- The i PaperMedia, music & games · 201058
- i-DMedia, music & games · 198045
- ibis HotelsTravel & hotels · 197458
- IBMTech & gadgets · 191179
- IcelandShops & marketplaces · 1970
- ICGBanks, insurance & finance · 198982
- iD MobileEnergy, telecoms & utilities · 2015
- Ideal StandardHome & design · 190179
- IG GroupBanks, insurance & finance · 197467
- IGNMedia, music & games · 199670
- IHG Hotels & ResortsTravel & hotels · 200355
- IKEAHome & design · 194388
- Ilford PhotoTech & gadgets · 1879
- IllamasquaBeauty & grooming58
- The Illustrated London NewsMedia, music & games · 184258
- illyDrinks · 1933
- IlmorCars, bikes & motorbikes · 198364
- Imagination TechnologiesTech & gadgets · 198576
- IMDbApps & fintech · 1990
- Imperial LeatherBeauty & grooming67
- InchcapeCars, bikes & motorbikes · 1847
- The IndependentMedia, music & games · 198676
- Industrial RecordsMedia, music & games · 1976
- IneosEnergy, telecoms & utilities · 199864
- InformaMedia, music & games · 199864
- Innis & GunnDrinks · 200279
- innocentDrinks · 199967
- InstagramMedia, music & games
- InstaxTech & gadgets · 199861
- International Airlines GroupTravel & hotels · 201170
- Interscope RecordsMedia, music & games · 198964
- IntertekBusiness & industry · 188539
- Introversion SoftwareMedia, music & games · 200136
- InvestecBanks, insurance & finance · 197473
- Irn-BruDrinks · 190173
- Islamic Bank of BritainBanks, insurance & finance · 200476
- Isle of Wight FestivalArts, culture & events · 196858
- Isomorphic LabsBusiness & industry · 202155
- itsuRestaurants & cafés · 199755
- ITVMedia, music & games · 195567
- ITVXApps & fintech · 200864
- The IvyRestaurants & cafés · 192961
- IWGBusiness & industry · 198964
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