| Monthsbeeshow Ltd | Other services | 2025 |
| Montis Transport Ltd | Transport & logistics | 2018 |
| Montpellierbuild Ltd | Administrative & support | 2019 |
| Montrose Health Group Limited | Health & social care | 2022 |
| Montrose Retreats Ltd | Health & social care | 2022 |
| Monty Pubs Ltd | Hospitality | 2018 |
| Monty Time Rush Ltd | Administrative & support | 2026 |
| Monument Photographic Laboratories Limited | Extraterritorial | 1984 |
| MOO LAB (Holdings) Ltd | Hospitality | 2019 |
| Moochin Ltd | Real estate | 2026 |
| Mood Light Pictures Ltd | Arts & recreation | 2023 |
| Mood Mental Health Training Ltd | Professional & scientific | 2023 |
| Mood Professional Services Limited | Wholesale & retail | 2009 |
| Moody Electrical Contractors Limited | Construction | 2025 |
| Moody Property Ltd | Real estate | 2025 |
| Mookat Ltd | Information & communication | 2012 |
| Moon Cafe Ltd | Hospitality | 2024 |
| Moon Chai Ltd | Other services | 2023 |
| Moon Management Limited | Arts & recreation | 2009 |
| Moon MFG Limited | Information & communication | 2021 |
| Moon Palace Restaurant Limited | Hospitality | 2022 |
| Moon River Lodge Limited | Administrative & support | 2009 |
| Moonbeam Associates Ltd | Administrative & support | 2014 |
| Mooney Asset Management Limited | Real estate | 2014 |
| Moonfleet Angling Limited | Professional & scientific | 2012 |
| Moonhills Holdings Ltd | Wholesale & retail | 2022 |
| Moonko Ltd | Wholesale & retail | 2013 |
| Moonlandingz Limited | Arts & recreation | 2016 |
| Moonlight Cleaning (Student Services) Ltd | Administrative & support | 2011 |
| Moonlight Global Enterprise Limited | Hospitality | 2024 |
| Moonlight Residences Ltd | Real estate | 2026 |
| Moonlite Events Ltd | Hospitality | 2025 |
| Moonpod Limited | Information & communication | 2003 |
| Moonshine & Fuggles Ltd | Wholesale & retail | 2020 |
| Moonstar Digital Marketing Ltd | Professional & scientific | 2018 |
| Moor Bags & Kids Limited | Wholesale & retail | 2025 |
| Moor Estates Limited | Real estate | 2022 |
| Moor Ideas the Merrier Ltd | Professional & scientific | 2021 |
| Moor Prints | | 1984 |
| Moor View Croft Management Company Limited | Construction | 2015 |
| Moor View Golf Centre Limited | Arts & recreation | 1995 |
| Moorbrook Limited | Financial services | 2023 |
| Moorcroft & SON ARC Limited | Wholesale & retail | 2012 |
| Moorcroft Accountancy Limited | Professional & scientific | 2008 |
| Moore & Rock Specialists Tiling Contractors Ltd | Construction | 2012 |
| Moore & Wright (Sheffield) Limited | Extraterritorial | 1997 |
| Moore & Wright Limited | Manufacturing | 1997 |
| Moore and Moore Restaurants Ltd | Hospitality | 2019 |
| Moore Answers Development Limited | Information & communication | 2013 |
| Moore Azata Limited | Professional & scientific | 2023 |
| Moore Engage Limited | Administrative & support | 2000 |
| Moore Health & Fitness Limited | Arts & recreation | 2013 |
| Moore Heat & Plumbing Ltd | Construction | 2022 |
| Moore Insight One Limited | Professional & scientific | 2026 |
| Moore Insight SAP Limited | Professional & scientific | 2023 |
| Moore Noise Limited | Information & communication | 2009 |
| Moore Optima Limited | Information & communication | 2022 |
| Moore Space Limited | Real estate | 2014 |
| Moore Stephens Insight Limited | Professional & scientific | 2012 |
| Moore Street Securities Limited | Administrative & support | 1990 |
| Moore Transformation Limited | Professional & scientific | 2024 |
| Moore's Carpets and Flooring Limited | Wholesale & retail | 2010 |
| Moores Funerals Limited | Other services | 2008 |
| Moorgate Acoustics (Sheffield) Limited | Wholesale & retail | 1997 |
| Moorgate Acoustics Limited | Extraterritorial | 1981 |
| Moorgate Apartments Limited | Households | 2018 |
| Moorgate Court Management Company Limited | Households | 1983 |
| Moorgate OKS Ltd | Real estate | 2025 |
| Moorgate View Property Management Limited | Households | 2006 |
| Moorgate Villas Management Company Limited | Households | 2004 |
| Moorhead Medical Limited | Health & social care | 2021 |
| Moorland Medical Limited | Health & social care | 2018 |
| Moorside (Sheffield) Management Company Limited | Real estate | 1987 |
| Moorside Anaesthesia Ltd | Health & social care | 2022 |
| Moorside Vehicles Ltd | Wholesale & retail | 2023 |
| Moorthorpe Property Lettings Ltd | Real estate | 2026 |
| Moortown Building Services Ltd | Construction | 2017 |
| Moorviewhire Limited | Other services | 2015 |
| Moorville Developments Limited | Health & social care | 2008 |
| Moorwood Assets Limited | Real estate | 2013 |
| Moorwood Care Group Limited | Construction | 2013 |
| Moorwood Electrical Design and Installation Limited | Construction | 2000 |
| Moorwood Electrical Services Limited | Construction | 2013 |
| Moorwood Farm Group Ltd | Financial services | 2024 |
| Moorwood Livery Ltd | Agriculture & fishing | 2024 |
| Moorwood Padel Ltd | Wholesale & retail | 2026 |
| Moorwood Reinforcement Limited | Manufacturing | 2010 |
| Moorwood Stays Ltd | Hospitality | 2024 |
| Moosify Ltd | Wholesale & retail | 2025 |
| Moot Works Ltd | Professional & scientific | 2025 |
| Moove Properties Limited | Real estate | 2024 |
| Mopp Sheff Ltd | Other services | 2026 |
| Mor&Mor Ltd | Wholesale & retail | 2026 |
| Morad a 2 Z Ltd | Transport & logistics | 2025 |
| Moral AI Ltd | Professional & scientific | 2026 |
| Moran INK Ltd | Professional & scientific | 2015 |
| Moran Residential Surveying Ltd | Professional & scientific | 2021 |
| Morar Billericay Ltd | Health & social care | 2025 |
| Morar Care Home Stratford Ltd | Health & social care | 2019 |
| Morar Frinton Ltd | Health & social care | 2025 |