DoorDash Buys Instacart as Stagwell Picks Up Freestar in Weekly M&A

DoorDash agreed to buy Instacart on Thursday, capping a week in which Stagwell also acquired publisher ad-tech firm Freestar — two deals that could reshape how marketers buy retail media and open web inventory.

The DoorDash-Instacart transaction was in advanced talks when AdExchanger recorded its weekly podcast and became official on Thursday. Pending approval, DoorDash Ads and Instacart's Carrot Ads will likely combine into a single retail media offering.

Carrot Ads is not a standard ad unit. It also runs a white-labeled retail media business that recently signed GoPuff as a customer. That layering — a delivery platform buying a grocery platform whose ad tech already powers another retailer's media business — prompted AdExchanger's comparison to Russian nesting dolls, or a whale eating a shark eating a fish.

Why does retail media consolidation matter to marketers?

Retail media remains extremely fragmented. Mergers among retailers could de-fragment the space, even slightly, and change how marketers work with retail media companies, according to AdExchanger senior editor James Hercher, who discussed the deal's implications on the podcast.

Fewer, larger retail media partners would simplify buying for brands that currently juggle dozens of incompatible platforms.

What does Stagwell want with Freestar?

The week's other deal raises a different question: why would an independent agency holding company buy a business that helps open web publishers set up their ad stacks?

AdExchanger managing editor Anthony Vargas, who covered the acquisition, pointed to the hints the companies dropped. The most concrete: Freestar's 1,000 publisher site connections could support Stagwell's principal media business, in which the agency commits its own capital to media buys.

Direct access to a thousand publisher relationships gives an agency principal-media operation inventory scale it would otherwise have to buy through intermediaries.

Is this 2006 all over again?

The structure invites a historical comparison. GroupM bought ad network 24/7 Real Media 19 years ago — an agency buying media supply, much as Stagwell is doing now. AdExchanger frames the question as whether Stagwell-Freestar is a rehash of that deal or something genuinely new.

The answer will determine whether the industry sees more agencies acquiring ad-tech supply-side assets.

AdExchanger's own framing splits the week's deals into two camps: acquisitions that feel like "a yin meeting a yang" and those that feel like "stitching together a Frankenstack." Which camp each deal falls into is the question marketers, publishers and retail media buyers will be answering as both transactions move toward closing and integration.