| Leghari Limited | Information & communication | 2013 |
| Legistics Limited | Administrative & support | 2009 |
| Leigh Apple Group Community Interest Company | Education | 2020 |
| Leith Hill Brewery Limited | Manufacturing | 2022 |
| Lemons Consulting Group Ltd | Administrative & support | 2021 |
| Lenna Limited | Professional & scientific | 2010 |
| Lennox Hamilton Limited | Professional & scientific | 2006 |
| Lenziq Technologies Limited | Administrative & support | 2025 |
| Lerfm Limited | Real estate | 2014 |
| LES Enfants Terribles Theatre Company Limited | Arts & recreation | 2008 |
| LES Petits Theatre Limited | Arts & recreation | 2013 |
| LET Easy Limited | Administrative & support | 2006 |
| Lewis Charles (Oxted) Limited | Wholesale & retail | 2017 |
| Lewis Jackson Ventures Ltd | Information & communication | 2023 |
| Lewisham Cepn Limited | Education | 2016 |
| LF Holdings (1) Limited | Financial services | 2020 |
| LGM International Limited | Real estate | 2006 |
| Lhapc Ltd | Health & social care | 2020 |
| Liberty Contracts South East Limited | Other services | 2019 |
| Lichen Court Limited | Real estate | 1985 |
| Lickfold Inn Limited | Hospitality | 2014 |
| Life After ME UK Ltd | Information & communication | 2023 |
| Light Innovation Limited | Wholesale & retail | 1991 |
| Lightshop Films Limited | Information & communication | 1998 |
| Limelight Scaffolding Limited | Construction | 2025 |
| Limelight Services (South East) Limited | Construction | 2023 |
| Liminal Advisory Ltd | Professional & scientific | 2026 |
| Limpio Managed Services Limited | Wholesale & retail | 2012 |
| Linden House Management Company Limited | Households | 1982 |
| Lindenmeyr International Ltd. | Wholesale & retail | 1956 |
| Lindner Prater Limited | Construction | 2006 |
| Lindner UK Holdings Limited | Financial services | 2021 |
| Lindo Anaesthesia LLP | | 2008 |
| Lindsay Court Management Limited | Real estate | 1971 |
| Link Capital (UK) Ltd | Financial services | 2014 |
| Linkfield Data Capture Limited | Construction | 2006 |
| LINQUANFA333 Ltd | Hospitality | 2025 |
| Litillo Creations Ltd | Arts & recreation | 2023 |
| Littera Scripta Translations Ltd. | Professional & scientific | 2016 |
| Little Golfers Limited | Arts & recreation | 2009 |
| Little Green Vibes Ltd | Wholesale & retail | 2021 |
| Little Gwyns Limited | Wholesale & retail | 2026 |
| Littleton Grange RTM Company Ltd | Households | 2016 |
| Live Circle UK Services Ltd | Construction | 2015 |
| Live Edit Ltd | Information & communication | 2019 |
| Living With ABI Ltd | Health & social care | 2023 |
| Livingo Stays Ltd | Administrative & support | 2022 |
| LJ Pryor Limited | Professional & scientific | 2016 |
| LJ Pryor Vehicles Limited | Administrative & support | 2016 |
| LL Square Ltd | Arts & recreation | 2022 |
| LM Pensions Ltd | Financial services | 2018 |
| LMC Enterprises Limited | Information & communication | 2009 |
| Lmea Limited | Financial services | 2011 |
| Lmeq Limited | Arts & recreation | 2003 |
| Location Audio Limited | Information & communication | 2013 |
| Lochplace Holdings Limited | Real estate | 1997 |
| Lochplace Limited | Construction | 1996 |
| Logistikelly Limited | Administrative & support | 2019 |
| London Carnival Funfairs Limited | Arts & recreation | 2013 |
| London Commercial Properties Limited | Construction | 1979 |
| London Event Studios Limited | Administrative & support | 2019 |
| London Fire Engineering Limited | Administrative & support | 2021 |
| London Investment Holdings Limited | Construction | 1979 |
| London Metropolitan Orchestra Limited | Arts & recreation | 1994 |
| London Yida Ltd | Transport & logistics | 2019 |
| Lonely ANT Ltd | Wholesale & retail | 2022 |
| Longacre Communications Limited | Information & communication | 2019 |
| Longhouse (Edenbridge) Ltd | Hospitality | 2014 |
| Louie Paske Carpentry Ltd | Manufacturing | 2021 |
| Loumar Property Services Ltd. | Administrative & support | 2009 |
| Lovehair & Co Limited | Other services | 2011 |
| Lovering Foods Limited | Wholesale & retail | 2005 |
| Lovering Group Limited | Wholesale & retail | 2002 |
| Loveworks.Org Limited | Health & social care | 2008 |
| Loxwood Capital Europe Limited | Real estate | 2019 |
| LS Heating and Plumbing Ltd | Construction | 2020 |
| LSA Search International Limited | Administrative & support | 2002 |
| Lsod Auto Parts UK Ltd | Wholesale & retail | 2024 |
| Lsp-Design Studio Ltd | Professional & scientific | 2022 |
| Lucas Design & Construction Limited | Real estate | 2007 |
| Lucas Employment Services Limited | Administrative & support | 2018 |
| Lucas Land UK Ltd | Real estate | 2017 |
| Lucas More 8 Limited | Construction | 2019 |
| Lucas More Limited | Real estate | 2018 |
| Lucas More Seven Limited | Real estate | 2018 |
| Lucky Kitchen Walderslade Ltd | Hospitality | 2026 |
| Lucky With NIC Ltd | Wholesale & retail | 2025 |
| Luminis Reigate Limited | Wholesale & retail | 2018 |
| Luminis Workforce Solutions Limited | Administrative & support | 2025 |
| Lummeo Limited | Professional & scientific | 2025 |
| Luna OWL Limited | Other services | 2018 |
| Lunar Star Limited | Health & social care | 2020 |
| Lush and Lambert Ltd | Hospitality | 2024 |
| Luxury Adventures Ltd | Administrative & support | 2017 |
| Luxury Interior Concepts Limited | Professional & scientific | 2017 |
| Luxury Sprinters UK Limited | Transport & logistics | 2025 |
| Luxury Train Hub Ltd | Information & communication | 2026 |
| Luxx Cabs Limited | Transport & logistics | 2024 |
| Lydia Elise Production Ltd | Professional & scientific | 2026 |
| Lymphatic Obsessed 2 Ltd | Health & social care | 2026 |