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
Foursquare has done a decade's worth of enrichment work on its own — assembling 100M+ POIs, 16 billion verified check-ins and 250M U.S. device signals into an MRC-accredited visitation product — and Infillion is buying that enriched asset outright to sit alongside its Catalina purchase data.
From Foursquare's seat, the rake ends: the asset is sold once for cash and there is no ongoing owned rake to defend — this is the cleanest sell there is, matching the Nvidia/Hugging Face and Anthropic/Coefficient Bio rulings.
The buyer's decision Infillion is pointing this at is whether a specific ad impression drove a store visit and a downstream purchase; Foursquare's substrate is worth something specifically because it is one of very few scaled, independently-collected sources able to say what happened in the physical world once combined with Catalina's household-level purchase records.
The entire location dataset and the Foursquare brand cross permanently to Infillion; nothing is retained by prior Foursquare shareholders, though Foursquare will keep operating as an independent brand and selling data to competing ad platforms — the boundary here is around the target's shareholders, not around the asset.
Not determinable — terms were not disclosed; the only public reference points are Foursquare's ~$412M raised and $450M 2019 valuation versus a ~20–25% revenue/headcount uplift for Infillion, which does not settle whether the seller under- or over-captured.
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
- Citi launches Citi Commerce Media, a commerce media platform built on 6.5 billion annual credit-card transactions2026-09-23
- 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 · Added to the register 2026-09-20