- M N Accountancy & Co
- M4 Facilities Management limited
- M4 Facilities Management limited
- Madihahs Childminding Services
- Maeve Shop
- Mahee Electronics
- Malayalee Association of the UK
- Manor Bangla Kitchen & Grill
- Manor Estate Agent
- Manor F & M Ltd
- Manor Glazing Ltd
- Marcomedia
- Marigold Services Ltd
- Marvel Consultancy LTD
- Mas Bazar
- Master Bright Limited
- Max Infotech UK Ltd
- MAXXICARE LTD
- Maysoon London
- McKenzie Homes
- Merit Tutors
- MH Solution Service Ltd
- Minhas Law Associates Ltd
- Mj hairdressers
- MjHhairdressers
- MJSA Law Ltd
- MMA (UK) Mobile Phones & Accessories
- MMM Group LTD
- Moneywise Investments Plc
- Moon Coffe & Restaurant
- Mouna's Kitchen
- Movement Solution London LTD
- MS dry cleaners ltd
- Muhammad's Pharmacy
- Munchy grill