| L & a Auto Services Ltd | Wholesale & retail | 2025 |
| L E a . Construction Ltd | Construction | 2020 |
| LAD Promotions Limited | Other services | 2015 |
| Lancing Court Commonhold Limited | Households | 2002 |
| Land & Commercial Property Company Ltd | Real estate | 2018 |
| Langley Chauffeurs Limited | Transport & logistics | 2023 |
| Langley Manor Residents Limited | Other services | 2005 |
| Langley Manor Residents RTM Company Limited | Households | 2017 |
| Langley Trading Limited | Financial services | 2024 |
| Laser Luxe Ltd | Other services | 2018 |
| Lawrence James Properties Limited | Real estate | 2018 |
| LB UK Property Ltd | Real estate | 2024 |
| LDN Design Collections Ltd | Wholesale & retail | 2024 |
| Leah Anderson Coaching & Consulting Ltd | Professional & scientific | 2026 |
| Learning Ladders Education Limited | Education | 2014 |
| Leaves Green Homes Limited | Construction | 2026 |
| Lecs Group Ltd | Professional & scientific | 2023 |
| Legal Cover Ltd | Professional & scientific | 2026 |
| Leoelo Ltd | Information & communication | 2019 |
| Leothina Holdings Ltd | Real estate | 2026 |
| Level-Line Limited | Energy | 2003 |
| Leylarner Ltd | Education | 2014 |
| Limetree Services Limited | Manufacturing | 2017 |
| Links Accountancy Limited | Professional & scientific | 2025 |
| Lipna International Ltd | Professional & scientific | 2016 |
| Little Bear Blue Limited | Manufacturing | 2024 |
| Little Fingers Montessori Nursery Limited | Education | 2017 |
| Little Legs Day Nursery and Pre-School Ltd | Health & social care | 2015 |
| Little Nurse Clinic Ltd | Health & social care | 2023 |
| Liv'In Luxurys Ltd | Real estate | 2026 |
| Livewire Electrics (Kent) Limited | Other services | 2023 |
| Lizge Ltd | Hospitality | 2019 |
| LK DRY Cleaners Ltd | Other services | 2017 |
| Lkhem&Stitch Ltd | Wholesale & retail | 2026 |
| LMH Hayes Ltd | Other services | 2019 |
| Lodge Dental Limited | Health & social care | 2023 |
| Lodge Fish Bar Limited | Hospitality | 2015 |
| Lona Interiors Ltd | Wholesale & retail | 2025 |
| London Design Training Course Ltd | Education | 2023 |
| London Executive Cleaning Limited | Administrative & support | 2020 |
| London Installations Group Limited | Construction | 2026 |
| London JU Jitsu Ltd | Arts & recreation | 2024 |
| London Orthoptics Limited | Health & social care | 2016 |
| London Renewables Limited | Construction | 2026 |
| Long Lane Farm IOW Limited | Agriculture & fishing | 2003 |
| Longfield Knotweed Solutions Ltd | Water & waste | 2013 |
| Lonz Ltd | Education | 2019 |
| Looboo Media Ltd | Administrative & support | 2018 |
| LOR Trading Limited | Professional & scientific | 2009 |
| Lotusedge Capital Ltd | Real estate | 2025 |
| Love Custom Art Limited | Arts & recreation | 2011 |
| Lowie Bricks UK Ltd | Manufacturing | 2025 |
| Loyal HL BIO LAB Ltd | Professional & scientific | 2025 |
| Loyal Hound Ltd | Financial services | 2025 |
| LSW Driving Services Limited | Transport & logistics | 2023 |
| Luci Bruce Aesthetics Ltd | Other services | 2018 |
| Lumley Developments Limited | Real estate | 2001 |
| Lunar Water Limited | Manufacturing | 2025 |
| Luxe&Logic Limited | Wholesale & retail | 2025 |
| Luxendar Ltd | Wholesale & retail | 2025 |
| Luxmi Properties Limited | Real estate | 2017 |
| Lyqproperty Ltd | Real estate | 2025 |
| L’Image Studio Ltd | Other services | 2026 |
| M Vasilev Consulting Limited | Information & communication | 2014 |
| M. Burrows Limited | Construction | 2007 |
| M. Hartman Construction Limited | Construction | 2010 |
| M. I. F. Professional Services Ltd | Administrative & support | 2018 |
| M.S.Jackson Ltd | Transport & logistics | 2021 |
| Mace Property Solutions Limited | Professional & scientific | 2009 |
| Mackenzie Weller Management Ltd | Professional & scientific | 2014 |
| Magic Total Building Solutions Limited | Construction | 2016 |
| Make Good Digital Limited | Professional & scientific | 2019 |
| Mako 3D Ltd | Professional & scientific | 2025 |
| Mamediz Limited | Real estate | 2025 |
| MAN Power Contractors UK Ltd | Administrative & support | 2021 |
| Mapex Pharmacy Consultancy Limited | Wholesale & retail | 2010 |
| Maple Holdings Lowco Limited | Financial services | 2024 |
| Maple Holdings Midco Limited | Financial services | 2024 |
| Maple Holdings Upper Midco Limited | Financial services | 2024 |
| March Associates Ltd | Administrative & support | 2012 |
| Marine Pension Solutions Ltd | Financial services | 2019 |
| Marinoil Limited | Extraterritorial | 2010 |
| Mary Foster Consulting Ltd | Professional & scientific | 2007 |
| Massala Kent Limited | Hospitality | 2024 |
| Master of None Ltd | Professional & scientific | 2025 |
| Matchwerk Recruitment Ltd | Administrative & support | 2025 |
| Matharu Holdings Limited | Wholesale & retail | 2025 |
| Mathsense Ltd | Education | 2019 |
| Mattr Ltd | Professional & scientific | 2015 |
| MAX Q (UK) Limited | Administrative & support | 2009 |
| MB1217 Limited | Construction | 2019 |
| Mcjoseph & Sons (DP) Ltd. | Hospitality | 2002 |
| MDM Derivatives Limited | Information & communication | 2015 |
| Me-Time Fitness Limited | Health & social care | 2016 |
| Meadow View Construction Limited | Professional & scientific | 1994 |
| Meaningful Financial Planning Ltd | Financial services | 2020 |
| Medicpharma Limited | Health & social care | 2022 |
| Meridian Space UK Limited | Information & communication | 2025 |
| Metis GRC Consultancy Ltd | Information & communication | 2026 |
| Mezzanine Creative Ltd | Information & communication | 2009 |