| More Solutions Limited | Information & communication | 2002 |
| More-Energy Care Services Ltd | Health & social care | 2014 |
| Morepower Engineering Consultants Limited | Professional & scientific | 2016 |
| Morgan Blue Town Limited | Other services | 1987 |
| Morgan DEI Ltd | Real estate | 2021 |
| Morgan Hayward Limited | Construction | 2017 |
| Morgan Huzzey & Sons Limited | Extraterritorial | 1987 |
| Morgan Lincoln Limited | Financial services | 2016 |
| Morgan Music Company Limited | Arts & recreation | 1966 |
| Morgan Property Holdings Limited | Real estate | 2016 |
| Morgan&Mcgovern Ltd | Real estate | 2026 |
| Morgans Rentals Limited | Real estate | 1998 |
| Morisco Limited | Construction | 2019 |
| Morjaria Interim Management Ltd | Professional & scientific | 2012 |
| Morleys MK Ltd | Hospitality | 2023 |
| Morning DEW MK Limited | Real estate | 2019 |
| Morpari Ltd | Real estate | 2025 |
| Morpheus and Co (Design) Ltd | Professional & scientific | 2016 |
| Morrck Limited | Manufacturing | 2004 |
| Morris TM Ltd | Construction | 2024 |
| Morrisco Cross Water Project Management Services Ltd | Construction | 2019 |
| Morrisco Local Ltd | Wholesale & retail | 2019 |
| Morrisco’S Property Ltd | Real estate | 2025 |
| Morrisperiperi Ltd | Hospitality | 2025 |
| Morrow Payments Ltd | Financial services | 2026 |
| Mors Health Limited | Public administration | 2018 |
| Morse Designed Limited | Professional & scientific | 2024 |
| Morse Rentals Limited | Real estate | 2024 |
| Mortar Nova Grand Avenue LLP | | 2017 |
| Mortgage Processing Services Ltd | Financial services | 2022 |
| Mory Homes and Services Ltd | Hospitality | 2025 |
| Mosaic Art Studio UK Ltd | Wholesale & retail | 2024 |
| Mosaic Case Management and Therapies Ltd | Health & social care | 2026 |
| Mosaic Consultancy Services Ltd | Information & communication | 2022 |
| Mosaic Gold Ltd | Information & communication | 2019 |
| Mosaic Hotels Limited | Hospitality | 2018 |
| Mosaic Wise CIC | Administrative & support | 2012 |
| Moscha Technologies Limited | Information & communication | 2024 |
| Moshao Ltd | Health & social care | 2012 |
| Moshel Ltd | Real estate | 2022 |
| Moss Bros Holdings Limited | Real estate | 2016 |
| Moss Edge Support Services Limited | Administrative & support | 2022 |
| Mosscliff Environmental Limited | Professional & scientific | 2007 |
| Mossgraft Ltd | Administrative & support | 2025 |
| MOT Direct Ltd | Professional & scientific | 2025 |
| MOT Plus MK Ltd | Wholesale & retail | 2024 |
| MOT TEC Ltd | Wholesale & retail | 2024 |
| Mot-Mk Limited | Wholesale & retail | 2022 |
| MOT1V8 Limited | Information & communication | 2018 |
| Motel Linus Gallery Limited | Arts & recreation | 2022 |
| Motexx Services Limited | Wholesale & retail | 2016 |
| Motgal Ltd | Wholesale & retail | 2020 |
| Mothers Summit | Professional & scientific | 2010 |
| Motify Ltd | Manufacturing | 2019 |
| Motion Hydraulics Ltd | Professional & scientific | 2021 |
| Motion Plus Limited | Professional & scientific | 2006 |
| Motivation Direct Ltd | Wholesale & retail | 2009 |
| Motive Components Limited | Wholesale & retail | 1983 |
| Motivene Ventures Limited | Financial services | 2022 |
| Moto Movement Ltd | Wholesale & retail | 2023 |
| Motor Connectors Ltd | Wholesale & retail | 2023 |
| Motor Insurers' Bureau | Administrative & support | 1946 |
| Motor Insurers' Information Centre | Administrative & support | 1998 |
| Motor Trade Selection Limited | Professional & scientific | 2002 |
| Motorhouse Group Limited | Wholesale & retail | 2016 |
| Motoring Research Limited | Information & communication | 2002 |
| Motorline (Broad Oak) Limited | Wholesale & retail | 2016 |
| Motorline (Canterbury) Limited | Wholesale & retail | 2012 |
| Motorline (Kent) Limited | Wholesale & retail | 2003 |
| Motorline (UK) LLP | | 2007 |
| Motorline Holdings Limited | Administrative & support | 2005 |
| Motorline Limited | Administrative & support | 1984 |
| Motorline TPS Limited | Wholesale & retail | 2016 |
| Motornomic Ltd | Information & communication | 2024 |
| Motors MD Ltd. | Wholesale & retail | 2017 |
| Motorsport Competitions Ltd | Wholesale & retail | 2020 |
| Motra Finance Ltd | Financial services | 2024 |
| Motte Consulting Ltd | Information & communication | 2014 |
| Mottram Josammy Ltd | Wholesale & retail | 2025 |
| Motus Creative Ltd | Professional & scientific | 2022 |
| Moulas Accountancy Ltd | Professional & scientific | 2018 |
| Moulas Properties Ltd | Real estate | 2026 |
| Mount Carmel Kindergarden Limited | Health & social care | 2024 |
| Mount Mill Farm Limited | Agriculture & fishing | 2025 |
| Mount Verdi Limited | Wholesale & retail | 2019 |
| Mount Verdi Trading Limited | Administrative & support | 2025 |
| Mountain Lodge Hotels Limited | Hospitality | 1998 |
| Mountview Holdings Limited | Real estate | 2015 |
| Mourya Consulting Limited | Information & communication | 2015 |
| Mova Private Limited | Professional & scientific | 2008 |
| Movehub Limited | Administrative & support | 2020 |
| Movematic Ltd | Wholesale & retail | 2024 |
| Movestrong Limited | Other services | 2021 |
| Moviegears Media Limited | Information & communication | 2017 |
| Moving Fast Ltd | Construction | 2022 |
| Moving Intelligence PAY Ltd | Professional & scientific | 2023 |
| Movingbricks Group Ltd | Real estate | 2019 |
| Movinglife UK Ltd | Manufacturing | 2021 |
| Movingme Ltd | Real estate | 2011 |
| Mowermans SON Ltd | Wholesale & retail | 2025 |