| Matthew Hatcher Flooring Limited | Construction | 2013 |
| Matthew Lane Limited | Construction | 2013 |
| Matthew Mcgiffen Ltd | Information & communication | 2023 |
| Matthew O'Sullivan Engineering Limited | Information & communication | 2018 |
| Matthew Richard Martin Limited | Arts & recreation | 2012 |
| Matthew Salter Services Limited | Education | 2012 |
| Matthews and SON Motor Company Limited | Wholesale & retail | 2013 |
| Matthews Carpentry and Build Ltd | Construction | 2021 |
| Matthews Consultants Ltd | Professional & scientific | 2024 |
| Matthews Industrial Roofing Contractors Limited | Construction | 2021 |
| Matthews Property Group Ltd | Real estate | 2022 |
| Matthews Roofing (Bristol) Ltd | Construction | 1996 |
| Matthews Stonemasonry Ltd | Construction | 2025 |
| Matthias Home Kitchen Ltd | Hospitality | 2026 |
| Mattiola LP | | 2015 |
| Mattrans Logistics Ltd | Transport & logistics | 2018 |
| Matty M Logistics Ltd | Transport & logistics | 2025 |
| Maud Noah Media Limited | Information & communication | 2025 |
| Maude-Roxby Ltd | Financial services | 2020 |
| Mauds Stables Limited | Professional & scientific | 2021 |
| Maudsley Property Limited | Real estate | 2024 |
| Maughan Consultancy Services Limited | Information & communication | 2015 |
| Maurice LAY Distributors Limited | Wholesale & retail | 1986 |
| Maurynskollect Ltd | Wholesale & retail | 2023 |
| MAV IT Contract Services Limited | Information & communication | 2012 |
| Mavai Ltd | Professional & scientific | 2026 |
| Mave Space Ltd | Real estate | 2025 |
| Mavelon Studio Ltd | Health & social care | 2025 |
| Maven Consultancy (UK) Limited | Professional & scientific | 2014 |
| Maven Medical Limited | Health & social care | 2022 |
| Mavenhive Ltd | Information & communication | 2025 |
| Mavilista Limited | Households | 1978 |
| Mavrec Group Ltd | Wholesale & retail | 2026 |
| Mawas Services Limited | Construction | 2022 |
| Mawda Barbers Limited | Other services | 2024 |
| Mawdsley's BER Limited | Manufacturing | 2004 |
| Mawgan Lavender Ltd | Professional & scientific | 2025 |
| MAX & Marley Limited | Wholesale & retail | 2023 |
| MAX Binary Limited | Other services | 2019 |
| MAX Carey Woodturning Trust | Education | 2008 |
| MAX Credit Investment Limited | Administrative & support | 2008 |
| MAX Dropshipping Ltd | Wholesale & retail | 2025 |
| MAX Eco Limited | Administrative & support | 2024 |
| MAX Events (Paintball) Limited | Arts & recreation | 2005 |
| MAX Events Ltd | Arts & recreation | 2002 |
| MAX Events Properties Ltd | Hospitality | 2017 |
| MAX FAX Medical Limited | Health & social care | 2011 |
| MAX Freight Group Ltd | Financial services | 2023 |
| MAX Freight Ltd | Transport & logistics | 2022 |
| MAX Group Investments Ltd | Real estate | 2022 |
| MAX HOY Limited | Professional & scientific | 2008 |
| MAX Jones Finance Ltd | Professional & scientific | 2011 |
| MAX JR Limited | Professional & scientific | 2010 |
| MAX Minerva's Ltd | Wholesale & retail | 2018 |
| MAX Security Systems (Bristol) Limited | Administrative & support | 2011 |
| MAX Work Ltd | Professional & scientific | 2022 |
| Maxandroses Ltd | Real estate | 2017 |
| Maxcomp Limited | Professional & scientific | 2019 |
| Maxed Media Ltd. | Professional & scientific | 2011 |
| Maxem Marketing Limited | Information & communication | 2019 |
| Maxema Limited | Information & communication | 2008 |
| Maxi BOI Ltd | Construction | 2020 |
| Maxi Lounge Ltd | Hospitality | 2023 |
| Maxillary Ltd | Wholesale & retail | 1999 |
| Maxim Integrated Products UK Limited | Manufacturing | 1984 |
| Maxim Property Maintenance Services Ltd | Construction | 2009 |
| Maximi Projects Ltd | Professional & scientific | 2025 |
| Maximillian Melling Ltd | Information & communication | 2018 |
| Maximum Damp Solutions Ltd | Construction | 2025 |
| Maximum Earth Group Ltd | Energy | 2022 |
| Maximum Traders (Bristol) Limited | Construction | 2015 |
| Maximus Rigorous Ltd | Construction | 2014 |
| Maxine's Pristine Clean Limited | Administrative & support | 2018 |
| Maxitech Consulting Limited | Information & communication | 2023 |
| Maxmat Limited | Manufacturing | 2016 |
| Maxplow Limited | Health & social care | 2019 |
| Maxres Ltd | Public administration | 2022 |
| Maxtoke Ltd | Administrative & support | 2013 |
| Maxwell TPG Limited | Wholesale & retail | 2020 |
| Maxwells Salon Ltd | Other services | 2020 |
| Maxx Group Services Ltd | Construction | 2018 |
| Maxxcorp Ltd | Education | 2023 |
| Maxxiom Capital Limited | Construction | 2025 |
| Maxxit Ltd | Information & communication | 2025 |
| MAY & Mabel Ltd | Manufacturing | 2023 |
| MAY & Vaste Professionals Limited | Professional & scientific | 2024 |
| MAY Aswell Ltd | Manufacturing | 2014 |
| MAY House (Bristol) Limited | Real estate | 2015 |
| MAY Productions Ltd | Arts & recreation | 2019 |
| Maya Contractor Ltd | Manufacturing | 2024 |
| Maya Dance and Fitness Ltd | Arts & recreation | 2025 |
| Maya Gandaia Ltd | Wholesale & retail | 2020 |
| Maya Luxe Productions Limited | Wholesale & retail | 2025 |
| Mayaro Engineering Limited | Professional & scientific | 2005 |
| Mayaverse Ltd | Information & communication | 2025 |
| Maycroft Homes Limited | Construction | 2011 |
| Mayday Marketing UK Ltd | Professional & scientific | 2016 |
| Mayes Building & Construction Limited | Construction | 2017 |
| Mayes Green (Goodmayes) Management Company Limited | Households | 1985 |
| Mayfair Capital Asset Management Ltd | Administrative & support | 2017 |