| Lyvennet Organic Ltd. | Manufacturing | 2019 |
| LZ Personnel Limited | Administrative & support | 2013 |
| LZA Foods Bristol Limited | Hospitality | 2025 |
| LZA Properties Limited | Real estate | 2025 |
| LZJ Properties Limited | Real estate | 2020 |
| Löwn & Behold Ltd | Administrative & support | 2020 |
| L’Amour Properties (SW) Ltd | Real estate | 2025 |
| M & a Commercials (Bristol) Limited | Construction | 2010 |
| M & B Properties SW Ltd | Real estate | 2018 |
| M & B Utilities Limited | Construction | 2015 |
| M & C Food and Sauce Products Ltd | Wholesale & retail | 2026 |
| M & C Properties Ltd | Construction | 2017 |
| M & C Property Limited | Manufacturing | 2001 |
| M & D Hospitality Group Ltd | Hospitality | 2025 |
| M & D Investment Properties Ltd | Real estate | 2022 |
| M & D Plant & Groundworks Ltd | Construction | 2025 |
| M & E Vertical Services Limited | Construction | 2011 |
| M & G Countryside Development Limited | Agriculture & fishing | 2014 |
| M & J Properties (Bristol) Limited | Real estate | 2004 |
| M & K Johnson Ltd | Real estate | 2018 |
| M & LJ Property Services Ltd | Construction | 2024 |
| M & M Art Services Ltd | Information & communication | 2023 |
| M & M Brickwork Ltd | Construction | 2022 |
| M & M Drilling Ltd | Construction | 2010 |
| M & M Glass Company Limited | Construction | 1988 |
| M & M Trailers Limited | Wholesale & retail | 1992 |
| M & M Transport (Bristol) Ltd | Transport & logistics | 2017 |
| M & N Electrical (Bristol) Limited | Construction | 2003 |
| M & P Carpentry Limited | Construction | 2002 |
| M & P Holdings and Investments Limited | Professional & scientific | 2016 |
| M & R Civil Engineering Limited | Construction | 2014 |
| M & R LE Grand Limited | Real estate | 2018 |
| M & S Burge Limited | Wholesale & retail | 2014 |
| M & S Enterprises (South West) Ltd | Other services | 2015 |
| M & S Formwork Limited | Wholesale & retail | 2000 |
| M & T Fabrications Ltd | Manufacturing | 2013 |
| M a Burnett Ltd | Other services | 2019 |
| M a Catering Bristol Ltd | Hospitality | 2025 |
| M a Flanagan Limited | Administrative & support | 2011 |
| M a Howard Associates Ltd | Construction | 2013 |
| M a Kiimika Hires Ltd | Wholesale & retail | 2024 |
| M a Mehmood Ltd | Transport & logistics | 2025 |
| M a Newman Holdings Limited | Construction | 2023 |
| M a Please Ltd | Other services | 2025 |
| M and B Distribution Limited | Transport & logistics | 2005 |
| M and Co Properties Ltd | Real estate | 2025 |
| M and M Film Productions Limited | Information & communication | 2018 |
| M and M Tech Services Ltd | Manufacturing | 2026 |
| M and P Production Services Limited | Arts & recreation | 2013 |
| M and S Lettings and Property Management Ltd | Real estate | 2019 |
| M B Clarke & Sons Limited | Construction | 2008 |
| M B Estate Limited | Administrative & support | 1997 |
| M B Projects & Services Limited | Professional & scientific | 2016 |
| M Babbage & SON Ltd | Construction | 2019 |
| M Brookes Golf Ltd | Wholesale & retail | 2011 |
| M C & S H Cawley Limited | Education | 2005 |
| M C Auto Repairs Limited | Wholesale & retail | 2008 |
| M C Hullah & Company Limited | Professional & scientific | 2003 |
| M C Lettings Ltd | Real estate | 2016 |
| M C Whittle Ltd | Agriculture & fishing | 2020 |
| M Callaway Medical Imaging Ltd | Health & social care | 2015 |
| M Carhouse Limited | Wholesale & retail | 2024 |
| M D M Enterprises (Bristol) Ltd | Construction | 2017 |
| M D M Holdings Limited | Extraterritorial | 2019 |
| M D M Property Lettings Limited | Real estate | 2019 |
| M D S Painting & Decorating Ltd | Construction | 2014 |
| M D Williams Upholstery Limited | Other services | 2002 |
| M Day 2 Limited | Hospitality | 2005 |
| M E Amor Building Contractors Ltd | Construction | 2023 |
| M E Sports (South West) Limited | Arts & recreation | 2018 |
| M F Fencing Ltd | Administrative & support | 2026 |
| M F S Scaffolding Limited | Construction | 2015 |
| M FEY Carpets Limited | Construction | 2017 |
| M FOX Consulting Ltd | Information & communication | 2024 |
| M G Knife Services Limited | Professional & scientific | 2024 |
| M G Plumbing Limited | Construction | 2002 |
| M Garnet Limited | Real estate | 2024 |
| M H Customs Limited | Wholesale & retail | 2024 |
| M H Flat Roofing Limited | Construction | 2025 |
| M H Massey Roofing & Cladding Limited | Construction | 1999 |
| M Heywood Accountancy Limited | Professional & scientific | 2024 |
| M Hinder & Sons Ltd | Water & waste | 2026 |
| M Holmes Talent Ltd | Information & communication | 2026 |
| M I S Stores Bristol Ltd | Wholesale & retail | 2023 |
| M Interiors and Design Ltd | Construction | 2025 |
| M J Auto Engineers Ltd | Wholesale & retail | 2013 |
| M J B Shopfitting Limited | Construction | 2014 |
| M J Communications (Bristol) Limited | Information & communication | 2007 |
| M J Crawford Carpentry & Kitchen Fitting Ltd | Manufacturing | 2018 |
| M J Dalton Butchers Limited | Wholesale & retail | 2006 |
| M J Deliveries Limited | Transport & logistics | 2017 |
| M J Hardwick Traditional Building Services LLP | | 2019 |
| M J Kurton Limited | Construction | 2011 |
| M J Lawless Electrical Limited | Construction | 2004 |
| M J Patch (Group) Limited | Professional & scientific | 2001 |
| M J Property Services Ltd | Administrative & support | 2017 |
| M J Walton Limited | Construction | 2017 |
| M J Wittcomb Ltd | Construction | 2026 |
| M Jabbar Ltd | Hospitality | 2023 |
| M K Food and Wine Fishpond Ltd | Wholesale & retail | 2023 |