| Lilyrosely Ltd | Education | 2025 |
| LIM Imports Group Limited | Wholesale & retail | 2025 |
| Lime PI Ltd | Administrative & support | 2018 |
| Lime Residency Limited | Other services | 2021 |
| Limebrook Manor LLP | | 2017 |
| Limesmith Ltd | Construction | 2020 |
| Limetrees Co. Limited | Real estate | 2026 |
| Limrah Business Solutions Limited | Information & communication | 2015 |
| Limrah International Business Solutions Ltd | Financial services | 2024 |
| Linar Private Ltd | Wholesale & retail | 2023 |
| Linchpin Consulting Ltd | Information & communication | 2017 |
| Linda Freeman Limited | Arts & recreation | 2007 |
| Lindemann & Gregory Ltd | Construction | 2026 |
| Linden Management Consulting Ltd | Professional & scientific | 2013 |
| Linear 360 Limited | Real estate | 2014 |
| Linear Productions Ltd | Information & communication | 2021 |
| Lineus Ltd | Wholesale & retail | 2025 |
| Link Interiors Limited | Construction | 2000 |
| Link-Force Building Services Ltd | Construction | 2019 |
| Linkace Consulting Limited | Information & communication | 2001 |
| Linlam Ltd | Hospitality | 2024 |
| Lint Property Limited | Real estate | 2018 |
| Linus Healthcare Ltd | Health & social care | 2019 |
| Lion Brickwork and Scaffolding Limited | Construction | 2017 |
| Lion of Judah Limited Company Limited | Health & social care | 2016 |
| Liquidmai Ltd | Construction | 2019 |
| Lisa Holmes Partnership Ltd | Information & communication | 2015 |
| Lisa Walden Associates Limited | Professional & scientific | 2009 |
| Lisle Road Management Limited | Professional & scientific | 1995 |
| Listed Spaces Limited | Real estate | 2024 |
| Listo Midco Solutions Limited | Financial services | 2018 |
| Listo Solutions Limited | Financial services | 2018 |
| Little & TEW (West END) Limited | Professional & scientific | 1964 |
| Little & TEW Limited | Construction | 1956 |
| Little Biggs Production Ltd | Information & communication | 2016 |
| Little Buddies Day Nursery Ltd | Health & social care | 2014 |
| Little Buddies Preschools Limited | Education | 2015 |
| Little Chalfont Stony Lane Management Company Ltd | Households | 2006 |
| Little Chiltern Co Ltd | Wholesale & retail | 2021 |
| Little Dove Soft Play Ltd | Administrative & support | 2023 |
| Little Eden Nursery Limited | Education | 2024 |
| Little Frog Films Ltd | Information & communication | 2023 |
| Little Peep Nursery Ltd | Health & social care | 2012 |
| Little Stack LLP | | 2013 |
| Little Steps Day Nursery Limited | Health & social care | 2025 |
| Little Strummers Ltd | Education | 2015 |
| Little Weave Limited | Wholesale & retail | 2017 |
| Little Workshop Day Nursery Ltd | Health & social care | 2022 |
| Little's Logistics Ltd | Transport & logistics | 2021 |
| LIV Construction Ltd | Construction | 2016 |
| LIV Equine Ltd | Other services | 2020 |
| Livepipe Limited | Administrative & support | 2018 |
| Livingstones Accountants Limited | Professional & scientific | 2007 |
| Livingstones of London Limited | Financial services | 1994 |
| Livingztyle.Com Limited | Wholesale & retail | 2019 |
| Livowen Limited | Other services | 2015 |
| Liyana Global Limited | Wholesale & retail | 2025 |
| Li’S Technology & Logistics Ltd | Wholesale & retail | 2026 |
| Ljiljana Spasic-Gril Limited | Professional & scientific | 2022 |
| Ljksolutions Limited | Information & communication | 2018 |
| Ljubisic Properties Limited | Real estate | 2018 |
| LKE Homes Ltd | Construction | 2025 |
| LKR Nationwide Limited | Administrative & support | 2013 |
| Llbros Ltd | Other services | 2025 |
| Llexons Ltd | Hospitality | 2012 |
| Lloyd Masters Consulting (UK) Limited | Professional & scientific | 1989 |
| Lloyd Masters Consulting Limited | Professional & scientific | 2009 |
| Lloyd Masters Group Limited | Professional & scientific | 1991 |
| LM Performance Studios Ltd | Wholesale & retail | 2022 |
| LM Plumber Services Ltd | Extraterritorial | 2024 |
| Lmas Hire Limited | Administrative & support | 2025 |
| Lmde Accountants Limited | Professional & scientific | 2014 |
| Lmde Limited | Extraterritorial | 2015 |
| LML Agri Services Limited | Construction | 2016 |
| LMP Mortgage Ltd | Financial services | 2023 |
| LMS Creative Ltd | Professional & scientific | 2023 |
| LNA Scaffolding Limited | Construction | 2016 |
| LO & Behold Insight Ltd | Professional & scientific | 2026 |
| LO & Co Property Ltd | Real estate | 2020 |
| Loakes Finance Limited | Professional & scientific | 2017 |
| Loakes House Freehold Limited | Real estate | 2000 |
| Loakes Management Company Limited | Households | 1987 |
| Lobbylist Ltd | Information & communication | 2023 |
| Local Gardener Limited | Other services | 2012 |
| Local Repair Services Ltd | Manufacturing | 2022 |
| Local Taxis HW Ltd | Transport & logistics | 2025 |
| Locksmith Consulting Limited | Professional & scientific | 2020 |
| Locomark Limited | Professional & scientific | 2008 |
| Lodge Incorporated Limited | Professional & scientific | 2011 |
| Lodgemore Limited | Households | 1973 |
| Logic Accountancy Solutions Ltd | Professional & scientific | 2013 |
| Logistics Properties Limited | Real estate | 2025 |
| Logsulike Ltd | Wholesale & retail | 2021 |
| Loked in. Ltd | Wholesale & retail | 2025 |
| Loljack Ltd | Wholesale & retail | 1999 |
| Lombok Investments Limited | Financial services | 2016 |
| London Black Investments Ltd | Real estate | 2026 |
| London CAB Services Ltd | Transport & logistics | 2025 |
| London Community AID Network | Education | 2024 |
| London Globaled Ventures Ltd | Education | 2018 |