A transaction account provider may obtain transaction information from consumer transactions and information from a consumer browsing a transaction account provider website, collectively first-party data. A web server may obtain second-party data from a consumer's use of a merchant website. Additional third-party data may be purchased from a third-party data source. An ad server may use the first-party data, the second-party data, and the third-party data to select a relevant personalized banner ad to be displayed to the consumer.