- M&S BankBanks, insurance & finance · 198545
- M-SportCars, bikes & motorbikes · 197964
- MAC CosmeticsBeauty & grooming · 198470
- The MacallanDrinks · 1824
- MacduffDrinks · 196233
- Macmillan PublishersMedia, music & games · 184352
- Madame TussaudsArts, culture & events · 183979
- MaggiFood · 188679
- Magners Irish CiderDrinks · 193570
- Magnet KitchensShops & marketplaces · 191873
- MagnumFood · 198976
- Majestic WineShops & marketplaces · 1980
- Man GroupBanks, insurance & finance · 178370
- Manchester AirportTravel & hotels · 193470
- Manchester Art GalleryArts, culture & events · 1824
- Manchester Evening NewsMedia, music & games · 1868
- MangoFashion & accessories · 198467
- Manson Guitar WorksTech & gadgets · 197042
- Manx TelecomEnergy, telecoms & utilities · 1987
- Mappin & WebbFashion & accessories · 177561
- Marks & SpencerShops & marketplaces · 188479
- MarmiteFood · 190276
- Marriott InternationalTravel & hotels · 1993
- MarsFood · 193273
- MarshallTech & gadgets · 196279
- Marston'sDrinks · 183467
- Martin-BakerBusiness & industry · 193473
- Marv StudiosMedia, music & games · 199755
- MaseratiCars, bikes & motorbikes · 191461
- MastercardBanks, insurance & finance · 196676
- MatalanFashion & accessories · 198564
- MatchboxCars, bikes & motorbikes · 195367
- Matches FashionFashion & accessories · 1987
- MathmosHome & design · 196355
- Mauds Ice CreamRestaurants & cafés67
- Max FactorBeauty & grooming · 190955
- MaybellineBeauty & grooming · 191579
- MazdaCars, bikes & motorbikes · 192058
- McArthurGlen GroupShops & marketplaces · 199376
- McDonald'sRestaurants & cafés · 194061
- McKinsey & CompanyBusiness & industry · 1926
- McLarenCars, bikes & motorbikes · 198552
- McVitie'sFood · 183058
- Meantime BreweryDrinks · 200055
- Media MoleculeMedia, music & games · 200661
- MediatonicMedia, music & games · 200545
- Melrose IndustriesBanks, insurance & finance · 2003
- MemriseApps & fintech · 201082
- MendeleyApps & fintech · 200852
- Mercedes-BenzCars, bikes & motorbikes · 192670
- Merlin EntertainmentsMedia, music & games · 199867
- MerseyrailTravel & hotels
- MetroMedia, music & games · 199967
- Metro BankBanks, insurance & finance · 201073
- MG MotorCars, bikes & motorbikes · 200552
- Michael PageBusiness & industry · 197676
- MicrosoftTech & gadgets · 197564
- Midcounties Co-operativeShops & marketplaces · 200555
- MieleTech & gadgets · 189964
- Millie'sRestaurants & cafés · 198558
- MINICars, bikes & motorbikes · 196976
- Ministry of SoundMedia, music & games · 199170
- Mitchells & ButlersRestaurants & cafés · 1898
- MITIE GroupBusiness & industry · 198782
- Mitre Sports InternationalSport & fitness · 181776
- Mitsubishi MotorsCars, bikes & motorbikes · 197064
- MixmagMedia, music & games · 198358
- Mobico GroupTravel & hotels · 197255
- Mojang StudiosMedia, music & games · 200973
- Molton BrownBeauty & grooming · 197367
- Mondi GroupBusiness & industry · 196779
- MoneseApps & fintech · 201567
- Monica VinaderFashion & accessories · 2002
- Monkey ShoulderDrinks73
- Monmouth CoffeeDrinks · 197870
- MonocleMedia, music & games · 200773
- Monsoon AccessorizeShops & marketplaces · 197355
- Monster EnergyDrinks · 2002
- MONY GroupApps & fintech · 1993
- MonzoApps & fintech · 201591
- MoonpigShops & marketplaces · 200064
- Moorhouse'sDrinks · 186552
- Morgan Motor CompanyCars, bikes & motorbikes · 190961
- Morgan Sindall GroupBusiness & industry · 197776
- Morgan StanleyBanks, insurance & finance · 200867
- Morleys StoresShops & marketplaces · 189776
- Morning StarMedia, music & games · 193042
- MorphsuitsShops & marketplaces · 200970
- Morphy RichardsTech & gadgets · 193667
- MorrisonsShops & marketplaces · 189961
- Mortlach DistilleryDrinks · 182379
- Moss Bros GroupFashion & accessories · 185173
- MothercareShops & marketplaces · 196170
- MotownMedia, music & games · 195961
- Mott MacDonaldBusiness & industry · 1902
- Mountain WarehouseShops & marketplaces · 1997
- Moy ParkFood52
- Moët & ChandonDrinks · 1743
- Mr KiplingFood · 196758
- MR PORTERShops & marketplaces
- MTVMedia, music & games · 199755
- MubiMedia, music & games · 200773
- MUJIHome & design
- MulberryFashion & accessories · 197170
- MumsnetMedia, music & games · 200058
- Mute RecordsMedia, music & games · 197864
- MyproteinFood · 200467
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