| Lahwita Limited | Professional & scientific | 2012 |
| Lallapolosa Baking Company Ltd | Hospitality | 2011 |
| Lamassure Limited | Professional & scientific | 2025 |
| Lamion Ltd | Wholesale & retail | 2025 |
| Landmark Worldwide UK Limited | Administrative & support | 2009 |
| Lane One Graphics Ltd | Professional & scientific | 2023 |
| Langhurst Copse Management Company Limited | Professional & scientific | 2014 |
| Langley Fish & Chips Limited | Hospitality | 2001 |
| Lanherne House RTM Company Limited | Administrative & support | 2011 |
| Lansbury& Logan Pet Services Limited | Other services | 2018 |
| LAR Activities Ltd | Financial services | 2025 |
| LAR Electrical Contractors Ltd | Construction | 2021 |
| LAR Property Investments Ltd | Real estate | 2025 |
| Larch Close Ltd | Real estate | 2023 |
| Larochelle Investment Limited | Real estate | 2007 |
| Lars Shlars Limited | Real estate | 2025 |
| LAS Sitas Limited | Professional & scientific | 2025 |
| Latchmere Academy Trust | Education | 2012 |
| Latchmere Associates Limited | Professional & scientific | 2021 |
| Latchmere Building Services Ltd | Construction | 2018 |
| Latchmere Capital Ltd | Professional & scientific | 2019 |
| Lateral Accounting Ltd | Professional & scientific | 2010 |
| Laterem Group Ltd | Financial services | 2022 |
| Latimer Homes Limited | Real estate | 2022 |
| Latymer Corporation Limited | Wholesale & retail | 2003 |
| Latymer House Limited | Households | 2002 |
| Laura Slader Independent Occupational Therapy Services Limited | Health & social care | 2009 |
| Laurel HR Consulting Ltd | Administrative & support | 2015 |
| Lauren Haythe Acupuncture & Bodywork Limited | Health & social care | 2025 |
| Laurence Cane-Honeysett Limited | Administrative & support | 2013 |
| Laurus Nobilis Medicus Limited | Health & social care | 2023 |
| Lavanderlife Exporting Ltd | Manufacturing | 2025 |
| Lavandou Limited | Professional & scientific | 2009 |
| Lavona Holdings Limited | Households | 2016 |
| Lawreal Ltd | Professional & scientific | 2024 |
| Lawrence Studios Limited | Administrative & support | 2016 |
| Lawson Hill Consulting Ltd | Professional & scientific | 2019 |
| Laycock Properties Limited | Real estate | 2020 |
| Layder Ltd | Professional & scientific | 2022 |
| Laymoun Limited | Real estate | 2022 |
| LCH Mats Ltd | Wholesale & retail | 2026 |
| LCS International Consulting Limited | Professional & scientific | 1999 |
| Lcuk Kingston Limited | Other services | 2019 |
| LD Carpentry London Limited | Manufacturing | 2025 |
| LDE Limited | Real estate | 2022 |
| LDN Industries Ltd | Wholesale & retail | 2023 |
| LE Chahin Ltd | Health & social care | 2022 |
| LE Gang Limited | Professional & scientific | 2017 |
| LE Pôle DE Transition Limited | Education | 2021 |
| Leading Edge Aviation Consultancy Ltd | Professional & scientific | 2025 |
| Leaves and Dreams Limited | Administrative & support | 2025 |
| LED by Reason Ltd | Professional & scientific | 2022 |
| Leds Fusion Services Limited | Information & communication | 2018 |
| Ledzet Properties Limited | Real estate | 2012 |
| LEE Catering Equipment Limited | Wholesale & retail | 2017 |
| LEE Technical Services Limited | Administrative & support | 2004 |
| Lee's Maintenance Ltd | Water & waste | 2024 |
| Left and Right Ltd | Professional & scientific | 2025 |
| Legacy Development Group Ltd | Real estate | 2021 |
| Legacy Distribution Limited | Administrative & support | 1995 |
| Legal Lyons Limited | Professional & scientific | 2016 |
| Legal Times Limited | Professional & scientific | 2013 |
| Legal Women Ltd | Education | 2022 |
| Legallifecycle LLP | | 2016 |
| Legend Mali (UK) I Limited | Administrative & support | 2020 |
| Leica Hunter Group Limited | Wholesale & retail | 2021 |
| Leiser & Ticktin Limited | Information & communication | 2013 |
| Lelas Hair Stylists Limited | Other services | 2021 |
| Lemarchant Consulting Ltd | Professional & scientific | 2018 |
| Lemarchant Holdings Ltd | Financial services | 2023 |
| Lemarchant Properties Ltd | Real estate | 2023 |
| Lend a Hand Services Limited | Administrative & support | 2023 |
| Leodan Productions Ltd | Information & communication | 2024 |
| Leonte Builders UK Ltd | Construction | 2020 |
| Lesla Limited | Professional & scientific | 2014 |
| Lester Burnett Limited | Information & communication | 2007 |
| Lets Belong Ltd | Health & social care | 2019 |
| Lets Learn Nursery Limited | Education | 2011 |
| Leval Trading Limited | Hospitality | 2024 |
| Level Traders Services Limited | Education | 2019 |
| Leven Wharf RTM Company Limited | Households | 2022 |
| Leverage Financial Solutions Limited | Professional & scientific | 2007 |
| Leverage FLO AI Ltd | Professional & scientific | 2024 |
| Levion Ltd | Wholesale & retail | 2020 |
| Lewisford Associates LLP | | 2010 |
| Lexcie Limited | Professional & scientific | 2014 |
| Lexmond UK Ltd | Wholesale & retail | 2021 |
| LG Fulfilment Limited | Transport & logistics | 2018 |
| LIA Holdings Ltd | Real estate | 2025 |
| Lian Properties Limited | Real estate | 2016 |
| Libby JD Ltd | Wholesale & retail | 2026 |
| Liberal Care Ltd | Health & social care | 2024 |
| Liberty Enterprise Consultancy Limited | Professional & scientific | 2007 |
| Liberty Logistics Ltd | Transport & logistics | 2003 |
| Liberty Overseas Limited | Hospitality | 2014 |
| Liberty Park (Wainscott) Management Limited | Households | 2008 |
| Libra Lawyers International Ltd | Financial services | 2024 |
| Lichtvision Design Limited | Professional & scientific | 2015 |
| Life of the Party Ltd | Wholesale & retail | 2021 |
| Lifestyle Management Limited | Administrative & support | 2020 |