| LG Building Solutions Ltd | Construction | 2019 |
| LGD Executive Cars Ltd | Transport & logistics | 2023 |
| LGK Medical Limited | Wholesale & retail | 2025 |
| LH Fashions Ltd | Wholesale & retail | 2024 |
| LH IT Consultancy Solutions Ltd | Information & communication | 2024 |
| LH London Financial Limited | Financial services | 2021 |
| Lhpm Trading Limited | Professional & scientific | 2014 |
| LHT Services Ltd | Financial services | 2019 |
| Liberi Opportunities Limited | Education | 2021 |
| Liberi Rock Investments Ltd | Financial services | 2018 |
| Liberty Arts Ltd | Education | 2022 |
| Liberty Pacific Limited | Professional & scientific | 2014 |
| Libro Sport Ltd | Manufacturing | 2023 |
| Licence Assistance Online Ltd | Information & communication | 2020 |
| Life Planning Ltd | Financial services | 2019 |
| Lifestyle Magazine Group Ltd | Professional & scientific | 2016 |
| Lift Aesthetics Limited | Education | 2021 |
| Light Effects Design Limited | Wholesale & retail | 2014 |
| Light of Life Ltd | Wholesale & retail | 2021 |
| Light Touch Electrical Group Ltd | Construction | 2025 |
| Lightpath IT Ltd | Information & communication | 2006 |
| Liladhar Ltd | Real estate | 2016 |
| Lilian James Limited | Real estate | 2007 |
| Lilkat Trading Limited | Information & communication | 2016 |
| Lilly's Boutique Events Ltd | Wholesale & retail | 2024 |
| Lilly's Boutique London Ltd | Wholesale & retail | 2024 |
| Lilly's Boutique Online Ltd | Wholesale & retail | 2021 |
| Lily Clothing Limited | Wholesale & retail | 1995 |
| Lily Spa Limited | Health & social care | 2018 |
| Limegrove Limited | Education | 2013 |
| Limerick Properties(Cranham)Limited | Other services | 1963 |
| Limeridge Limited | Other services | 2007 |
| Limeridge Property Ltd | Construction | 2025 |
| Limes House Developments Ltd | Construction | 2015 |
| Limetree Close Limited | Real estate | 2004 |
| Limitless Gyms Limited | Extraterritorial | 2020 |
| Lina EL BAZ Limited | Wholesale & retail | 2023 |
| Linaig Limited | Other services | 2014 |
| Lincoln House Consulting Limited | Professional & scientific | 2019 |
| Lindon Trading Limited | Other services | 2026 |
| Lindsay-King Associates LLP | | 2010 |
| Lindy Loos Boutique Ltd | Wholesale & retail | 2022 |
| Line Security Services Ltd | Information & communication | 2018 |
| Lingam Locums Ltd. | Health & social care | 2014 |
| Lingu Ltd | Education | 2014 |
| Link Loans Limited | Financial services | 2008 |
| Linkart Ltd | Manufacturing | 2026 |
| Lintec Testing Services Limited | Professional & scientific | 1997 |
| Linton Capital LLP | | 2004 |
| Lion & Bear Partners Limited | Administrative & support | 2015 |
| Lion Wines Ltd | Wholesale & retail | 2023 |
| Lions ROW Block 1 RTM Company Ltd | Households | 2021 |
| Lions ROW Block 2 RTM Company Ltd | Households | 2021 |
| Lions ROW Block 3 RTM Company Ltd | Households | 2021 |
| Liquid Asset Partners Limited | Wholesale & retail | 2024 |
| Liquorice Wine & Deli Ltd | Wholesale & retail | 2020 |
| Lirro Bespoke Interiors Ltd | Wholesale & retail | 2019 |
| Lirro Limited | Construction | 2004 |
| LIS Lodge Management Co Ltd | Households | 2004 |
| Lisa M Adams Ltd | Arts & recreation | 2017 |
| Lisaben Solutions Ltd | Information & communication | 2014 |
| Little 10 Limited | Wholesale & retail | 2025 |
| Little Amigos Limited | Wholesale & retail | 2018 |
| Little Attic Ltd | Manufacturing | 2020 |
| Little Craft & Co Limited | Wholesale & retail | 2024 |
| Little Ducks Pre-School Ltd | Education | 2024 |
| Little Gems Consulting Limited | Health & social care | 2005 |
| Little Harts Childcare Ltd | Education | 2024 |
| Little Mamma Duck Ltd | Wholesale & retail | 2024 |
| Little Maypole Limited | Real estate | 2016 |
| Little ME Bray Preschool Ltd | Health & social care | 2024 |
| Littleaestheticsx Ltd | Other services | 2025 |
| Live Company Group PLC | Financial services | 1959 |
| Lived Experience Network Ltd | Professional & scientific | 2021 |
| Livewire Building Services Limited | Construction | 1993 |
| Livian Wealth Limited | Professional & scientific | 2025 |
| Livida Sport Limited | Professional & scientific | 2019 |
| Living in Ecstasy Ltd | Administrative & support | 2026 |
| Livvy Locks Ltd | Other services | 2025 |
| Lizzie Bees Ltd | Wholesale & retail | 2020 |
| LJB Building Services (Brentwood) Limited | Construction | 2019 |
| LJC Autospares Ltd | Water & waste | 2006 |
| LJK Vehicle Heritage Limited | Wholesale & retail | 2024 |
| LKK Group Limited | Financial services | 2024 |
| LKK Solution Services Ltd | Construction | 2013 |
| LKS Cleaning Limited | Administrative & support | 2017 |
| Lloyd Philips Ltd | Information & communication | 2020 |
| Lluk Limited | Other services | 2018 |
| Loader Chemicals & Plastics Limited | Wholesale & retail | 1973 |
| Loader Holdings Limited | Construction | 1986 |
| Loadzilla Ltd | Transport & logistics | 2025 |
| Locate I.T. (UK) Limited | Wholesale & retail | 2006 |
| Lock Stock Properties Ltd | Households | 2019 |
| Lockseal Double Glazing Repairs Limited | Construction | 2022 |
| Logde Homes Ltd | Real estate | 2018 |
| Logic Plumbing and Heating Ltd | Construction | 2007 |
| Lollaire Ltd. | Information & communication | 2012 |
| Lomax Healthcare Limited | Professional & scientific | 2003 |
| Lombard Recruitment Ltd | Administrative & support | 2022 |
| London & Docklands Property Services Ltd | Real estate | 2011 |