| Michael Garside Consulting Ltd | Construction | 2020 |
| Midas UK Holdings Limited | Real estate | 2022 |
| Midnight FOX Solutions Ltd | Administrative & support | 2021 |
| Milehigh Investments Limited | Real estate | 2020 |
| Miles Benjamin Smith Limited | Extraterritorial | 2025 |
| Milestone Court Limited | Real estate | 2006 |
| Milk Teeth Productions Limited | Information & communication | 2023 |
| Milkhouse Creamery UK Ltd | Wholesale & retail | 2015 |
| Mill Holme Construction Limited | Construction | 2022 |
| Miller Associates Ltd | Financial services | 2006 |
| Mind Garden Holistics Ltd | Health & social care | 2022 |
| Mind the Mind Collective Ltd | Professional & scientific | 2025 |
| Mind the Trees (Yorkshire) Ltd | Agriculture & fishing | 2021 |
| Mindful and More Ltd | Other services | 2025 |
| Mini Marvels (Otley RD) Ltd | Education | 2025 |
| Misha Group Ltd | Real estate | 2026 |
| Misted Windows.Com Ltd | Construction | 2021 |
| MJ Capital Holdings Ltd | Households | 2022 |
| MJ Hester (Leeds) Ltd | Construction | 2016 |
| MJ3M Ltd | Wholesale & retail | 2025 |
| MJF Enterprise Investments Limited | Real estate | 2016 |
| MJF Enterprise Solutions Limited | Information & communication | 2015 |
| MJG Properties (Yorkshire) Ltd. | Real estate | 2025 |
| MJM Kitchens & Joinery Ltd | Manufacturing | 2023 |
| MK BIZ Analysis Limited | Information & communication | 2018 |
| MK Home Solutions Ltd | Real estate | 2025 |
| MK International Market Ltd | Wholesale & retail | 2025 |
| MK Mini Market Ltd | Wholesale & retail | 2026 |
| MK Structural Solutions Ltd | Manufacturing | 2026 |
| Mk-Viii Limited | Extraterritorial | 2015 |
| MKD Care Limited | Health & social care | 2023 |
| MKL Multi-Trade Limited | Construction | 2026 |
| MNW SAS Consultancy Ltd | Information & communication | 2015 |
| Mobile Car Repair Centre Ltd | Wholesale & retail | 2019 |
| Modular Link Limited | Construction | 2013 |
| Moes Barber Pudsey Ltd | Other services | 2026 |
| Mogul Emporium Ltd | Wholesale & retail | 2016 |
| Mondial Projects Limited | Construction | 2019 |
| Mondiale Projects (UK) Limited | Wholesale & retail | 2025 |
| Money Matters Leeds Limited | Real estate | 2020 |
| Monruth Healthcare Ltd | Health & social care | 2017 |
| Monson Development Ltd | Construction | 2026 |
| Monster Kidz Leeds Limited | Arts & recreation | 2015 |
| Monster Kidz Ltd | Arts & recreation | 2014 |
| Montrose Skin Clinic Ltd | Health & social care | 2026 |
| Moonlight Taverns Limited | Hospitality | 2018 |
| Moorfield Court (Holdings) Limited | Other services | 2009 |
| Moorfield Court (Leeds) Limited | Real estate | 1975 |
| Mosaic Church Limited | Other services | 2005 |
| Mosley-Carr Limited | Health & social care | 2019 |
| Mossfold (Development) Limited | Construction | 1982 |
| Mossfold Properties (Pudsey) Ltd | Construction | 2022 |
| Mouse and MOO Ltd | Information & communication | 2025 |
| Move Reels Ltd | Administrative & support | 2025 |
| Mozfit Ltd | Arts & recreation | 2019 |
| MR7 Properties Ltd | Hospitality | 2020 |
| MS Developments Yorkshire Ltd | Construction | 2021 |
| MS Install Ltd | Professional & scientific | 2024 |
| MS Worldwide Ltd | Wholesale & retail | 2025 |
| MSB Consult Limited | Professional & scientific | 2023 |
| MSM Electrical Solutions Ltd | Construction | 2022 |
| Mssb Holdings Ltd | Wholesale & retail | 2020 |
| Mssd Litigation Resolution Ltd | Financial services | 2024 |
| MTH Assets Limited | Real estate | 2025 |
| MTM Installations Ltd | Construction | 2024 |
| Mufaro Ltd | Public administration | 2020 |
| Muinin Capital Limited | Financial services | 2021 |
| Muinin Holdings Limited | Financial services | 2023 |
| Multirotorcraft Ltd | Wholesale & retail | 2012 |
| Muqadas Mustafa Ltd | Wholesale & retail | 2025 |
| Murphy Aggs Ltd | Water & waste | 2018 |
| Mutant Movement Ltd | Arts & recreation | 2018 |
| Mutiny Bar & Kitchen Limited | Hospitality | 2017 |
| Mvmnt Coaching Limited | Education | 2025 |
| MW Roofing (Leeds) Ltd | Construction | 2024 |
| My Dental Practice Limited | Financial services | 2024 |
| My Denture Clinic Ltd | Manufacturing | 2020 |
| My Food Place Ltd | Hospitality | 2019 |
| My Pilot LOG Limited | Information & communication | 2024 |
| My Spine Chiropractic Ltd | Other services | 2013 |
| Myba Properties Ltd | Real estate | 2025 |
| Mypec Limited | Other services | 2001 |
| Myva 86 Limited | Professional & scientific | 2025 |
| N Mumtaz Limited | Health & social care | 2013 |
| N&G Mechanical Services Ltd | Construction | 2022 |
| N&L Services Ltd | Transport & logistics | 2020 |
| N&M Foods Ltd | Wholesale & retail | 2023 |
| N.U Legacy Commercial Holdings Ltd | Real estate | 2026 |
| N.U Legacy Holdings Ltd | Real estate | 2025 |
| N100 Engineering Group Ltd | Professional & scientific | 2024 |
| NABLE2 Limited | Professional & scientific | 2022 |
| Naomi Murray Music Ltd | Arts & recreation | 2025 |
| Naylor Mechanical Services Limited | Construction | 2015 |
| NCM Recycling and Waste Solutions Limited | Water & waste | 2022 |
| Neami Ltd | Information & communication | 2025 |
| Nelec Limited | Construction | 2003 |
| Nestiva Wellness Ltd | Wholesale & retail | 2025 |
| NET Zero Consultancy Services Limited | Extraterritorial | 2023 |
| Nevada Homes Limited | Real estate | 2017 |
| New Life Resin Bound Specialists Limited | Construction | 2019 |