| Littlecloudnanny Ltd | Health & social care | 2024 |
| Littoral Ltd | Real estate | 2022 |
| Liut Swim Ltd | Education | 2022 |
| Livanta Global Ltd | Wholesale & retail | 2025 |
| Live Seeds Limited | Wholesale & retail | 2016 |
| Liver Plant & Tool Hire Limited | Administrative & support | 2005 |
| Living With HS Ltd | Health & social care | 2024 |
| Lizzie Mildinhall Ltd | Administrative & support | 2021 |
| LKC Construction Ltd | Construction | 2019 |
| LKE Repairs Ltd | Other services | 2025 |
| Llink Service Ltd | Administrative & support | 2014 |
| Lmek Construction Services Ltd | Construction | 2024 |
| LMK Constructions Ltd | Construction | 2014 |
| Lms(Uk) Ltd | Construction | 2016 |
| LN Hand Car Wash (Osterley) Ltd | Other services | 2018 |
| LNM Merchants Ltd | Wholesale & retail | 2022 |
| Load & Go Couriers Ltd | Transport & logistics | 2024 |
| Loaded Motors Ltd | Wholesale & retail | 2017 |
| Local Express Ltd | Wholesale & retail | 2023 |
| Locums Limited | Professional & scientific | 2018 |
| Lodge Bros. (Funerals) Limited | Other services | 1965 |
| Lodge Bros. EOT Trustee Limited | Other services | 2023 |
| Lodge Brothers Legal Services Limited | Professional & scientific | 2016 |
| Loftxtnd Limited | Construction | 2022 |
| Logic Expert Solutions Ltd | Information & communication | 2020 |
| Logicall Group UK Limited | Professional & scientific | 1998 |
| Logicall UK Limited | Transport & logistics | 1970 |
| Logpilot Limited | Information & communication | 2025 |
| Logq Limited | Information & communication | 2018 |
| Lolasbakes Limited | Wholesale & retail | 2021 |
| London and Surrey Clearance Services Ltd | Transport & logistics | 2025 |
| London Bargain Bazaar Limited | Wholesale & retail | 2025 |
| London Bespoke Kitchen and Joinery Limited | Manufacturing | 2025 |
| London Bespoke Windows Ltd | Construction | 2024 |
| London Buildings Work Ltd | Construction | 2009 |
| London Carpet Cleaning Limited | Administrative & support | 2014 |
| London College of Evolving Technology Limited | Information & communication | 2009 |
| London Homes Improvement Ltd | Construction | 2019 |
| London Inter Cleaning Ltd | Construction | 2024 |
| London Kids Cafe Ltd | Hospitality | 2024 |
| London Muthamil Mandram Ltd | Arts & recreation | 2024 |
| London One Building Services Ltd | Construction | 2016 |
| London PAT Ltd | Professional & scientific | 2012 |
| London Pointers Ltd | Transport & logistics | 2023 |
| London Roller Shutter Limited | Manufacturing | 2020 |
| London Roof and Guttering Limited | Construction | 2018 |
| London Sangaki Ltd | Manufacturing | 2021 |
| London School of Motoring Ltd | Education | 2023 |
| London Smart Tech Ltd | Financial services | 2021 |
| Lone Anchor Ltd | Wholesale & retail | 2025 |
| Longitude Tangents Ltd | Wholesale & retail | 2018 |
| Lopes & Gouveia Limited | Hospitality | 2017 |
| Lose FAT With Matt Ltd | Education | 2023 |
| Lost Enlightenment Ltd | Professional & scientific | 2025 |
| Loucars Limited | Wholesale & retail | 2025 |
| Loungo Services Limited | Health & social care | 2024 |
| Loxeyfoxcrafts Ltd | Wholesale & retail | 2026 |
| Loxwood Clay Pits Ltd | Administrative & support | 2017 |
| Lpfc Ltd | Construction | 2020 |
| LS & SON Today Ltd | Real estate | 2025 |
| LSD Construction Limited | Construction | 2025 |
| Luc/Pro Spray and Decorations Limited | Construction | 2024 |
| Lucash & Co Ltd | Wholesale & retail | 2012 |
| Lucent Digital Limited | Information & communication | 2019 |
| Lucy Cleaning 4U Limited | Administrative & support | 2024 |
| Ludlow Road Freehold Management Company Limited | Real estate | 2014 |
| Luke Walker Repairs Limited | Professional & scientific | 2016 |
| Lukokki Express Ltd | Other services | 2025 |
| Lulu Shine Cleaning Ltd | Administrative & support | 2020 |
| Lumadel Ltd | Administrative & support | 2024 |
| Luminaskn Ltd | Wholesale & retail | 2024 |
| Lussu Holdings Limited | Financial services | 2018 |
| LUX Hand Car Wash Ltd | Administrative & support | 2026 |
| LUX Home Looks Ltd | Real estate | 2024 |
| Luxeselection Ltd | Wholesale & retail | 2024 |
| Luxshan Investments Ltd | Real estate | 2021 |
| Luxsmart Automatic Ltd | Construction | 2015 |
| Luxsmart Automation Ltd | Construction | 2023 |
| Luxury Chauffeuring Services Ltd | Transport & logistics | 2024 |
| Luxury Gardens London Ltd | Construction | 2026 |
| Luxury Property Developer Ltd | Real estate | 2025 |
| Luxx Automotive Ltd | Wholesale & retail | 2022 |
| LUZ Games Ltd | Information & communication | 2019 |
| LV Investments Limited | Real estate | 2018 |
| Lvision Ltd | Construction | 2016 |
| Lyburn Construction Ltd | Construction | 2011 |
| Lyburn Homes Ltd | Real estate | 2025 |
| Lynx Plus Limited | Manufacturing | 2019 |
| Lysa General Cleaning Ltd | Administrative & support | 2024 |
| LYT Care Services Ltd | Health & social care | 2026 |
| M & a Electrical Ltd | Construction | 2022 |
| M & N Trading Limited | Hospitality | 2014 |
| M & S Accident Repairs Limited | Wholesale & retail | 1992 |
| M a Ahmad Limited | Wholesale & retail | 2023 |
| M Cutz Limited | Other services | 2020 |
| M Kakar Ltd | Households | 2025 |
| M Power Mobile Car Ltd | Wholesale & retail | 2021 |
| M S Plus Ltd | Transport & logistics | 2024 |
| M Sidhu Solutions Limited | Information & communication | 2014 |
| M&H Motors Trade Ltd | Wholesale & retail | 2025 |