Services Ltd | Construction | 2006 |
| KSC Investments Limited | Real estate | 2004 |
| KSE Healthcare Limited | Other services | 2023 |
| KSM Properties Limited | Real estate | 1997 |
| KT Garages Ltd | Real estate | 2026 |
| KT GAS Ltd | Construction | 2014 |
| KTV Properties Ltd | Real estate | 2026 |
| Kudy Ltd | Administrative & support | 2018 |
| Kuma Environmental Design Limited | Professional & scientific | 1991 |
| Kumco Limited | Extraterritorial | 1996 |
| KW Repairs Limited | Wholesale & retail | 2004 |
| Kwin D LLP | | 2024 |
| Kybert Carroll Limited | Professional & scientific | 2006 |
| L & C Company Secretarial Limited | Extraterritorial | 2005 |
| L B C (London) Limited | | 1987 |
| L R Properties Limited | Real estate | 2006 |
| L R Selvey & Co Limited | Professional & scientific | 2005 |
| L W Burrows & SON Limited | Construction | 2003 |
| L&C Solutions for Business Ltd | Administrative & support | 2000 |
| L&S Murphy Limited | Construction | 2007 |
| L&S Perena Voice Healthcare Limited | Health & social care | 2014 |
| L'Assaggino Kingston Limited | Wholesale & retail | 2007 |
| L.A. Design Company Limited | Wholesale & retail | 1987 |
| L.B. Demolition and Haulage Company Limited | Water & waste | 1973 |
| L.H.Development Co,Limited | Real estate | 1955 |
| L.H.Investments,Limited | Real estate | 1958 |
| L.H.Ransom,Limited | Real estate | 1959 |
| L.M.J. Property Management Limited | Real estate | 1992 |
| Laarni Limited | Real estate | 2024 |
| Ladymead Projects Limited | Professional & scientific | 1992 |
| Ladythorpe Close Estates Limited | Administrative & support | 2019 |
| LAE Car Sales Ltd | Wholesale & retail | 2025 |
| Lainford Butchers (Camberley) Limited | Wholesale & retail | 2008 |
| Lake Bros Ltd | Construction | 2006 |
| Lakemond Limited | | 1989 |
| Lakepark Limited | Hospitality | 1991 |
| Laksmn UK Limited | Real estate | 2007 |
| Lal-Akash Restaurants Limited | Hospitality | 2001 |
| Lala of London Limited | Wholesale & retail | 2011 |
| Laleham Homes Limited | Construction | 2015 |
| Lamb Direct Consulting Limited | Administrative & support | 2007 |
| Lamba Motorcycles Ltd | Wholesale & retail | 1970 |
| Lambart Limited | Construction | 2002 |
| Lambda Consulting Limited | Professional & scientific | 2006 |
| Lampmoors Limited | | 1983 |
| Lanatech Consultants Limited | Manufacturing | 1997 |
| Lancefield Management Company Limited | Households | 2005 |
| Lancula Limited | Health & social care | 2011 |
| Land Hunters LLP | | 2006 |
| Landcrest Limited | Real estate | 1992 |
| Landmark Leasing Limited | Real estate | 2021 |
| Landmark Retail Limited | Wholesale & retail | 2021 |
| Langshott Farms Ltd | Extraterritorial | 1997 |
| Lanista Partners Limited | Information & communication | 2002 |
| Lannds Ltd | Other services | 2016 |
| Lapper Consulting Limited | Arts & recreation | 2005 |
| Lark Property Management LLP | | 2023 |
| Larkfield Road Management Company Limited | Households | 1997 |
| Larkhill Consultancy Ltd | Professional & scientific | 2005 |
| Larkhill General Stores Limited | Wholesale & retail | 2006 |
| Larkin Associates Limited | Construction | 2003 |
| Larkstore Limited | Wholesale & retail | 1980 |
| LAS Social Care Limited | Health & social care | 2015 |
| Lasercode I.T. Limited | Information & communication | 1997 |
| Laserdie Limited | Manufacturing | 2007 |
| Lasermeasured Limited | Professional & scientific | 2006 |
| Lateral Thought Ltd | Information & communication | 2007 |
| Latimer Estate Agents Limited | Real estate | 2006 |
| Laura Church Consulting Limited | Households | 2004 |
| Lavershot Hall Management Limited | Households | 1965 |
| Lawler Engineering Limited | Administrative & support | 1965 |
| Lawman Court (KEW) Limited | Households | 2001 |
| Lawson Recruitment Limited | Administrative & support | 2010 |
| LDF Management Services Ltd | Hospitality | 2009 |
| LDN Engineering and Constructions Ltd | Construction | 2023 |
| LEA RD Farnham Ltd | Real estate | 2021 |
| Leader Specialist Components Limited | Administrative & support | 1986 |
| Leader Specialist Holdings Limited | Professional & scientific | 2004 |
| Leapfrog Properties Europe Limited | Real estate | 2005 |
| Learning Culcha Ltd | Professional & scientific | 2025 |
| Learnux Limited | Information & communication | 2006 |
| Leas Construction Limited | Construction | 2007 |
| Leather & Grindery Supplies Limited | Wholesale & retail | 1950 |
| Leatherhead Glass Limited | Construction | 1995 |