The Difference Between First-Party and Third-Party Data

Direct answer: First-party data is information a company collects directly from you through your own interaction with its product or service; third-party data is information collected by one company and sold or licensed to others who have no direct relationship with you — and the industry is shifting toward first-party data as browser tracking restrictions make third-party data harder to collect.

First-party data: a direct relationship

When you create an account, make a purchase, or use an app, the company you're interacting with collects first-party data. You generally know this is happening because you took an action with that specific company.

Third-party data: no direct relationship

Third-party data comes from companies you've never interacted with directly — data brokers, ad-tech intermediaries, and licensing partners who aggregate information from many sources and sell access to it.

Why the shift toward first-party data matters

Browser-level restrictions on cross-site tracking have made third-party data harder and more expensive to collect at scale, pushing advertisers toward building direct first-party relationships (loyalty programs, account sign-ins, email lists) instead of buying broker data.

What this means for you

First-party relationships are generally more transparent — you know what you agreed to when you signed up — while third-party data flows are largely invisible to the person the data describes, which is exactly why data broker opt-out tools exist.

Frequently Asked Questions

Is first-party data safer than third-party data?

Not necessarily safer, but more transparent — you typically know when you're providing first-party data because it involves a direct interaction, whereas third-party data collection happens without your visibility or explicit involvement.

Why are advertisers moving toward first-party data?

Browser-level restrictions on cross-site tracking have made third-party data collection harder and more expensive, pushing advertisers to build direct relationships through loyalty programs and account sign-ins instead.

Can a company have both first-party and third-party data about me?

Yes — a company might collect first-party data from your direct use of its product, then supplement that with third-party data purchased from a broker to enrich your profile further.