| LS Interior Design Limited | Professional & scientific | 2022 |
| Lsbc Limited | Information & communication | 2001 |
| LSE 1 Ltd | Real estate | 2025 |
| LSQ Construction Ltd | Construction | 2022 |
| LTB Transport Ltd | Extraterritorial | 2024 |
| LTG Investments Limited | Financial services | 2018 |
| LTL (Hopcraft) Ltd | Other services | 2008 |
| LTR Housing Solutions Limited | Real estate | 2026 |
| LTV Joinery Limited | Construction | 2019 |
| Ltye Ltd | Information & communication | 2013 |
| Lucaci Building Services Ltd | Construction | 2019 |
| Lucconi Top Stars Limited | Information & communication | 2023 |
| Lucianlica Construction Ltd. | Construction | 2021 |
| Lucid Homes Limited | Real estate | 2023 |
| Lucini London Limited | Wholesale & retail | 2024 |
| Lucky Flor Ltd | Construction | 2025 |
| Lucky Infosystem Ltd | Information & communication | 2023 |
| Lucky Seven Store Ltd | Wholesale & retail | 2025 |
| Luctim Ltd | Manufacturing | 2016 |
| Luggage Factory Limited | Wholesale & retail | 2023 |
| Luke UK Services Limited | Construction | 2019 |
| Lukvyta Limited | Construction | 2024 |
| Lumen Education Limited | Education | 2025 |
| Luminous Lanterns Ltd | Education | 2025 |
| Lunchbox Catering Ltd | Extraterritorial | 2016 |
| LUX DSI Transport Ltd | Transport & logistics | 2026 |
| LUX Therapy Ltd | Administrative & support | 2026 |
| LUX Vantage Ltd | Information & communication | 2025 |
| Luxastra Prospera Ventures Ltd | Financial services | 2023 |
| Luxe Motor Clinic Ltd | Wholesale & retail | 2021 |
| Luxtravel Services Ltd | Wholesale & retail | 2023 |
| Luxurious Enterprises Ltd | Professional & scientific | 2025 |
| Luxurious Medical Clinic Ltd | Health & social care | 2020 |
| Luxury Living Realty Ltd | Real estate | 2024 |
| Lwanda Limited | Health & social care | 2021 |
| Lyfti IT Innovations Ltd | Information & communication | 2025 |
| LZY & SON Limited | Hospitality | 2024 |
| M & a Wholesale Ltd | Wholesale & retail | 2023 |
| M & J Pipework Co Ltd | Construction | 2025 |
| M & M Autos (London) Limited | Wholesale & retail | 2018 |
| M & M Wholesale Ltd | Wholesale & retail | 2025 |
| M & S Products Limited | Manufacturing | 1998 |
| M a Housing and Support CIC | Education | 2024 |
| M Altamash Kamal Ltd | Wholesale & retail | 2025 |
| M C M PVT Ltd | Education | 2019 |
| M E K (UK) Limited | Wholesale & retail | 2012 |
| M Joinery & Carpentry Ltd | Manufacturing | 2023 |
| M Joinery Carpentry Ltd | Manufacturing | 2025 |
| M M Galactico Limited | Real estate | 2018 |
| M M Holdings Investment Limited | Construction | 2018 |
| M Manea Construction Ltd | Construction | 2021 |
| M P Cooling Limited | Construction | 2018 |
| M Veer Hundal Builders Ltd | Construction | 2020 |
| M&D Construct Ltd | Energy | 2016 |
| M&H Global Accountants Ltd | Professional & scientific | 2021 |
| M&H Ilford Limited | Wholesale & retail | 2026 |
| M&K Invest Ltd | Real estate | 2020 |
| M&M Alliance Ltd | Professional & scientific | 2024 |
| M&M Associate Ltd | Administrative & support | 2018 |
| M&N Recruitment Agency Ltd | Administrative & support | 2026 |
| M&S Accountants (London) Ltd | Professional & scientific | 2018 |
| M&S Appliances & Gadgets Ltd | Wholesale & retail | 2025 |
| M&S Group Limited | Construction | 2022 |
| M&V Solution Ltd | Construction | 2025 |
| M-Stiles Ltd | Construction | 2019 |
| M.A.S.S Spice Limited | Manufacturing | 2020 |
| M.D.C.S. Limited | Professional & scientific | 1988 |
| M1 247 Ltd | Wholesale & retail | 2014 |
| MA Building Solutions Ltd | Construction | 2015 |
| MA Electricals & GAS Works Ltd | Construction | 2019 |
| MA Keremora Limited | Real estate | 2026 |
| MA Peak Group Ltd | Wholesale & retail | 2026 |
| MA Peak Ltd | Wholesale & retail | 2025 |
| Ma&A Limited | Arts & recreation | 2017 |
| Maccj Limited | Real estate | 2026 |
| Macronet Solutions Limited | Information & communication | 2013 |
| Macstone Holdings Ltd | Professional & scientific | 2026 |
| Macto Altus Group Ltd | Financial services | 2024 |
| Madalkhon Ltd | Transport & logistics | 2020 |
| Madani Channel UK Ltd | Information & communication | 2018 |
| Madani News Ltd | Other services | 2018 |
| Madbull Ltd | Construction | 2020 |
| Made by Purple Ltd | Information & communication | 2022 |
| Made in Sindh Ltd | Professional & scientific | 2018 |
| Made Property Investments Limited | Real estate | 2023 |
| Madhav Group Limited | Wholesale & retail | 2023 |
| Madina Travels Ltd | Administrative & support | 2009 |
| Madurai Masala Limited | Hospitality | 2025 |
| MAFA532 Ltd | Health & social care | 2022 |
| Mafog Properties Limited | Construction | 2023 |
| Magic Fresh Nann Ltd | Wholesale & retail | 2026 |
| Magic Touch Luxe Ltd | Other services | 2026 |
| Magiccorn Barking Ltd | Hospitality | 2023 |
| Magicmark Limited | Construction | 2025 |
| Magnus Properties Limited | Construction | 2016 |
| Mago Concept Ltd | Other services | 2019 |
| Maha Fashion Ltd | Wholesale & retail | 2021 |
| Mahib Construction Limited | Construction | 2022 |
| Mahvix Ltd | Professional & scientific | 2026 |
| Maison Collective Limited | Real estate | 2023 |