- UberApps & fintech · 200970
- Uber EatsApps & fintech · 201576
- Ubisoft ReflectionsMedia, music & games · 198445
- UK Power NetworksEnergy, telecoms & utilities · 201067
- Ultima SportsCars, bikes & motorbikes · 199727
- UmbroSport & fitness · 192067
- Under ArmourFashion & accessories · 1996
- Unicorn GroceryShops & marketplaces · 199658
- UNILADMedia, music & games · 2010
- UnileverBusiness & industry · 192976
- UniqloFashion & accessories · 1984
- United BiscuitsFood · 194864
- United UtilitiesEnergy, telecoms & utilities · 199548
- Universal Music GroupMedia, music & games · 193467
- Urban DecayBeauty & grooming · 1996
- USCShops & marketplaces · 198964
- uSwitchBanks, insurance & finance · 200070
- UTVMedia, music & games · 195961
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