| Light and Shade CCS Limited | Health & social care | 2023 |
| Light Lofts Ltd | Administrative & support | 2017 |
| Lighten Homes Ltd | Construction | 2024 |
| Lightning Electrical Services Limited | Energy | 2007 |
| Lightning Removals Limited | Transport & logistics | 2019 |
| Lila Rose Consulting Ltd | Administrative & support | 2017 |
| Lilli Holdings Limited | Real estate | 2020 |
| Lilli Investments Ltd | Real estate | 2019 |
| Lilly'Ss Maid Ltd | Other services | 2018 |
| Lillyhall Limited | Real estate | 2024 |
| Lilo GAS Limited | Construction | 2023 |
| Lily Funeral Services Limited | Other services | 2020 |
| Lily Nails Essex Limited | Other services | 2017 |
| Lily Risk Management Ltd | Professional & scientific | 2025 |
| Limedove Limited | Wholesale & retail | 2022 |
| Limehouse DRY Cleaning & Laundry Company Limited | Administrative & support | 2003 |
| Limehouse Management Limited | Real estate | 2024 |
| Limitless Welding Ltd | Other services | 2016 |
| Lina Property Services Limited | Real estate | 2022 |
| Linace Car & Commercials Ltd | Wholesale & retail | 2009 |
| Lincolnbrody Ltd | Information & communication | 2011 |
| Lind Holdings Limited | Financial services | 2017 |
| Lind Properties Limited | Real estate | 2017 |
| Linda O'Reilly Limited | Administrative & support | 2011 |
| Lindel Services Limited | Transport & logistics | 2000 |
| Lindex Solutions Limited | Information & communication | 2011 |
| Lineside Logistics (Southern) Ltd | Administrative & support | 2006 |
| Lings Kitchen Ltd | Hospitality | 2026 |
| Links Financial Services London Limited | Financial services | 2019 |
| Lipson & Co Limited | Professional & scientific | 2004 |
| Liquess Limited | Professional & scientific | 2023 |
| Liri Safety Limited | Administrative & support | 2022 |
| Lisa DI Palma Projects C.I.C. | Arts & recreation | 2025 |
| Lisdoonvarna Leisure Limited | Hospitality | 2017 |
| Lisus Construction Ltd | Construction | 2024 |
| Lita Management Limited | Administrative & support | 2015 |
| Little and Large Dental Practice Limited | Health & social care | 2014 |
| Little Devil Computing Limited | Information & communication | 1997 |
| Little Freddie Productions Limited | Information & communication | 2010 |
| Little Muslim Seedlings Ltd | Arts & recreation | 2025 |
| Little OMO Ltd | Wholesale & retail | 2021 |
| Little Pearls Nursery and Preschool Ltd | Education | 2024 |
| Little Stars N16 Limited | Education | 2016 |
| Littleverse Childcare Services Limited | Health & social care | 2026 |
| Livalex Consulting Ltd | Information & communication | 2018 |
| Live Mentoring CIC | Education | 2023 |
| Liveeta Ltd | Extraterritorial | 2024 |
| Liveforlonger Ltd | Arts & recreation | 2025 |
| Liveone Homes Limited | Real estate | 2012 |
| Living the Life Ltd | Other services | 2021 |
| Lixu Limited | Professional & scientific | 2022 |
| LJB Construction Management Solutions LLP | | 2012 |
| Lkfc BBB LLP | | 2023 |
| LL Disco Limited | Arts & recreation | 2025 |
| Lloyd & Larke Limited | Financial services | 2011 |
| Lloyd Hayden & Co Limited | Professional & scientific | 2012 |
| LLP Investment Services LLP | | 2015 |
| Llss Prep and Clean Ltd | Administrative & support | 2025 |
| LM Monopoly Investments Limited | Real estate | 2023 |
| LMB Site Services Limited | Construction | 2016 |
| LMG Cars Limited | Wholesale & retail | 2019 |
| LMN Support Services Limited | Administrative & support | 2018 |
| Load-It Haulage Ltd | Water & waste | 2020 |
| Loanow Limited | Information & communication | 2025 |
| Lobird Productions Limited | Professional & scientific | 2013 |
| LOC Tax Ltd | Professional & scientific | 2019 |
| Loc&Doc Ltd | Health & social care | 2026 |
| Local Express Removals Ltd | Transport & logistics | 2020 |
| Local WIN POT Ltd | Extraterritorial | 2023 |
| Location Transport Ltd | Transport & logistics | 2020 |
| Locations.Tv Limited | Information & communication | 2024 |
| Lockjaw Records Ltd | Wholesale & retail | 2023 |
| Lockwood Consulting Group Ltd | Administrative & support | 2024 |
| Loftsmart Loft Conversions Ltd | Construction | 2025 |
| Logic Electrical Services Ltd | Construction | 2022 |
| LOGIC14 Limited | Wholesale & retail | 2021 |
| Logical Drainage Solutions Ltd | Water & waste | 2017 |
| Logical Inspirations Ltd. | Health & social care | 2010 |
| Logical Waste Solutions Ltd | Administrative & support | 2017 |
| Logisticks Limited | Extraterritorial | 2013 |
| Logistics Holdings ETC Ltd | Transport & logistics | 2025 |
| Logreti Limited | Construction | 2024 |
| Lolinas Interiors Limited | Wholesale & retail | 2015 |
| Lolus Consulting Ltd | Information & communication | 2015 |
| Loly Build Ltd | Construction | 2017 |
| Lomopaul Ltd | Wholesale & retail | 2025 |
| London & Essex Drains Limited | Water & waste | 2018 |
| London & Essex Maintenance Limited | Construction | 2022 |
| London & Essex Mortgage Market Ltd | Professional & scientific | 2014 |
| London 54 Studios Limited | Information & communication | 2024 |
| London Application (IP) Ltd | Information & communication | 2024 |
| London Application Ltd | Information & communication | 2023 |
| London Boltons Limited | Real estate | 2020 |
| London Building Restoration Ltd | Construction | 2022 |
| London Construction and Property Solutions Ltd | Construction | 2025 |
| London Construction and Property Solutions Ltd Ltd | Construction | 2025 |
| London Crane Hire & Engineering Services Limited | Construction | 2005 |
| London Dental Sedation Ltd | Health & social care | 2021 |
| London Digital Talent Limited | Administrative & support | 2014 |
| London Elite Property Management Ltd | Hospitality | 2019 |