| Muyibabz Ltd | Health & social care | 2015 |
| Muzed Limited | Wholesale & retail | 2009 |
| Muzzy's Autos Limited | Wholesale & retail | 2023 |
| Mvecare Health Solutions Ltd | Health & social care | 2017 |
| Mvestment Limited | Real estate | 2019 |
| MVM Consultancy Ltd | Professional & scientific | 2024 |
| Mvne LLP | | 2020 |
| Mvpngn Ltd | Information & communication | 2023 |
| Mvpv Ltd | Wholesale & retail | 2024 |
| MVR Enterprise Ltd | Professional & scientific | 2025 |
| MVS (Research) Limited | Extraterritorial | 1984 |
| MW Childcare Ltd | Health & social care | 2025 |
| MW Cloud Solutions Ltd | Information & communication | 2026 |
| MW Investing Ltd | Financial services | 2025 |
| MW Wind Services Ltd | Construction | 2025 |
| Mw-W Group Ltd | Professional & scientific | 2021 |
| MWA Property Limited | Real estate | 2022 |
| MWB Developments Limited | Construction | 2024 |
| MWC Rope Access Ltd | Professional & scientific | 2019 |
| Mwenya Mwenya Ltd. | Professional & scientific | 2015 |
| Mwja & Co Ltd | Households | 2025 |
| MWK Cooling Solutions Ltd | Construction | 2025 |
| Mwpes Ltd | Professional & scientific | 2018 |
| MWR Audio Limited | Information & communication | 2024 |
| MX DE N Limited | Real estate | 2018 |
| MX Developments Limited | Construction | 2014 |
| MX2 Developments Limited | Real estate | 2023 |
| Mxms Developments Ltd | Construction | 2022 |
| My Acai Ltd | Hospitality | 2024 |
| My Backyard International Limited | Real estate | 2017 |
| My BAD EYE Films Limited | Information & communication | 2019 |
| My Brand Protector Limited | Administrative & support | 2026 |
| My Bucketlist Adventures Ltd | Administrative & support | 2024 |
| My Build Solutions Ltd | Construction | 2021 |
| My Business Coach (Rugby) Limited | Professional & scientific | 2021 |
| My Business Coach Limited | Professional & scientific | 2019 |
| My Business Group Holdings Limited | Administrative & support | 2024 |
| My Caresupport Ltd | Health & social care | 2025 |
| My Chicken Express Ltd | Hospitality | 2025 |
| My Clean Energy Ltd | Construction | 2024 |
| My COS Health Ltd | Other services | 2026 |
| My Driving Club Ltd | Wholesale & retail | 2024 |
| My Eco Energi Services Ltd | Construction | 2025 |
| My EDU Study Limited | Education | 2019 |
| My Epona Limited | Information & communication | 2025 |
| My Eyez Ltd | Wholesale & retail | 2025 |
| My Fathers Heart Limited | Manufacturing | 2004 |
| My Festival Wedding Limited | Administrative & support | 2015 |
| My Finance Club Limited | Financial services | 2010 |
| My First Choice Limited | Wholesale & retail | 2025 |
| My Fitness Management Limited | Other services | 2023 |
| My Garden Kitchen M.G.K Ltd | Hospitality | 2023 |
| My Generation Gifts Limited | Wholesale & retail | 2011 |
| My Ghar Ltd | Real estate | 2024 |
| My IP Protector Limited | Administrative & support | 2026 |
| My JOB Hub Limited | Administrative & support | 2012 |
| My Landlord Cares Ltd | Real estate | 2020 |
| My Landlord Cares Property Management Ltd | Real estate | 2024 |
| My Legal Matters Limited | Administrative & support | 2021 |
| My Life Project CIC | Arts & recreation | 2013 |
| My Local PUB Ltd | Hospitality | 2023 |
| My Optic Ltd | Wholesale & retail | 2025 |
| My PAD Group Ltd | Administrative & support | 2011 |
| My PAD Resin & Landscaping Limited | Administrative & support | 2025 |
| My Place Property Consultants Limited | Other services | 2012 |
| My POD Home Limited | Real estate | 2014 |
| My Security and FM Ltd | Administrative & support | 2023 |
| My Static Life Ltd | Information & communication | 2026 |
| My Supported Living Limited | Real estate | 2024 |
| My Surfacing Group Ltd | Construction | 2024 |
| My Trading Ltd | Wholesale & retail | 2016 |
| My Travel Guys Limited | Administrative & support | 2016 |
| My Tribe Training Ltd | Arts & recreation | 2020 |
| My Trips Ltd | Administrative & support | 2024 |
| My Turnkey Ltd | Households | 2026 |
| My X Dream Limited | Wholesale & retail | 2022 |
| Myautocompanion Ltd | Information & communication | 2025 |
| Mybuddy Ltd | Information & communication | 2025 |
| Mycel Consulting Limited | Professional & scientific | 2023 |
| Mycelium Network Ltd | Professional & scientific | 2022 |
| Mycelium Strategy Consulting Limited | Professional & scientific | 2024 |
| Myco Print Limited | Manufacturing | 2013 |
| Mycognition Limited | Information & communication | 2011 |
| Mycumortgage Ltd | Financial services | 2026 |
| Myddleton Group (KX) Ltd | Real estate | 2018 |
| Myddleton Group (Totteridge ) Ltd | Real estate | 2017 |
| Myddleton Group Ltd | Real estate | 2015 |
| Mydelivery Pharma Ltd | Health & social care | 2021 |
| MYE Consultancy Services Limited | Professional & scientific | 2025 |
| Myers Cavendish LLP | | 2010 |
| Myers Grove Management Company Limited | Households | 2023 |
| Myers Plumbing & Heating Ltd | Construction | 2020 |
| Myers Property Rentals Limited | Real estate | 2025 |
| Myeyescan Limited | Health & social care | 2018 |
| Mygym Limited | Arts & recreation | 2014 |
| Myhrtoolkit Limited | Administrative & support | 2005 |
| Mykyle Properties Limited | Real estate | 2025 |
| Mylife Disability Hub CIC | Education | 2023 |
| Mylnhurst Limited | Education | 1996 |
| Mylnhurst Merlins Limited | Education | 2014 |