| Livara Care Ltd | Health & social care | 2026 |
| Liverpool Student Living Ltd | Real estate | 2014 |
| Living Testimony Limited | Hospitality | 2014 |
| Living Testimony Property Ltd | Financial services | 2022 |
| Living With Reality Limited | Professional & scientific | 2025 |
| LJG Business Consultancy Ltd. | Professional & scientific | 2016 |
| Ljmj Care Limited | Health & social care | 2015 |
| Llrw Ltd | Real estate | 2023 |
| LM Investments Ltd | Real estate | 2022 |
| LMW Labs Ltd | Professional & scientific | 2015 |
| LOC Aviation Services Ltd | Transport & logistics | 2024 |
| Lockwood Court Crawley Maintenance Limited | Administrative & support | 1988 |
| Logic Roofing Ltd | Construction | 2023 |
| Logicmission Limited | Information & communication | 2000 |
| Lola’S Candy Ltd | Wholesale & retail | 2023 |
| London Bike Bays Ltd | Information & communication | 2020 |
| London Business Union Ltd | Financial services | 2020 |
| London City Developments Limited | Construction | 1987 |
| London Link Logistics Ltd | Transport & logistics | 2023 |
| London Metro Cars Ltd | Transport & logistics | 2024 |
| London Pumps Ltd | Manufacturing | 1999 |
| London Rubbish Clearance Ltd | Water & waste | 2025 |
| Long Live Company Limited | Hospitality | 2015 |
| Longhurst Electrical Services Limited | Construction | 2007 |
| Longman Gates Aluminium Limited | Construction | 2022 |
| Longs Enterprise Ltd | Professional & scientific | 2016 |
| Longs Property Enterprise Ltd | Real estate | 2024 |
| Longsword Consulting Limited | Extraterritorial | 2016 |
| Lormark Limited | Information & communication | 2020 |
| Lov-A FIX Ltd | Real estate | 2023 |
| Love Heaven Limited | Wholesale & retail | 2026 |
| Love Your Bathroom Ltd | Wholesale & retail | 2012 |
| Lovely Eira Ltd | Wholesale & retail | 2020 |
| Lovyouth Limited | Wholesale & retail | 2019 |
| LRS Accounting Services Limited | Professional & scientific | 2024 |
| LRS Contractors Ltd | Construction | 2025 |
| Lrso Ltd | Real estate | 2023 |
| Lswalters Limited | Real estate | 2020 |
| LT Home Solutions Ltd | Administrative & support | 2018 |
| LTA Claims Limited | Professional & scientific | 2010 |
| LTA Collections Group Limited | Financial services | 1936 |
| Lubborn Cheese Limited | Manufacturing | 1978 |
| Luciano Ciccone Limited | Wholesale & retail | 2011 |
| Lucid EPM Limited | Information & communication | 2013 |
| LUCKY13 Action Ltd | Arts & recreation | 2018 |
| Luckyhome Properties Limited | Real estate | 2017 |
| Luna Group (Southern) Ltd | Financial services | 2023 |
| Lupo Advisory Services Ltd | Professional & scientific | 2024 |
| Lustre Design Limited | Professional & scientific | 2018 |
| Luxvisuals Ltd | Professional & scientific | 2025 |
| LUZ DE Lugo Limited | Wholesale & retail | 2025 |
| Lynchmere Place (Guildford) Limited | Households | 2003 |
| Lynx CUE Sports Limited | Arts & recreation | 2019 |
| Lyza Aviation Limited | Administrative & support | 2017 |
| M Chandler Support Services Limited | Manufacturing | 2017 |
| M H Land Ltd | Professional & scientific | 2015 |
| M J Preston Electrical Ltd | Administrative & support | 2017 |
| M Lowe Builders LLP | | 2011 |
| M Mclean Limited | Health & social care | 2016 |
| M Myers Solutions Limited | Professional & scientific | 2012 |
| M R Trading (UK) Limited | Construction | 2011 |
| M S Kecek Limited | Financial services | 2023 |
| M&E Design and Build Ltd | Construction | 2013 |
| M. B. Racing Limited | Arts & recreation | 1995 |
| M.B Plumbing and Heating Solutions Ltd | Construction | 2022 |
| M.Phillips Services Ltd | Construction | 2021 |
| M.W. Services of Redhill Limited | Wholesale & retail | 2012 |
| M2M Global Logistics Limited | Transport & logistics | 2015 |
| M3CONCEPT Limited | Information & communication | 2020 |
| M5 Promotions Limited | Wholesale & retail | 2018 |
| MA (London) Holdings Ltd | Financial services | 2017 |
| MA Design Consulting Limited | Administrative & support | 2011 |
| MAC Worktop Ltd | Construction | 2021 |
| Macdonald Surveyor Limited | Professional & scientific | 2024 |
| Macham Investments Limited | Real estate | 2014 |
| Mack Built Limited | Construction | 2017 |
| Macmar Group Limited | Professional & scientific | 2024 |
| Macnaughton and Company Solutions Limited | Construction | 2025 |
| Macro Climbing Ltd. | Education | 2026 |
| Macrocosm.London Ltd | Information & communication | 2025 |
| MAD. Clothing Ltd | Wholesale & retail | 2020 |
| Made by Milola Ltd | Manufacturing | 2023 |
| Madjuba Limited | Information & communication | 2004 |
| Maecenas Music Limited | Other services | 1988 |
| Magic Price Trading Limited | Transport & logistics | 2008 |
| Magical Press Ltd | Wholesale & retail | 2024 |
| Magpie Nove Ltd | Real estate | 2024 |
| Maidenhead Properties Limited | Real estate | 2017 |
| Maidenhead Property Investment Limited | Real estate | 2011 |
| Main Stream Productions Limited | Professional & scientific | 2017 |
| Maison Montéo Ltd | Wholesale & retail | 2026 |
| Major Consulting Limited | Professional & scientific | 2020 |
| Makesafe Facades Ltd | Construction | 2025 |
| Maktub Productions Ltd | Information & communication | 2022 |
| Malabar Limited | Wholesale & retail | 1999 |
| Malavarn Ltd | Real estate | 2014 |
| Maliance Property Limited | Real estate | 2025 |
| Malkal Limited | Wholesale & retail | 2021 |
| Malmstone Property Management Ltd | Real estate | 2014 |
| Malws Consulting Limited | Professional & scientific | 2017 |