| Lynch Contractors Ltd | Administrative & support | 2016 |
| Lynch Investments Ltd | Construction | 2019 |
| Lyndhurst Laundrette Ltd | Administrative & support | 2022 |
| Lyndsay King Limited | Professional & scientific | 2018 |
| Lyntons (Hendon) Limited | Real estate | 1942 |
| Lynx Delivery Ltd | Construction | 2023 |
| Lynxnazar Limited | Professional & scientific | 2025 |
| Lyvion International Limited | Information & communication | 2026 |
| L’Orfebre LLP | | 2025 |
| M & D Umbrella Solutions Ltd | Information & communication | 2021 |
| M & E Group Holdings Ltd | Financial services | 2022 |
| M & E Group Property Ltd | Households | 2022 |
| M & H Construction Limited | Construction | 2017 |
| M & J Gill Ltd | Real estate | 2002 |
| M & J London Homes Ltd | Real estate | 2025 |
| M & K Properties Luton Ltd | Real estate | 2025 |
| M & K Solicitors Ltd | Professional & scientific | 2011 |
| M & P Paving Ltd | Administrative & support | 2023 |
| M & R Ventures Ltd | Wholesale & retail | 2012 |
| M & S Cleaning Service Limited | Administrative & support | 1998 |
| M & S Co Luton Ltd | Transport & logistics | 2022 |
| M & S Water Services (Utilities) Limited | Construction | 2007 |
| M a Hassan Ltd | Health & social care | 2015 |
| M a Karim & Co Limited | Real estate | 2022 |
| M a Khan Limited | Transport & logistics | 2023 |
| M a Legal Consultants Ltd | Professional & scientific | 2020 |
| M a M Rail Logistics Ltd | Construction | 2016 |
| M a Manzoor Limited | Health & social care | 2012 |
| M a Matin Accounting Ltd | Professional & scientific | 2013 |
| M and H Rentals Ltd | Transport & logistics | 2024 |
| M and K Autos Ltd | Wholesale & retail | 2026 |
| M and T Developers Ltd | Real estate | 2023 |
| M Automotive Limited | Wholesale & retail | 2019 |
| M B Q Group Ltd | Construction | 2023 |
| M C Group (Luton) Limited | Other services | 2008 |
| M Carter TM Ltd | Construction | 2025 |
| M D W Site Services Ltd | Construction | 2015 |
| M Dani Limited | Construction | 2014 |
| M Essa Civil Engineering Ltd | Construction | 2021 |
| M G M Haulage & Recycling Limited | Construction | 2010 |
| M G UK Electrics Limited | Construction | 2020 |
| M Gore Ltd | Administrative & support | 2017 |
| M H a Property Ltd | Real estate | 2021 |
| M H Kurek Ltd | Other services | 2014 |
| M H S Motors Limited | Wholesale & retail | 2024 |
| M J a Academy Limited | Education | 2020 |
| M J a Hair Limited | Other services | 2015 |
| M J a Property Solutions Ltd | Real estate | 2017 |
| M J a Wigs Limited | Wholesale & retail | 2020 |
| M J Bonner Carpentry Limited | Construction | 2003 |
| M J Bookkeepers Limited | Professional & scientific | 2011 |
| M J Entertainment Ltd | Arts & recreation | 2020 |
| M J Morrison Limited | Construction | 2014 |
| M J Reilly & Sons Ltd | Construction | 2019 |
| M K M Trading Ltd | Wholesale & retail | 2014 |
| M K S Plastering Contractors Limited | Construction | 2025 |
| M K'S Health & Beauty Limited | Other services | 2015 |
| M Kaur Properties Ltd | Real estate | 2025 |
| M Khan Motors Limited | Transport & logistics | 2022 |
| M M O Consulting Limited | Professional & scientific | 2004 |
| M M Pipework Limited | Construction | 2019 |
| M Merchandising Ltd | Professional & scientific | 2025 |
| M Noor Ltd | Real estate | 2023 |
| M O'Malley Investments Limited | Professional & scientific | 2017 |
| M P Park Homes Ltd | Real estate | 2025 |
| M Prop Ltd | Real estate | 2018 |
| M Purdasy Property Limited | Real estate | 2022 |
| M R Launderette Ltd | Other services | 2014 |
| M R Welding Limited | Construction | 2015 |
| M Riaz Estates Ltd | Real estate | 2026 |
| M S Construction (Luton) Ltd | Construction | 2020 |
| M S Discount Store Ltd | Wholesale & retail | 2025 |
| M S Property Holdings (Luton) Limited | Real estate | 2018 |
| M Shaz Ltd | Professional & scientific | 2018 |
| M Suleman Icebox Ltd | Hospitality | 2026 |
| M Zaheer Properties Ltd | Real estate | 2018 |
| M&A Brothers Ltd | Hospitality | 2023 |
| M&A Carpet and Furniture Ltd | Wholesale & retail | 2021 |
| M&A M.O.T Centre Limited | Wholesale & retail | 2018 |
| M&B Merchant Ltd | Wholesale & retail | 2019 |
| M&C&B Solutions Ltd | Construction | 2025 |
| M&Cca Limited | Professional & scientific | 2011 |
| M&Ci Ltd | Administrative & support | 2022 |
| M&D Accountancy Ltd | Professional & scientific | 2016 |
| M&D UK Enterprises Ltd | Wholesale & retail | 2024 |
| M&H Events Ltd | Hospitality | 2022 |
| M&H Express Limited | Transport & logistics | 2023 |
| M&H Homes Ltd | Real estate | 2020 |
| M&H Trade Ltd | Wholesale & retail | 2023 |
| M&K Investments (Luton) Ltd | Other services | 2019 |
| M&K Security Ltd | Administrative & support | 2025 |
| M&M 24/7 Tyres Ltd | Manufacturing | 2026 |
| M&M Auto Parts Ltd | Wholesale & retail | 2026 |
| M&M Bodyworks Ltd | Wholesale & retail | 2026 |
| M&M Clothing Boutique Ltd | Wholesale & retail | 2021 |
| M&M First Choice Limited | Hospitality | 2014 |
| M&M Trans-Steel Ltd | Construction | 2014 |
| M&M Vans Ltd | Wholesale & retail | 2026 |
| M&M100 Property Services Ltd | Real estate | 2020 |
| M&N Education Ltd | Construction | 2023 |