| KRV Newgentech Limited | Information & communication | 2022 |
| Krystel Services Limited | Wholesale & retail | 2023 |
| Ks-Az Limited | Real estate | 2022 |
| KT Drive Limited | Other services | 2018 |
| KT Real Estate Limited | Real estate | 2020 |
| KT17 Limited | Real estate | 2016 |
| Ktitika Consultancy Limited | Professional & scientific | 2025 |
| Ktsf Limited | Other services | 2012 |
| Kuci Gardens Ltd | Construction | 2024 |
| Kudu Motorcycle Tours Ltd | Administrative & support | 2025 |
| Kugan Consulting Limited | Professional & scientific | 2018 |
| Kunlewax Ltd | Public administration | 2022 |
| Kunoichi Ltd | Manufacturing | 2017 |
| KV Consult Ltd. | Other services | 2011 |
| KWL Family Investments Limited | Real estate | 2024 |
| KWS Holdings Limited | Financial services | 2022 |
| Kyclos Engineering Consulting & Partner Limited | Manufacturing | 2023 |
| KZ Cost Consulting Limited | Professional & scientific | 2012 |
| L & F Accounting Ltd | Professional & scientific | 2011 |
| L G Building & Design Limited | Construction | 2007 |
| L GAN Limited | Health & social care | 2014 |
| L K & G Group Limited | Wholesale & retail | 2017 |
| L Khan Marketing Ltd | Professional & scientific | 2026 |
| L M Finance (UK) Limited | Financial services | 2005 |
| L Scott Limited | Construction | 2015 |
| L&B Capital Limited | Administrative & support | 2025 |
| L&Nk Properties Limited | Real estate | 2020 |
| L&S Caterers (Holdings) Ltd | Hospitality | 2019 |
| L&S Caterers (I) Ltd | Hospitality | 2021 |
| L. C. I. Site Services (Surrey) Limited | Wholesale & retail | 2013 |
| L.A Building Ltd | Construction | 2024 |
| L.A.J. Pearce Surfacing Ltd | Construction | 2016 |
| L.L. Penwarden Haulage Ltd | Transport & logistics | 2019 |
| LA Bottega DEL Pane Limited | Manufacturing | 2004 |
| LA Manga by Design Limited | Administrative & support | 1994 |
| LAB Group Ltd | Wholesale & retail | 2016 |
| Laboratory Efficiency and Design Solutions Ltd | Professional & scientific | 2018 |
| Laburnum Ventures Limited | Construction | 2012 |
| Ladas Property Ltd | Real estate | 2023 |
| Ladas Property Management Ltd | Real estate | 2023 |
| Lady Jane Court Management Company Limited | Households | 2001 |
| Lagoon Pools Construction Limited | Construction | 2021 |
| Lagoon Pools Limited | Construction | 2003 |
| Lagoon Pools Servicing and Maintenance Ltd | Construction | 2020 |
| LAL Phone and Vape Ltd | Wholesale & retail | 2024 |
| Lalinda UK Ltd | Hospitality | 2019 |
| Lalinda Wimbledon Ltd | Hospitality | 2019 |
| Lalji Property Ltd | Real estate | 2024 |
| Lambo Consultancy Limited | Financial services | 2024 |
| Lami Accountancy Ltd. | Professional & scientific | 2015 |
| Lami Building & Decorating Services Ltd | Construction | 2021 |
| Lancaster Scott & Co. Limited | Real estate | 1939 |
| Lancaster Scott Estates Limited | Financial services | 2017 |
| Lancasters Estate Agents Limited | Real estate | 1988 |
| Lancasters Limited | Professional & scientific | 1988 |
| Land Click Ltd | Construction | 2018 |
| Land Management Holdings Limited | Financial services | 2021 |
| Landeconreal Estate Investment Management Limited | Real estate | 2026 |
| Landlord Matters Ltd | Real estate | 2019 |
| Landmark (GC) Ltd | Real estate | 2026 |
| Landmark Nova Limited | Professional & scientific | 2025 |
| Landrich Property Services Limited | Construction | 2012 |
| Lands LUO Ltd | Wholesale & retail | 2018 |
| Lane Entertainments Ltd | Arts & recreation | 2023 |
| Lanesmere Limited | Households | 1992 |
| Laney Noon Limited | Hospitality | 2018 |
| Langdale Interiors Limited | Professional & scientific | 2021 |
| Langham House Management (Worcester Park) Limited | Households | 1966 |
| Langley Group Limited | Real estate | 2023 |
| Langley Park Foods Limited | Wholesale & retail | 1997 |
| Langton Apartments Ltd | Real estate | 2016 |
| Lanka Properties (UK) Ltd | Real estate | 2003 |
| Lanka Property Services Limited | Construction | 2003 |
| Lanres Limited | Real estate | 1988 |
| Lanz Holdings Limited | Financial services | 2020 |
| LAP Record Limited | Professional & scientific | 2025 |
| Larchwood Lettings Limited | Real estate | 2023 |
| Larlees Holdings Limited | Financial services | 2020 |
| Last Ping Ltd | Information & communication | 2026 |
| Lasting Impressions Studio CIC | Professional & scientific | 2026 |
| Lateral Energy Advisors Ltd | Professional & scientific | 2018 |
| Laucon Ltd | Wholesale & retail | 2021 |
| Laura @ Snippety DO Dahs Limited | Other services | 2016 |
| Laurence Court Management Co. Limited | Households | 1997 |
| Lavandou Yard Residents Association Limited | Households | 2012 |
| Lavender & Lemon Ltd. | Administrative & support | 2021 |
| Lavender Court (Sutton) RTM Company Ltd | Households | 2011 |
| Lavender Lodge Management Company (Ewell) Limited | Hospitality | 1999 |
| Lavender Productions Ltd | Arts & recreation | 2021 |
| Lawless Limited | Professional & scientific | 2011 |
| Lax-Pericall Child and Adolescent Psychiatry Ltd | Health & social care | 2012 |
| Laxtons (UK2) Limited | Transport & logistics | 2002 |
| LAY Weigh Limited | Manufacturing | 2025 |
| Lazarus Productions Limited | Information & communication | 2018 |
| LBP Bullion Ltd | Wholesale & retail | 2026 |
| LC Closing Ltd | Professional & scientific | 2025 |
| LCD Car Sales Limited | Wholesale & retail | 2017 |
| LCF Inc Limited | Wholesale & retail | 2023 |
| LCI Property Management Limited | Households | 2019 |
| LCS Electrical Services Ltd | Construction | 2021 |