| Luminating Consultancy Ltd | Professional & scientific | 2025 |
| Luminor Acquisitions Limited | Financial services | 2026 |
| Lumos 365 Ltd | Information & communication | 2018 |
| Luna Copta Limited | Professional & scientific | 2024 |
| Luna Massage & Spa Limited | Other services | 2024 |
| Lunalight Limited | Information & communication | 2015 |
| Lunar Coven Ltd | Wholesale & retail | 2023 |
| Lunar Rose Properties Limited | Real estate | 2026 |
| Lunaris Limited | Professional & scientific | 2010 |
| Lush Nails & Spa Ltd | Other services | 2023 |
| LUX Nail Studio Ltd | Other services | 2024 |
| LUX Space Creations Ltd | Construction | 2025 |
| LUX Window Systems Ltd | Manufacturing | 2024 |
| Luxe Social Studio Ltd | Information & communication | 2026 |
| Luxis Services Ltd | Information & communication | 2024 |
| Luxury Packaging UK Ltd | Manufacturing | 2020 |
| LVG Recruitment Limited | Administrative & support | 2024 |
| LW Marketplace Ltd | Wholesale & retail | 2024 |
| LWE Consultancy Ltd | Professional & scientific | 2011 |
| Lydax Associates Limited | Professional & scientific | 2017 |
| Lydiard Vehicle Preparation Services Ltd | Wholesale & retail | 2020 |
| Lyefield Court Management Company Limited | Professional & scientific | 2006 |
| Lyell (Lakes Resort) Limited | Real estate | 2024 |
| Lyell Residential (Bankfield) Limited | Real estate | 2023 |
| Lyell Residential (Hatton Garden) Limited | Real estate | 2023 |
| Lyell Trading Limited | Financial services | 2013 |
| Lyndale Cheltenham Limited | Real estate | 2003 |
| Lyndhurst Management (Salcombe) Limited | Households | 2004 |
| Lynne Matthews Consultants Limited | Professional & scientific | 2025 |
| Lyon Paul Limited | Professional & scientific | 2019 |
| Lyons Dental Services Limited | Health & social care | 2025 |
| Lypiatt Court Residents Association Limited | Households | 1974 |
| Lypiatt Ltd | Health & social care | 2025 |
| Lypiatt Mews Residents Association Limited | Households | 1993 |
| Lysnoweth House Management Limited | Households | 2017 |
| Lysnoweth Ltd | Construction | 2012 |
| Lyster Contracts Limited | Administrative & support | 2010 |
| LZ and LJ Property Ltd | Real estate | 2024 |
| LZG Properties Limited | Real estate | 2001 |
| Léargas Físiúil Ltd | Professional & scientific | 2025 |
| L’Express City Catering Services Ltd | Hospitality | 2026 |
| M & a Marketing Limited | Professional & scientific | 2017 |
| M & M Meats Limited | Wholesale & retail | 2008 |
| M & R Coldrooms Limited | Construction | 2007 |
| M & S Property Development (South West) Ltd | Construction | 2017 |
| M & T Construction Services Limited | Construction | 2020 |
| M & W Commercial Ltd | Real estate | 2025 |
| M a Aesthetics Clinic Ltd | Health & social care | 2021 |
| M a Bale Limited | Professional & scientific | 2018 |
| M a Flooring Limited | Construction | 2004 |
| M B Management Consulting Services Limited | Real estate | 2025 |
| M B Paint Solutions Limited | Manufacturing | 2022 |
| M Brands One Ltd | Hospitality | 2023 |
| M C H Estates Limited | Hospitality | 2006 |
| M C Stoves Limited | Construction | 2024 |
| M Chambers Limited | Health & social care | 2010 |
| M D King Properties Ltd | Real estate | 2024 |
| M Hassan Medical Services Ltd | Health & social care | 2026 |
| M J Builders (Lichfield) Limited | Construction | 2011 |
| M J H Limited | Real estate | 1948 |
| M Kavanagh Limited | Construction | 2003 |
| M Lambert Ltd | Extraterritorial | 2014 |
| M Nicholson Joinery Limited | Construction | 2022 |
| M P Prosolutions Limited | Construction | 2014 |
| M R Ratcliffe Premium Finance Limited | Professional & scientific | 1991 |
| M Reay Limited | Other services | 2003 |
| M S Shaw Building Contractors Limited | Construction | 2008 |
| M T Luker Building Services Ltd | Construction | 2013 |
| M T Mcmahon Decorators & Property Services Ltd | Construction | 2013 |
| M Townsend General Building Limited | Construction | 2010 |
| M V Carpentry and Construction Ltd | Construction | 2021 |
| M Watts Windows Limited | Construction | 2010 |
| M Williams & Sons Construction Ltd | Construction | 2018 |
| M&A Clark Ltd | Financial services | 2019 |
| M&C Racing , PRE Training & Rehabilitation Limited | Agriculture & fishing | 2025 |
| M&C Tracey Ltd | Real estate | 2021 |
| M&D Builders Cheltenham Ltd | Construction | 2021 |
| M&F Speed Ltd | Transport & logistics | 2019 |
| M&Gpubs Limited | Hospitality | 2024 |
| M&J Media Group Limited | Financial services | 2019 |
| M&M Printing and Promotions Limited | Manufacturing | 2017 |
| M&M Promotions Ltd | Arts & recreation | 2026 |
| M&M Samuel Ltd | Wholesale & retail | 2014 |
| M-Splice Limited | Construction | 2019 |
| M. a. Gomm Limited | Information & communication | 2003 |
| M. B. R. Howells Limited | Wholesale & retail | 1961 |
| M.A.M.A's Family Food Ltd | Hospitality | 2020 |
| M.A.Richards(Hawling)Limited | Agriculture & fishing | 1964 |
| M.D Construction of Cheltenham Limited | Construction | 2008 |
| M.E. Waste Services Limited | Water & waste | 2018 |
| M.E.E Property Services Ltd | Real estate | 2021 |
| M.H Safety Consultants Ltd | Public administration | 2024 |
| M.H.R. Investments Ltd | Real estate | 2011 |
| M.I.B. Trading Limited | Extraterritorial | 2009 |
| M.J. Pashley Ltd | Hospitality | 2009 |
| M.J. Wright & Sons Limited | Manufacturing | 1999 |
| M.R. Ratcliffe Consultants Limited | Financial services | 1987 |
| M12 Group Ltd | Construction | 2009 |
| M2 Media Limited | Manufacturing | 2025 |
| M2U Consultancy Limited | Professional & scientific | 2020 |