The holding company business has always involved a certain amount of constructive ambiguity about where, exactly, the client's interests end and the agency's begin. Stagwell's acquisition of Freestar, announced last month, suggests the ambiguity may be entering a new phase.

The deal brings Freestar, a publisher monetization company that serves more than 1,000 publishers and handles nearly a billion ad requests daily, into Stagwell's Owned Media division. This means Stagwell will now operate technology that helps publishers sell advertising inventory — the same inventory that Stagwell's agencies help advertisers buy.

The immediate logic is tidy enough. Stagwell owns travel publisher Ink and the airport television network ReachTV, both of which are expected to use Freestar for programmatic sales. The acquisition also builds on Stagwell Curate, a marketplace the company introduced in July to package publisher inventory before bidding. Together, the pieces give Stagwell more control over how advertising opportunities are assembled, presented and sold.

Mark Penn, Stagwell's chairman and chief executive, has been explicit about the economics: agencies face pressure to improve margins while proving that more of an advertiser's budget reaches working media. Owning infrastructure can reduce reliance on outside vendors and retain revenue previously earned by intermediaries.

(Whether those savings flow to advertisers, or simply change the address to which the checks are mailed, is a separate question.)

The transparency concerns are familiar ones, raised previously when Publicis Groupe acquired LiveRamp. Can buying teams demonstrate why a Freestar-connected publisher was selected? Are clients told when Stagwell earns revenue from both the buying and selling sides of a transaction? Publishers, meanwhile, will want assurances that Freestar continues to prioritize their revenue rather than Stagwell's demand.

Financial terms of the deal were not disclosed, which is itself a kind of answer to how much holding companies enjoy disclosing.

Original story published in Digiday: "Stagwell’s Freestar deal brings buying and selling under one roof", by Ronan Shields