What is First-party data?
First-party data is information a brand collects directly from its own customers and prospects — website behavior, purchase history, email engagement, app usage, survey responses, and account profile fields. It contrasts with third-party data (purchased from data brokers, built from cross-site cookies) and second-party data (a partner's first-party data shared via formal agreement). First-party data has become the central pillar of modern marketing for three reasons: Apple's App Tracking Transparency (2021) collapsed iOS third-party tracking; Google completed third-party cookie deprecation in Chrome through 2024–2025; and GDPR/CCPA enforcement has raised the legal cost of third-party data sourcing. Brands that built robust first-party data programs — email lists, logged-in product experiences, post-purchase surveys, loyalty programs — now run 40–60% cheaper paid acquisition because their lookalike seeds, retargeting pools, and creative personalization run on cleaner inputs.
Key statistics
- Brands with mature first-party data programs see 40–60% lower paid acquisition costs than third-party-reliant peers (BCG/Google 2024 study).
- Apple's ATT (2021) and Chrome cookie deprecation (2024–2025) eliminated most cross-site identity signals — first-party data is the durable replacement.
- 67% of CMOs rank first-party data strategy as a top-3 budget priority in 2025 (Gartner CMO Spend Survey).