| Motto Contracting Ltd | Professional & scientific | 2019 |
| Motus TV Limited | Information & communication | 2012 |
| Moubles Limited | Information & communication | 2016 |
| Moulds, Patterns and Models Limited | Manufacturing | 1978 |
| Moulton Goodies Fund KCP1 L.P. | | 2007 |
| Mount Conferences Limited | Hospitality | 1990 |
| Mount Kinabalu Limited | Real estate | 2019 |
| Mount Machinery Limited | Professional & scientific | 2023 |
| Mount Pleasant (Framlingham) Management Company Limited | Real estate | 2010 |
| Mount Pleasant Assets Ltd | Construction | 2021 |
| Mount Pleasant Catering Limited | Hospitality | 2021 |
| Mount Royd (Bradford) Limited | Administrative & support | 1986 |
| Mount Royd Corporate Advisory Services Ltd | Information & communication | 2023 |
| Mountain Adventure Company Limited | Other services | 2007 |
| Mountain Compute Ltd | Information & communication | 2025 |
| Mountain Properties (Leeds) Ltd | Real estate | 2022 |
| Mountain Works Limited | Professional & scientific | 2026 |
| Mountainmania Ltd | Information & communication | 2026 |
| Mountains Plumbing Solutions Limited | Construction | 2012 |
| Mountfields (Clarendon Road) Management Company Limited | Real estate | 1981 |
| Mountstone Properties Ltd | Real estate | 2026 |
| Mountview (York) RTM Company Limited | Households | 2022 |
| Mourton Investments Limited | Real estate | 2022 |
| Mouse & Bear Ltd | Real estate | 2022 |
| Mouse AI Media Ltd | Information & communication | 2024 |
| Moustache Barbers Leeds Ltd | Other services | 2025 |
| Movari Limited | Information & communication | 2026 |
| Move 2 Move Property Management Ltd | Construction | 2023 |
| Move Like Zaza Ltd | Wholesale & retail | 2018 |
| Move on Accommodation Limited | Real estate | 2003 |
| Move on Building Services Ltd | Construction | 2017 |
| Move Same Day Limited | Wholesale & retail | 2020 |
| Move Scaff Ltd | Transport & logistics | 2026 |
| Move UP Lofts Ltd | Real estate | 2010 |
| Moveable Feast Productions | Arts & recreation | 2004 |
| Movemen Academy Ltd | Other services | 2026 |
| Movement Matters Corporate Ltd | Health & social care | 2024 |
| Movementsmatter Ltd | Health & social care | 2018 |
| Moves Made Affordable Ltd | Water & waste | 2024 |
| Movex Logistics Ltd | Transport & logistics | 2012 |
| Movida Property Group Ltd | Construction | 2021 |
| Movie House Limited | Hospitality | 2020 |
| Moving Matters (London) Limited | Education | 2013 |
| Mowbray Partners Limited | Professional & scientific | 2017 |
| Mowen Holdings Ltd | Real estate | 2024 |
| Mowen Properties Ltd | Real estate | 2024 |
| Mowgli's Mutts Ltd | Agriculture & fishing | 2022 |
| Mowi Scotland Pension Trust Limited | Administrative & support | 2006 |
| Moxee Limited | Administrative & support | 2023 |
| Moxi Consulting and Coaching Limited | Professional & scientific | 2022 |
| Moxie Marketing Solutions Ltd | Professional & scientific | 2025 |
| Moxon Field Advisory Ltd | Professional & scientific | 2020 |
| Moylan Insight Property Ltd | Real estate | 2019 |
| Moyna Services Ltd | Other services | 2016 |
| Moyoo Ltd | Transport & logistics | 2026 |
| Mozaic Industries Limited | Professional & scientific | 2004 |
| Mozindo Innovators Ltd | Wholesale & retail | 2023 |
| Mo’S Car Wash Limited | Administrative & support | 2020 |
| MP & RM Patterson Limited | Construction | 2005 |
| MP & Silva Limited | Arts & recreation | 2010 |
| MP Accountant Ltd | Professional & scientific | 2022 |
| MP Infrastructure Ltd | Professional & scientific | 2021 |
| MP Rail Services Ltd | Other services | 2015 |
| MP38 Electrical Ltd | Hospitality | 2021 |
| MPB Logistics Ltd | Administrative & support | 2020 |
| MPC34 Ltd | Transport & logistics | 2018 |
| Mpcc (UK) Limited | Manufacturing | 2008 |
| MPD Centre | Health & social care | 2009 |
| MPD Estates Limited | Real estate | 2022 |
| MPD Installations Limited | Construction | 2010 |
| Mpec Technology Limited | Manufacturing | 2000 |
| Mpero Limited | Wholesale & retail | 2023 |
| Mpes (Yorkshire) Limited | Construction | 2021 |
| MPF & Co Group Ltd | Construction | 2024 |
| MPF Testing Services Ltd | Information & communication | 2023 |
| MPG Morley Ltd | Wholesale & retail | 2018 |
| MPH (GB) Limited | Professional & scientific | 2004 |
| MPH Advisory Ltd | Professional & scientific | 2021 |
| MPH Electrical (Horsforth) Limited | Construction | 2006 |
| MPH Enterprises Limited | Professional & scientific | 2002 |
| MPL Family Limited | Financial services | 2024 |
| MPL Logistics Group Ltd | Transport & logistics | 2022 |
| MPL Services Group Limited | Construction | 2024 |
| MPM CAD Ltd | Professional & scientific | 2004 |
| MPM Combined Services Ltd | Construction | 2024 |
| MPM Ecommerce Ltd | Wholesale & retail | 2024 |
| MPM Estates Limited | Real estate | 2006 |
| MPM Group Holdings Limited | Financial services | 2023 |
| MPM Group Limited | Financial services | 2025 |
| MPM Joinery & Construction Ltd | Construction | 2026 |
| MPM Property Investments Limited | Real estate | 2023 |
| MPS Electrical Contractors Limited | Construction | 2009 |
| MPS Property (Leeds) Ltd | Real estate | 2020 |
| MPS Real Estates Ltd | Real estate | 2021 |
| Mpsy Properties Limited | Real estate | 2017 |
| MPT Properties 1984 Limited | Real estate | 2024 |
| MPV Solutions Limited | Information & communication | 2023 |
| MQ Developments Ltd | Real estate | 2020 |
| MQ MDJ Ltd | Construction | 2024 |
| MQ Pharma Ltd | Financial services | 2026 |