| Larwood Limited | Professional & scientific | 1995 |
| LAS Care Limited | Health & social care | 2023 |
| Lckm Limited | Real estate | 2021 |
| LDW Consultancy Limited | Administrative & support | 2007 |
| LE Alma Limited | Other services | 2026 |
| Lean Lucy Limited | Professional & scientific | 2018 |
| LEE Property Group Ltd | Real estate | 2019 |
| Legacy and Key Property Ltd | Real estate | 2025 |
| Legg Properties Limited | Real estate | 2019 |
| Lektron NPC Limited | Construction | 2021 |
| Leverton Freehold Ltd | Real estate | 2015 |
| Leverton House Maintenance Ltd | Households | 2020 |
| Libero Licensing Ltd | Households | 2018 |
| Libra Financial Planning Limited | Financial services | 1998 |
| Life of Whales UK Ltd | Manufacturing | 2021 |
| Light Space Build Limited | Construction | 2022 |
| LIGHTHOUSE4 Limited | Extraterritorial | 2015 |
| Lights Camera Rigging Ltd | Construction | 2025 |
| Lily-Pad Swimming School Limited | Arts & recreation | 2023 |
| Lincoln Grove Estates Limited | Real estate | 2011 |
| Lincoln Grove Holdings Ltd | Financial services | 2025 |
| Lincoln Grove Ltd | Real estate | 2025 |
| Link Box Express Limited | Transport & logistics | 2025 |
| Link Box Logistics Ltd | Transport & logistics | 2025 |
| Linkgistics Ltd | Construction | 2021 |
| Linscapes Ltd | Administrative & support | 2016 |
| Lion Automation Limited | Construction | 2018 |
| Little Cherubs Nursery Limited | Education | 2011 |
| Littleton Residents' Company Limited | Households | 1996 |
| LK Woking Ltd | Administrative & support | 2007 |
| Llewellyn-Price Managing Agent Limited | Other services | 2019 |
| LMS Corporate Communications Ltd | Professional & scientific | 2023 |
| Lombard Rock Administration Limited | Professional & scientific | 2019 |
| London City Cleaning Limited | Administrative & support | 1982 |
| London Fireproofing Ltd | Construction | 2023 |
| London Fitness Training Limited | Arts & recreation | 2008 |
| London Green Resources Limited | Water & waste | 2016 |
| London Property and Development Ltd | Construction | 2020 |
| Louiserose Ltd | Real estate | 2018 |
| Love Life Products Ltd | Manufacturing | 1996 |
| Loved and Loved Again Ltd | Wholesale & retail | 2022 |
| LOW Maintenance Building Services Ltd | Construction | 2018 |
| LSB Carpentry & Roofing Limited | Construction | 2024 |
| LSB Construction Group Limited | Financial services | 2024 |
| LSB Groundworks & Masonry Limited | Construction | 2024 |
| LSB Internal Renovations Limited | Construction | 2024 |
| LSB Kitchens, Bathrooms & Joinery Limited | Construction | 2024 |
| Lscm Limited | Transport & logistics | 2025 |
| Luna GAS Solutions Ltd | Professional & scientific | 2021 |
| Luxe Home Labels Ltd | Wholesale & retail | 2023 |
| M a Saeed Ltd | Health & social care | 2012 |
| M B S Security Ltd | Administrative & support | 2023 |
| M I T Skills Limited | Education | 1998 |
| M J Food & Wine Store Ltd | Wholesale & retail | 2018 |
| M. C. P. Limited | Wholesale & retail | 1981 |
| Macleod & Macleod (Ludshott) Partnership | | 2001 |
| Madiston Limited | Information & communication | 2005 |
| Mahon Consultancy Limited | Professional & scientific | 2017 |
| Makaia Limited | Wholesale & retail | 2025 |
| Malee Natural Science Ltd | Health & social care | 2013 |
| Manavsewa Ashram UK Ltd | Health & social care | 2024 |
| Mann Developments UK Ltd | Real estate | 2023 |
| Manreas Limited | Real estate | 2021 |
| Marcas Media Ltd | Professional & scientific | 2019 |
| March Garden Landscapes Ltd | Professional & scientific | 2022 |
| Mark Perkins Creative Consultancy Ltd | Professional & scientific | 2024 |
| Mark Walker Signs Limited | Financial services | 2011 |
| Market Aware Limited | Professional & scientific | 1988 |
| Mars Beauty Ltd | Other services | 2023 |
| Marvel Technologies Ltd | Information & communication | 2015 |
| Masterclass Media Ltd | Information & communication | 2023 |
| Matthew Trustam Design Ltd | Professional & scientific | 2012 |
| Maven BJJ Limited | Arts & recreation | 2016 |
| MBH Design Studio EOT Limited | Administrative & support | 2022 |
| MBH Design Studio Limited | Professional & scientific | 2006 |
| MBH Developments Limited | Construction | 1996 |
| Mcalpha Services Limited | Professional & scientific | 2004 |
| Mcculloch Family Holdings Ltd | Construction | 2021 |
| Mcneely Property Services LLP | | 2019 |
| Mcray Holdings Limited | Wholesale & retail | 2023 |
| Mdezign Ltd | Wholesale & retail | 2023 |
| MEC Skip Hire Limited | Other services | 2022 |
| Medaxon Limited | Administrative & support | 2000 |
| Menlo Place Limited | Information & communication | 2019 |
| Mentra Mental Fitness Ltd | Education | 2025 |
| Mert Express Delivery Ltd | Transport & logistics | 2020 |
| Meshi Enterprise Limited | Construction | 2022 |
| Metal Monkey Studios Ltd | Information & communication | 2023 |
| Metro Cairns Skip Hire Limited | Transport & logistics | 2008 |
| Metro Financial Limited | Professional & scientific | 2023 |
| Metro Services London Ltd | Construction | 2018 |
| Metropolis Epsom Limited | Hospitality | 2023 |
| Metropolis Vauxhall Limited | Hospitality | 2023 |
| Mezis Healthcare Ltd | Health & social care | 2020 |
| Mglow Ltd | Wholesale & retail | 2018 |
| Miabelle Limited | Wholesale & retail | 2020 |
| Mica Projects Limited | Construction | 1982 |
| Milani Interiors Ltd | Wholesale & retail | 2016 |
| Milford Media Ltd | Wholesale & retail | 2009 |
| Mind Zone Consultancy Ltd | Education | 2020 |