Abstract: Approaches for collaborative advertising bidding comprise receiving, from an ad exchange, a bid request for an advertisement space for a viewing user. The approaches further comprise retrieving logged data associated with the viewing user, the logged data corresponding to the viewing user's online exposure to web content including at least one of commercial webpages, online representations of services or products having purchase information, and advertisements. A first advertiser and a second advertiser who have entered into an advertising collaborating relationship to respond to bid requests are identified. A determination is made as to whether a portion of the retrieved logged data for the viewing user is associated with the first advertiser or with the second advertiser. Additionally, based on the determining, one of the first advertiser and the second advertiser is selected to submit a bid for the advertisement space in response to the bid request.