Infillion acquires Foursquare to pair location visitation data with Catalina purchase data for ad attribution
Infillion is acquiring Foursquare, announced 18 September 2026, terms undisclosed. The deal joins Foursquare's 16 billion check-ins and 250M-device U.S. coverage with Catalina's household purchase records, which Infillion bought in February 2026. One owner can now link an ad impression to a store visit and a till transaction, ending Foursquare's prior sale of visitation data to rival agencies and platforms.
What happened
- Announced 18 September 2026; Infillion (NY, ~650 FTE, ~$61.2M 2024 revenue per Latka) acquires Foursquare (~150 FTE, ~$412M raised, $450M valuation at its 2019 round led by A16Z, USV, Microsoft); terms not disclosed.
- Foursquare's substrate: 100M+ points of interest across 200 countries, 16 billion human-verified check-ins, aggregated coverage of 250M U.S. devices.
- Infillion already owns Catalina purchase intelligence (acquired Feb 2026), Gimbal location tech, MediaMath (bought out of bankruptcy for $22M in 2023), TrueX, Drawbridge and UberMedia; Foursquare is the second major data acquisition in seven months.
- Rob Emrich (Infillion Founder & Executive Chairman) frames the deal as measuring 'what happens in the physical world' outside walled gardens; Gary Little (Foursquare CEO) says Foursquare 'adds significant new real-world outcome data' to a platform 'that can serve customers at scale'.
- Members of Foursquare's leadership team will join Infillion's Data Business Unit after close; the consumer apps Swarm and Superlocal are under review, with open-source, partnership and other options being weighed.
- Foursquare's prior model — selling visitation data and measurement to all agency holding companies and to major mobile apps and AI systems — implicitly ends inside Infillion's perimeter, or continues under a new owner that also runs a DSP.
Who is involved
New York ad tech company (formerly true[X]/SocialVibe) building an integrated media buying, measurement and data platform; already owns Catalina purchase data and Gimbal location data, and is the acquirer here.
~650 full-time employees pre-deal; Latka estimates 2024 revenue at ~$61.2M (private); prior acquisitions include MediaMath (out of bankruptcy for $22M in 2023), Catalina (Feb 2026), TrueX, Gimbal, UberMedia
B2B location intelligence platform holding 100M+ points of interest across 200 countries, 16 billion human-verified check-ins and aggregated coverage of 250M U.S. devices; the target whose data asset is the price of this deal.
~150 employees; has raised ~$412M in debt and equity per PitchBook, valued at $450M after a $150M 2019 round; investors include Andreessen Horowitz, Union Square Ventures, Microsoft; terms of the Infillion deal not disclosed
The reading
The enrichment work - structuring 16B check-ins, 100M+ POIs and 250M U.S. device signals into visitation measurement products, and then joining them to Catalina's household purchase data for attribution - was done inside Foursquare and will continue inside Infillion's new Data Business Unit run by Foursquare's SVP of sales Lindsey Kintner, per Axios. From Foursquare's seat at announcement, this is a one-shot sale of the asset itself.
Priced on the data asset: Infillion acquires the entirety of Foursquare, which keeps selling its data as an independent brand including to advertisers on competing ad platforms (Axios). Terms were not disclosed, so the price Foursquare's shareholders captured against the ~$282M-$412M raised and the 2019 $450M mark cannot be verified from public facts.
The payers here are advertisers who buy Infillion's measurement and targeting; the Foursquare substrate feeds their concrete decision - which campaigns, placements and creative to keep funding - by joining a visit signal to Catalina's purchase signal to test whether an impression drove an in-store trip. Infillion's own framing is that walled gardens and retailer apps can only measure inside their own environments, so the cross-environment visit-to-purchase link is the specific gap the data closes.
What crossed is the whole company - the POI graph, the check-in corpus, the device-signal panel and the Pilgrim/Places tooling - in a change-of-control transaction; Foursquare CEO Gary Little is not joining, while most of ~150 staff and the sales leadership are. What did not cross is any continuing claim by Foursquare's prior shareholders on downstream advertiser revenue, and the future of consumer apps Swarm and Superlocal is explicitly left open.
Not determinable from public facts: terms were not disclosed, so there is no way to compare the price paid to the stream of attribution revenue Infillion expects when the Foursquare asset is combined with Catalina's 130M-household purchase panel.
Why it matters
The acquisition looks like a textbook priced-on-the-asset sale from Foursquare's seat — the substrate and the brand cross for cash, no ongoing rake is retained by prior shareholders — but the more interesting question is what Infillion is paying for: not visitation data as such, which was already on the market, but the ability to sit visitation next to Catalina purchase inside one perimeter and price the combined attribution product. The thesis reads cleanly here: value goes where the work is, and the work Infillion is now positioned to do — closing the loop from impression to visit to purchase — was work Foursquare could not do alone with the substrate it held.
The argument this deal tests: Foursquare did the work. The buyer's decision sat one link further on.
Related deals
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- Simon Property launches Simon Media Network across 200+ US shopping destinations using first-party visit and commerce data2026-09-01
- Best Buy and Amazon expand Fire TV pact, opening Insignia TV ad inventory to Best Buy Ads via Amazon Ads tech2026-09-23
- Circana launches Liquid Mix with Google Meridian, combining Google's MMM framework with Circana's first-party data2026-09-08
Sources
- infillion.com — primary
- axios.com — party background
- adexchanger.com — party background
- ppc.land — party background
Announced 2026-09-18