| Lawton Company Investments Ltd | Financial services | 2019 |
| LE Noir Luxury Ltd | Wholesale & retail | 2025 |
| Leemar Property Solutions Limited | Real estate | 2022 |
| Legacy Loot Ltd | Wholesale & retail | 2025 |
| Lehung Limited | Hospitality | 2024 |
| Lescott Courts Limited | Professional & scientific | 2008 |
| Letnlink Ltd | Information & communication | 2024 |
| Levi Services Ltd | Construction | 2020 |
| Lexcom Solutions Limited | Professional & scientific | 2004 |
| LG Rental Ltd | Real estate | 2021 |
| Lijori Ltd | Wholesale & retail | 2025 |
| Lillian Properties Ltd | Real estate | 2024 |
| Limitless Growth Ltd | Information & communication | 2024 |
| Lincolnshire Rescue Kennels Limited | Other services | 2015 |
| Lindon Analytics, BI & Advisory Ltd | Information & communication | 2025 |
| Lion Wise Education Ltd | Education | 2018 |
| LIPI2020 Ltd | Construction | 2021 |
| Little Critters Ltd | Agriculture & fishing | 2018 |
| Lizard Landscaping Ltd | Administrative & support | 2025 |
| LJC Project Management Services Ltd | Professional & scientific | 2017 |
| Lmcounselling Ltd | Health & social care | 2023 |
| LNJ Rejunation Clinic Ltd | Health & social care | 2024 |
| Local Reliable Cleaning Ltd | Administrative & support | 2024 |
| Locum Klaudia Ltd | Health & social care | 2023 |
| Logix Advisory Limited | Professional & scientific | 2019 |
| London Production Services Ltd | Information & communication | 2019 |
| London Uncovered Taxi Tours Limited | Transport & logistics | 2026 |
| Loop Grafika Ltd | Information & communication | 2014 |
| Lovi Top Carrier Limited | Transport & logistics | 2017 |
| LS Chapman Construction Ltd | Construction | 2023 |
| Luta LDN Ltd | Information & communication | 2024 |
| Luxury Garden Services Ltd | Administrative & support | 2025 |
| Luxury Wheels Ltd | Transport & logistics | 2018 |
| LVEGAS2022 Ltd | Transport & logistics | 2022 |
| LWR Etrade International Limited | Information & communication | 2017 |
| M2C Holdings Limited | Financial services | 2024 |
| M2C Trading Limited | Real estate | 2024 |
| Madar VFX & Film Ltd | Information & communication | 2024 |
| Magic City Services Ltd | Construction | 2018 |
| Magic Grip | Professional & scientific | 1960 |
| Major Fitness Ltd | Transport & logistics | 2018 |
| Malen Drive Ltd | Transport & logistics | 2021 |
| Malmr Ltd | Manufacturing | 2021 |
| Marine Devices Limited | Wholesale & retail | 2013 |
| Maroc Tribal LLP | | 2016 |
| Masters Cash and Carry Limited | Wholesale & retail | 2025 |
| Matthew Cross Limited | Professional & scientific | 2025 |
| Mavely Recruitment Ltd | Administrative & support | 2025 |
| Maxiclean Ltd | Administrative & support | 2024 |
| Mazsycards Ltd | Extraterritorial | 2016 |
| Mcny Limited | Manufacturing | 2015 |
| Mearswick Ltd | Real estate | 1997 |
| Medical Tourism Services Ltd | Administrative & support | 2017 |
| Medland Technologies Ltd | Information & communication | 2022 |
| Mellissa Terrie Marie Francis Limited | Extraterritorial | 2025 |
| Mellows Southminster Ltd | Hospitality | 2023 |
| Memotale Ltd | Wholesale & retail | 2023 |
| Mike Shield Ltd | Transport & logistics | 2021 |
| Mills Financial Services Ltd | Professional & scientific | 2025 |
| Mini Tech Limited | Wholesale & retail | 2016 |
| Mirci Ltd | Transport & logistics | 2018 |
| Mista Industrial Ltd | Construction | 2026 |
| MN Prestige Transport Ltd | Transport & logistics | 2026 |
| Mojo RA Wind Ltd | Construction | 2025 |
| Mokanszky Ltd | Professional & scientific | 2021 |
| Molnar Services Ltd | Administrative & support | 2021 |
| More Than Falafel Ltd | Hospitality | 2025 |
| Motion Autos Ltd | Wholesale & retail | 2024 |
| Movement Philosophy Ltd | Arts & recreation | 2021 |
| MP Creations Limited | Information & communication | 2014 |
| Multi Variation Collations Limited | Wholesale & retail | 1997 |
| Multigrip International Limited | Wholesale & retail | 1998 |
| Multiply X Limited | Information & communication | 2023 |
| Muse Make UP Ltd | Wholesale & retail | 2018 |
| MW Driving School Ltd | Education | 2023 |
| My Happy Windows Ltd | Administrative & support | 2022 |
| Mylifefactory Ltd | Information & communication | 2022 |
| N-Vision Social Work Ltd | Health & social care | 2022 |
| N1MM Ltd | Transport & logistics | 2024 |
| Nakavision Ltd | Wholesale & retail | 2025 |
| Nandors Maintenance Ltd | Administrative & support | 2023 |
| NAP Clothing Ltd | Wholesale & retail | 2012 |
| Nash Corporation Limited | Professional & scientific | 2019 |
| Natlee Holdings Ltd | Administrative & support | 2018 |
| Natural Treasure Ltd | Wholesale & retail | 2020 |
| NEU Transport Ltd | Administrative & support | 2014 |
| Neurospecial Ltd | Education | 2024 |
| New Technology Developments Limited | Extraterritorial | 2011 |
| Nextdeal Ltd. | Hospitality | 2016 |
| Nivina Ltd | Construction | 2025 |
| NLA Europe Limited | Arts & recreation | 2019 |
| NO19 Cleaning Ltd | Administrative & support | 2024 |
| Nogeta Solutions Ltd | Transport & logistics | 2013 |
| Nomadus Architecture Limited | Professional & scientific | 2024 |
| NOT Leaking BRO Ltd | Construction | 2024 |
| NRS Executive Ltd | Administrative & support | 2006 |
| NTN Twenty One Ltd | Real estate | 2024 |
| O&M CRO Expert Limited | Wholesale & retail | 2022 |
| O.B.S Property Services Ltd | Administrative & support | 2005 |
| Oak & Core Pilates Ltd | Education | 2026 |