AirCheck Australia has compared the advertisements played on 80 DAB+ stations, finding Coles topped the list with over 17,000 spots placed on 69 digital stations.
Coles Radio WA played more ads for its own brand than any other station, airing 1,976 spots during the six-week period.
Sprite was the second most aired brand with 13,065 instances across 51 stations. National Tiles followed in third place with 11,215 ads on 29 DAB+ stations nationwide.
During this time, 763,996 ads went to air on digital radio in Sydney, Melbourne, Brisbane, Adelaide and Perth.
Comparing markets by instance, Brisbane was out in front, accounting for almost a quarter of all digital radio advertising airing 190,784 spots in this time.