| London Magic Traders Limited | Wholesale & retail | 2021 |
| London Sash Window Repairs Ltd | Construction | 2017 |
| London Souvenirs & Gifts Ltd | Wholesale & retail | 2011 |
| London Student Mentoring Ltd | Education | 2018 |
| London Voice & Swallowing Limited | Health & social care | 2018 |
| Lonewolf Advisory Limited | Information & communication | 2026 |
| Longland Farm Ltd | Agriculture & fishing | 2016 |
| Longleys Private Hire Ltd | Transport & logistics | 2013 |
| Longport Cafe Ltd | Hospitality | 2025 |
| Lonsdale Rail Engineering Ltd | Professional & scientific | 2018 |
| Lord Whisky Centre Limited | Wholesale & retail | 2003 |
| Lorne Brown Properties Limited | Real estate | 2020 |
| Lorne Brown T/A Canada Cabs Limited | Other services | 2018 |
| Lotlink Systems Ltd | Manufacturing | 2010 |
| Lotransport Ltd | Transport & logistics | 2016 |
| Louise Phillips Limited | Professional & scientific | 2021 |
| Loumatom Ltd | Construction | 2010 |
| Louryan Ltd | Wholesale & retail | 2026 |
| Love Capture Limited | Real estate | 2018 |
| Love Legacy Holdings Limited | Professional & scientific | 2023 |
| Love Wealth Management Limited | Financial services | 2020 |
| Lowspecgamer Limited | Information & communication | 2023 |
| Loya Oluto Limited | Professional & scientific | 2019 |
| Loyalty Designed Ltd | Professional & scientific | 2021 |
| Lrbpm Ltd | Professional & scientific | 2018 |
| LRD Future Limited | Hospitality | 2025 |
| LT Asset Management (Ickham) Limited | Other services | 2017 |
| LU4 SAW Properties Ltd | Real estate | 2016 |
| Luan Properties Limited | Real estate | 2020 |
| Luca Property Improvement Ltd | Construction | 2015 |
| Lucas Construction Services Ltd | Construction | 2024 |
| Lucient Technology Ltd | Information & communication | 2022 |
| Lucketts Farm Care Ltd | Health & social care | 2025 |
| Luckhurst Scaffolding Limited | Construction | 2001 |
| Lucky Star New Limited | Hospitality | 2016 |
| Luffield Properties Limited | Real estate | 2002 |
| Lukadia (UK) Limited | Transport & logistics | 1987 |
| Lukalex Services Limited | Construction | 2019 |
| Luke Bicknell Business Coaching Limited | Administrative & support | 2023 |
| Luke Howard Ltd | Health & social care | 2015 |
| Lullingstone Court Limited | Real estate | 1988 |
| Lulzim Aliaj Transport Ltd | Transport & logistics | 2013 |
| Lumibyte Limited | Information & communication | 2024 |
| Lumiere EDU Limited | Education | 2024 |
| Lumos Lighting Group Ltd | Wholesale & retail | 2022 |
| Luna Wear Ltd | Wholesale & retail | 2025 |
| Lunchbox (Kent) Ltd | Hospitality | 2009 |
| Luxmoore House Limited | Households | 2009 |
| Luxury Giving Ltd | Arts & recreation | 2025 |
| Luxury Watch Straps Ltd | Extraterritorial | 2021 |
| Lydden HMC Limited | Arts & recreation | 2023 |
| Lyndsell & SON Ltd | Wholesale & retail | 2020 |
| Lára Spirits Limited | Wholesale & retail | 2023 |
| M & a Removals (Europe) Ltd | Transport & logistics | 2014 |
| M & K Estates Kent Ltd | Real estate | 2025 |
| M a Clark Brickwork Ltd | Construction | 2015 |
| M a Mason Electrical Services Limited | Construction | 2014 |
| M a Transfers Ltd | Transport & logistics | 2024 |
| M Molnar Services Limited | Health & social care | 2006 |
| M Oldfield Ltd | Transport & logistics | 2018 |
| M&D International Ltd | Transport & logistics | 2021 |
| M&G Taxi Limited | Transport & logistics | 2018 |
| M&L Riggs Ltd | Construction | 2019 |
| M&L Trans Ltd | Transport & logistics | 2025 |
| M&W Renewables Ltd | Construction | 2026 |
| M. I. R. Limited | Wholesale & retail | 1986 |
| M.A.R.C. (Co. GB) Limited | Wholesale & retail | 1996 |
| M.A.Y. Design Limited | Professional & scientific | 1976 |
| M.C.E.A Lifestyle Ltd | Other services | 2019 |
| M.E.N Productions Limited | Arts & recreation | 2000 |
| M.J.P.C. (UK) Ltd | Manufacturing | 2013 |
| M.S.M. Holdings Limited | Professional & scientific | 1998 |
| M15 007 Ltd | Real estate | 2025 |
| Maad Products Ltd | Wholesale & retail | 2018 |
| Maan Global Limited | Wholesale & retail | 2024 |
| MAC Healthcare Ltd | Health & social care | 2024 |
| Mac's Cars Limited | Transport & logistics | 2022 |
| Machiavelli Investments Limited | Real estate | 2006 |
| Mack and Matthews Limited | Wholesale & retail | 2025 |
| MAD Bags Ltd | Manufacturing | 2024 |
| Made by Alice Limited | Professional & scientific | 2015 |
| Maestro Digital Limited | Administrative & support | 2021 |
| MAF Investment Management Ltd | Extraterritorial | 2013 |
| Magdalen Court (Block a) RTM Company Limited | Households | 2019 |
| Magdalen Court (Block B) RTM Company Limited | Households | 2019 |
| Magenta Assets Ltd | Real estate | 2018 |
| Magentic Labs Limited | Financial services | 2024 |
| Magic Hattie Limited | Hospitality | 2023 |
| Magic Mops Cleaning Services Ltd | Other services | 2025 |
| Magical Holidays Limited | Administrative & support | 2017 |
| Magnum Home Physios Ltd | Health & social care | 2025 |
| MAI Property Development Ltd | Real estate | 2020 |
| Maid IT Cleaning Services Ltd | Administrative & support | 2021 |
| Maid IT Commercial Ltd | Administrative & support | 2022 |
| Maids to Perfection Ltd | Administrative & support | 2026 |
| Maine Motor Solutions Limited | Wholesale & retail | 2003 |
| Mainland One Ltd | Real estate | 2017 |
| Mains Mate Ltd | Information & communication | 2026 |
| Maipenrai Orthopods Limited | Professional & scientific | 2016 |
| Maitland Care Limited | Extraterritorial | 2009 |