| LÖV Leaf Limited | Wholesale & retail | 2021 |
| M & N Herbert Property Co Ltd | Real estate | 2022 |
| M a Powell Limited | Real estate | 2002 |
| M a Savage Limited | Construction | 2002 |
| M and M Direct Limited | Wholesale & retail | 2004 |
| M E Jones Haulage Limited | Transport & logistics | 2013 |
| M Field Services Limited | Extraterritorial | 2025 |
| M I Davidson Construction Ltd | Construction | 2021 |
| M J Mark UK Limited | Manufacturing | 2008 |
| M J Meredith Orchard Services Limited | Agriculture & fishing | 2017 |
| M J P Trading Limited | Wholesale & retail | 1996 |
| M P Home Improvements Ltd | Construction | 2023 |
| M Plant Asset Hire Ltd | Professional & scientific | 2022 |
| M Sharry Ltd | Information & communication | 2024 |
| M W Pullen (Plumbing & Heating) Limited | Construction | 2003 |
| M&D Home Specialist Car Valeting Ltd | Wholesale & retail | 2025 |
| M&P Comms Limited | Information & communication | 2015 |
| M&R Luxury Glamping Limited | Hospitality | 2026 |
| M&R Perrott Properties Ltd | Real estate | 2023 |
| M&S Facades Ltd | Construction | 2022 |
| M,S Mobiles Limited | Wholesale & retail | 2015 |
| M-Blast IND Shot Blasting Ltd | Manufacturing | 2017 |
| M-Spray Industrial Coating Ltd | Manufacturing | 2019 |
| M.A Brickwork & Construction Ltd | Construction | 2022 |
| M.A. Williams Accountancy Ltd | Professional & scientific | 2007 |
| M.C.Rawlings Building Conservation Ltd | Construction | 2020 |
| M.I.M. Services Limited | Administrative & support | 1998 |
| M.J.L. Engineering Limited | Other services | 1997 |
| M.K.B. Evapco. Ltd | Wholesale & retail | 2008 |
| M.L.P Laser Templating Ltd | Professional & scientific | 2021 |
| M3 Auto Hereford Ltd | Wholesale & retail | 2015 |
| M4R Limited | Professional & scientific | 2000 |
| M80 Media Ltd | Administrative & support | 2025 |
| Maata Properties Limited | Real estate | 2015 |
| Mackay and Evans Ltd | Wholesale & retail | 2023 |
| Maclellan Consult Ltd | Professional & scientific | 2024 |
| Macleod Heating Limited | Construction | 2024 |
| Macleod Property Holdings Limited | Real estate | 2024 |
| Macman Catering Ltd | Hospitality | 2020 |
| MAD BAD and Dangerous 2 Know Limited | Professional & scientific | 1999 |
| Maddie Wade Ltd | Information & communication | 2018 |
| Maddy's Garages Ltd | Transport & logistics | 2020 |
| Madley's Mighty MIX Ltd | Hospitality | 2023 |
| Maelec Ltd | Construction | 2024 |
| Magal Freeholdings Limited | Households | 2024 |
| Magal Properties Limited | Construction | 2007 |
| Magazin Timisoara Limited | Wholesale & retail | 2020 |
| Magenta IT Ltd | Professional & scientific | 2015 |
| Magenta Technology Limited | Information & communication | 1995 |
| Magic Scissors Hereford Ltd | Other services | 2024 |
| Magico Properties Limited | Real estate | 2016 |
| Magix Builder Ltd | Construction | 2022 |
| Magna Provision Limited | Wholesale & retail | 2025 |
| Mahady Consultants Limited | Real estate | 2014 |
| Mahady Developments Ltd | Real estate | 2018 |
| Mahady Investment Limited | Other services | 2015 |
| Maitland Consulting Limited | Professional & scientific | 2025 |
| Maiz Tattoo Club Ltd | Other services | 2022 |
| Majestic London Apartments Ltd | Real estate | 2008 |
| Make-It Happen Creative Dreams Ltd | Wholesale & retail | 2024 |
| Making Dough Ltd | Hospitality | 2020 |
| Making HAY Limited | Professional & scientific | 2025 |
| Mako Roofing Solutions Ltd | Construction | 2022 |
| Maliant Technologies Limited | Information & communication | 2025 |
| Mallocron Labs Ltd | Information & communication | 2026 |
| Malu LIN Swayne Limited | Arts & recreation | 2003 |
| Malvern Art Products Limited | Manufacturing | 1985 |
| Malvern Construction & Roofing Ltd | Construction | 2016 |
| Mamma Jammas Limited | Hospitality | 2014 |
| Mammoth Books Limited | Wholesale & retail | 2020 |
| Mamut Farm Cleaning Ltd | Agriculture & fishing | 2025 |
| Manchester 2 LLP | | 2018 |
| Manchester Robotics Limited | Professional & scientific | 2020 |
| Manco 61 Francis Street Management Limited | Professional & scientific | 2023 |
| Mandy Green Leadership Ltd | Education | 2022 |
| Maneki Ramen (Birmingham) Ltd | Hospitality | 2024 |
| Manicom Limited | Professional & scientific | 1999 |
| Mansoori Foods Limited | Hospitality | 2024 |
| Mantella Palace Limited | Hospitality | 2021 |
| Manu-Mech Engineering Services Limited | Construction | 1998 |
| MAP Wealth Limited | Financial services | 2018 |
| Mapec Properties Limited | Real estate | 2016 |
| Maple (236) Limited | Households | 2004 |
| Maple (276) Limited | Administrative & support | 2005 |
| Maple (375) Limited | Households | 2014 |
| Maple (412) Limited | Households | 2016 |
| Maple (444) Limited | Households | 2018 |
| Maple (480) Limited | Households | 2022 |
| Maple Bay Properties Ltd | Real estate | 2019 |
| Maple Court Management (Hereford) Limited | Households | 1987 |
| Maple Tree Rentals Limited | Administrative & support | 2015 |
| Marber Group Limited | Professional & scientific | 2016 |
| Marble & Granite Designs Ltd | Manufacturing | 2013 |
| March Hare Consulting Limited | Professional & scientific | 2021 |
| Marches Assessment Group Limited | Education | 2019 |
| Marches Books Limited | Wholesale & retail | 2020 |
| Marches Counselling Service Limited | Health & social care | 2010 |
| Marches Family Network | Health & social care | 1995 |
| Marches Global Holdings Limited | Financial services | 2022 |
| Marches Global Investments Limited | Financial services | 2023 |