| Liberty Verge Limited | Administrative & support | 2020 |
| Lifecycle Highways Ltd | Professional & scientific | 2026 |
| Lighthouse Secure Solutions Limited | Water & waste | 2020 |
| Lightmere Limited | Real estate | 1981 |
| Lignarius Developments Ltd | Construction | 2019 |
| Lionheart Security Services Ltd | Administrative & support | 2017 |
| Liontech Ltd | Information & communication | 2024 |
| Little BAM Bams Curiosity Village Ltd | Education | 2020 |
| Little Boutique Kingswinford Limited | Wholesale & retail | 2023 |
| Little Red Robin Ltd | Manufacturing | 2017 |
| Little Tree Day Nursery Ltd | Health & social care | 2023 |
| Live 2 Help Housing Ltd | Health & social care | 2024 |
| Live Music Enhancers Limited | Arts & recreation | 2025 |
| Lizards Enterprise Ltd | Manufacturing | 2025 |
| LJ Modern Bookkeeping Limited | Professional & scientific | 2022 |
| Llamedos Holdings Limited | Financial services | 2018 |
| LM Agricultural Holdings Limited | Financial services | 2024 |
| LME Pictures Limited | Information & communication | 2024 |
| LMH Marketing Solutions Limited | Professional & scientific | 2016 |
| LMR Welding and Pipework Services Ltd | Professional & scientific | 2026 |
| Local Scaffolding and Roofing Ltd | Construction | 2025 |
| Locker Bitz Limited | Construction | 2015 |
| Lockstead Limited | Financial services | 1996 |
| Lockwood Electrical & Plumbing Ltd | Construction | 2011 |
| Loganhall Ltd | Agriculture & fishing | 2001 |
| Logsys (Computer Maintenance) Limited | Information & communication | 1984 |
| Loler-Examinations Ltd | Professional & scientific | 2018 |
| London & Cambridge Properties Limited | Professional & scientific | 1994 |
| Longbridge NO 1 Limited | Professional & scientific | 2025 |
| Lord Cogingtons Limited | Wholesale & retail | 2017 |
| Louise House Management Limited | Households | 1995 |
| LPJ (Midlands) Limited | Construction | 2020 |
| LPJ Assets Limited | Financial services | 2025 |
| LPS Pipelines Ltd | Construction | 2026 |
| LS Optics Ltd | Professional & scientific | 2025 |
| LSC Doors Limited | Construction | 2023 |
| LTG Installations Ltd | Construction | 2013 |
| Lucas & Seaby Limited | Administrative & support | 1958 |
| Lucas Electrical Installations Ltd | Construction | 2021 |
| Luke Collett Tree Surgeons Limited | Agriculture & fishing | 2004 |
| Lukey Jewels Repairs Ltd | Other services | 2023 |
| Lumine Projects Ltd | Construction | 2021 |
| Luxe Beauty & Spa Ltd | Other services | 2022 |
| Luxe by Lottie Boutique Ltd | Wholesale & retail | 2024 |
| Lychgate Neighbours Limited | Households | 2022 |
| Lyndon Ltd | Construction | 2018 |
| M & D Transporting Ltd | Transport & logistics | 2025 |
| M & N Pubs Limited | Hospitality | 2022 |
| M a Dining Ltd | Hospitality | 2025 |
| M C Driveways & Utilities Ltd | Other services | 2025 |
| M C Fuller Associates Ltd | Professional & scientific | 2014 |
| M G L Construction Limited | Administrative & support | 1999 |
| M Harris & Co Limited | Construction | 2009 |
| M J Prosser Transport Limited | Transport & logistics | 2002 |
| M J Tromans Limited | Agriculture & fishing | 2026 |
| M J Waldron Commercial Insurance Services Ltd | Financial services | 2010 |
| M Lowe Fire & Security Ltd | Administrative & support | 2024 |
| M Tromans LLP | | 2025 |
| M&S Roofing Specialists Ltd | Construction | 2025 |
| M. Paints & Services Limited | Wholesale & retail | 1974 |
| M.A.C Electrical and Heating Services Ltd | Construction | 2013 |
| M.G.B. Press Brake Sections Limited | Manufacturing | 1990 |
| M7W Props Services Limited | Information & communication | 2016 |
| MA Spraying & Finishing Ltd | Construction | 2026 |
| MAC Scaffolding Solutions Ltd | Construction | 2022 |
| Madklam Limited | Real estate | 2004 |
| Magnet Lettings Ltd | Real estate | 2025 |
| Magpie Components and Fabrications Limited | Manufacturing | 2020 |
| Mahira Ltd | Hospitality | 2025 |
| Maidenhead Trade Park Management Company Limited | Administrative & support | 2009 |
| Malps.Inc Limited | Arts & recreation | 2025 |
| Manjinder Kang Investments Limited | Financial services | 2023 |
| Mannovation Limited | Construction | 2024 |
| Mapcom Limited | Administrative & support | 2015 |
| Mapleplan Limited | Real estate | 1994 |
| Mark Edward Stanforth Ltd | Public administration | 2026 |
| Market Hall Tavern Ltd | Hospitality | 2021 |
| Market Monitoring Limited | Information & communication | 2018 |
| Marklew Consultants Limited | Information & communication | 2007 |
| Markone Safety Solutions Ltd | Administrative & support | 2007 |
| Marlbrook Electrical Ltd. | Construction | 2009 |
| Marlbrook Properties Ltd | Financial services | 2020 |
| Marlot Ltd | Information & communication | 2021 |
| Marlot Property Ltd | Real estate | 2024 |
| Martin and Griffiths (Kingswinford) Limited | Wholesale & retail | 2018 |
| Mason Building & Civils Limited | Construction | 2022 |
| Massey Bricks Ltd | Real estate | 2022 |
| Masterflow Products Limited | Wholesale & retail | 2014 |
| Mastermind Intl Consultants Ltd | Professional & scientific | 2024 |
| Masterstone Driveways & Patios Ltd | Construction | 2025 |
| Masterstone Driveways Ltd | Construction | 2026 |
| Matrix Services Group Ltd | Manufacturing | 1999 |
| Mauriteft Consulting Ltd | Professional & scientific | 2020 |
| MB Design Tech Ltd | Manufacturing | 2020 |
| Mbal Realisations 2026 Ltd | Administrative & support | 2015 |
| Mbpa Holdings Limited | Financial services | 2010 |
| Mcbj Aircraft Services Ltd | Manufacturing | 2025 |
| Mcevoy Advanced Construction & Property Management Ltd | Construction | 2026 |
| Mcevoy Trading Company Ltd | Real estate | 2026 |
| Mcgrann Underhill & Co Ltd | Professional & scientific | 2023 |