Foursquare did the work. The buyer's decision sat one link further on.

On 18 September 2026, Infillion announced it will buy Foursquare. Terms were not disclosed. The trade press read the deal as ad-tech consolidation: another location business folded into a stack that already holds MediaMath's demand-side platform, bought out of bankruptcy in 2023 for $22 million, and Catalina, the purchase-data company Infillion bought in February. The consolidation is real. It says less about what Infillion is paying for than about who has been paying for location data, and for what.

Foursquare is easy to underrate as a supplier of raw pings. It started in 2009 as a check-in app and spent the following decade building on top of that raw location data: inferring which shop a phone is standing in, turning those inferences into visits, and selling the visits as measurement. In February 2016 it launched Attribution, which tells an advertiser whether a campaign sent people into stores. In 2019 it bought Placed, the store-visit attribution company, from Snap. Snap had paid $185.9 million for it in 2017; its filings show $77.8 million in cash coming back two years later, part of it for severance and equity awards. By 2022 Foursquare was adding online sales to the same reports, using the advertiser's own conversion data. The company did the enrichment itself, and did it well.

What it did not hold was the till. An advertiser buying in-store measurement is deciding where next quarter's budget goes, and what that decision really turns on is whether the campaign sold anything. The sale is recorded in the retailer's system, not Foursquare's. So Foursquare measured the closest thing it could see: the visit. For online sales it borrowed the advertiser's data. For the shelf, the record sat with the retailers, and in the last decade the retailers learned to sell it themselves. A retail media network measures a campaign against its own shoppers' baskets, wherever the ad ran.

Rob Emrich, Infillion's founder and executive chairman, pitches the deal against exactly that shift: "Walled gardens and retailer apps can only measure what happens inside their own environments." Catalina is Infillion's answer to it. Infillion describes Catalina as a purchase record spanning seventy retail banners and 130 million US households, gathered from checkout systems and licensing agreements, and Infillion's chief operating officer has said Catalina's data will eventually be available only through Infillion's platform. Add Foursquare's visits, and once the deal closes Infillion will hold the ad, the visit and a cross-retailer purchase record under one owner. Joining them is real work, and whether the retailers' licences allow it is still to be shown.

The usual rule is that value goes to whoever does the work on the data, not whoever merely holds it. Foursquare did the work and still hit a ceiling, because the work only pays up to the decision it is pointed at. I call that first choice the call: which buyer decision your data exists to answer. It is the first of the five decisions a data business makes, and it sets the size of everything after it. Foursquare got the rest right. It did its own enrichment, sold directly to its customers, and kept its share of what visit measurement earned. But the size of that pie was set by the call, and Foursquare's call answered the budget question with a stand-in: the visit instead of the sale. Once retailers could answer the same question with the sale itself, the visit was competing with the thing it stood in for. Better visit data could narrow that gap, never close it. If Foursquare left value on the table, what I call under-capture, it was in the call, not in the work.

Placed is the one store-visit attribution business with a public price history, and it lost more than half its price in two years. One company doesn't prove a market, but it is the direction you would expect.

Infillion says Foursquare will keep its brand and keep selling to its customers, including those on competing ad platforms. AdExchanger added "for now, at least". Catalina's path is already stated. The agencies and platforms that built measurement on Foursquare visits will, once the deal closes, be buying from a company that also runs a demand-side platform, and whether Foursquare follows Catalina is for Infillion to decide.

The lesson for an operator sits before any deal. Owning the enrichment protects your share of the value. The size of the value is set by the call, and the call can move to data you do not hold.

Most data businesses count their buyers. The better count is how many steps their data sits from the decision those buyers are paid to make.