| Laus Food Ltd | Wholesale & retail | 2018 |
| Lavender Sweep Properties Ltd. | Real estate | 2000 |
| Lawson Estate Agents Limited | Transport & logistics | 2022 |
| Lawson Rose Ltd | Information & communication | 2021 |
| Lawton Consulting Ltd | Professional & scientific | 2014 |
| Laxmi and Sisters Ltd | Hospitality | 2017 |
| Layla Innovations Ltd | Professional & scientific | 2023 |
| Layla Julia Maysa Ltd | Wholesale & retail | 2026 |
| Lazerbeam Fire & Security Ltd | Other services | 2013 |
| LBV Housing Ltd | Real estate | 2019 |
| LC Window Cleaning Ltd | Administrative & support | 2024 |
| LCT Technical Ltd | Arts & recreation | 2026 |
| LDS Surrey Properties Ltd | Households | 2018 |
| LE Benj Geopressure Limited | Professional & scientific | 2020 |
| LE Operations Ltd | Professional & scientific | 2022 |
| Leading Place Limited | Professional & scientific | 2018 |
| Leanne Gorin Ltd | Professional & scientific | 2025 |
| Learent Limited | Financial services | 2023 |
| Learning Success Limited | Administrative & support | 2006 |
| Learning VIA Ltd | Education | 2012 |
| Leaveit Sparking Ltd | Administrative & support | 2026 |
| LEE & Bell Developments Ltd | Real estate | 2025 |
| LEE Allen Creative Ltd | Professional & scientific | 2025 |
| LEE Hawkins Coach Mentor Consult Limited | Professional & scientific | 2019 |
| LEE Mccarthy Electrical Services Limited | Construction | 2012 |
| Legendary Studios Ltd | Information & communication | 2025 |
| Lehxa Ltd | Professional & scientific | 2022 |
| Lekarek Ltd | Wholesale & retail | 2024 |
| Lemongrass Green Limited | Professional & scientific | 2009 |
| Lenis OGT Limited | Wholesale & retail | 2026 |
| LEO Food and Cafe Ltd | Hospitality | 2020 |
| Leomayn Limited | Professional & scientific | 2025 |
| Leonart Design and Build Ltd | Construction | 2019 |
| Leostone Ltd | Wholesale & retail | 2019 |
| Lesley LEE Limited | Information & communication | 2011 |
| Leto & Home Ltd | Wholesale & retail | 2021 |
| Leton Property Limited | Construction | 2021 |
| Lettings Solutions Ltd | Households | 2024 |
| Letunova Ltd | Administrative & support | 2024 |
| Leverett Electrical Limited | Construction | 2005 |
| Lewis Media Ltd | Information & communication | 2025 |
| Lewisford Construction Ltd | Construction | 2009 |
| Lewisford Equipment Solutions Limited | Manufacturing | 2022 |
| LG Progress Ltd | Professional & scientific | 2023 |
| LHE Freehold Limited | Households | 2017 |
| Liberty Adventure Holdings Ltd | Financial services | 2021 |
| Liblane Properties Ltd | Real estate | 2023 |
| Libra Literary Agency Ltd | Professional & scientific | 2021 |
| Lida Cake Limited | Wholesale & retail | 2025 |
| Lidl Great Britain Limited | Wholesale & retail | 1993 |
| Lidl UK Trading Limited | Wholesale & retail | 2019 |
| Lifecreatorzz Ltd | Financial services | 2022 |
| Lifetime Shutters UK Limited | Professional & scientific | 2020 |
| Light Synthesis Limited | Administrative & support | 2013 |
| Lighthouse (Southern) Ltd | Construction | 2018 |
| Lighthouse Games Studio Ltd | Information & communication | 2017 |
| Lighting Zone Limited | Manufacturing | 2006 |
| Lilanet Ltd | Information & communication | 2019 |
| Lilly C Rose & Co Ltd | Wholesale & retail | 2022 |
| Lillys International Limited | Wholesale & retail | 2023 |
| Limen Limited | Professional & scientific | 2012 |
| Linda Cottee Flowers Limited | Administrative & support | 2009 |
| Linda Stevenson Limited | Health & social care | 2010 |
| Lindley Court (Hampton Wick) Residents Association Limited | Households | 1967 |
| Line IQ Ltd | Information & communication | 2025 |
| Line Ryder Limited | Other services | 2010 |
| Ling Dynamics Ltd | Wholesale & retail | 2015 |
| Lingam Courier Limited | Transport & logistics | 2020 |
| Lingam Transport Limited | Other services | 2017 |
| Lintel and Arch Ltd | Professional & scientific | 2020 |
| Lion Fire UK Limited | Public administration | 2025 |
| Liquidamber Ltd. | Other services | 2007 |
| Lissant Close (Surbiton) Management Limited | Households | 2000 |
| Lisskiss Limited | Wholesale & retail | 2013 |
| Lithium M & E Limited | Construction | 2023 |
| Litigation Support Services Ltd | Professional & scientific | 2010 |
| Little Copper Washer Ltd | Manufacturing | 2021 |
| Little Lost Soles Ltd | Wholesale & retail | 2025 |
| Liva Corporation Limited | Wholesale & retail | 2025 |
| Live Projects Limited | Professional & scientific | 2015 |
| Live Venture Group Limited | Arts & recreation | 2025 |
| Live Your Worth Ltd | Health & social care | 2022 |
| Liverbird Investments Limited | Financial services | 2025 |
| Livin Construction Limited | Construction | 2011 |
| LIZ Cooper-Borthwick LCB Consulting Limited | Professional & scientific | 2016 |
| Lizo Ltd | Wholesale & retail | 2023 |
| LJ Antiques Limited | Wholesale & retail | 2016 |
| LJ Treasury Services Limited | Professional & scientific | 2019 |
| LKS Makeup Ltd | Other services | 2026 |
| Lloyds Kingston Ltd | Wholesale & retail | 2025 |
| LMM Media Ltd | Information & communication | 2013 |
| LMX Productions Ltd | Information & communication | 2019 |
| LND Fine Foods Ltd | Hospitality | 2025 |
| Load Consulting Ltd | Professional & scientific | 2023 |
| Lockesley Square (Surbiton) Residents Association Limited | Households | 1972 |
| Logd Ltd | Information & communication | 2021 |
| Londoma Ltd | Professional & scientific | 2024 |
| Londomex Ltd | Professional & scientific | 2024 |
| London Accountancy & Law Firm Limited | Professional & scientific | 2023 |
| London and North Eastern Railway (L.N.E.R.) Limited | Transport & logistics | 1996 |