What is first-party data?
First-party data is information a business collects directly from the people who interact with it. That includes purchases and orders, website and app behavior, email and SMS engagement, loyalty program activity, customer service interactions, and records in a CRM. The business owns the relationship, so it owns the data.
It sits alongside other types of data. Zero-party data is what customers deliberately tell a brand, second-party data is another company's first-party data shared through a partnership, and third-party data is collected by outside companies that don't have a direct relationship with the customer.
How is first-party data collected and used?
| Source | Example data | Common uses |
|---|---|---|
| Website and app | Page views, add-to-carts, sign-ups | Conversion tracking, personalization |
| Transactions | Orders, revenue, returns | ROI measurement, customer value |
| CRM and sales systems | Leads, pipeline, closed deals | Connecting media to business outcomes |
| Email, SMS, and loyalty | Opens, clicks, membership tier | Retention, audience building |
| Customer service | Tickets, feedback | Product and experience improvements |
First-party data becomes most useful when it's connected. Joined with media data, it shows which spend drove real sales or pipeline. Sent to ad platforms server-to-server, it improves measurement and optimization. Kept in one governed place, it gives marketing, sales, and finance the same view of the customer.
What is an example of first-party data?
Connecting leads to closed deals
A B2B company runs LinkedIn campaigns that generate leads. Platform reports show cost per lead, but not which leads became customers.
By bringing its own CRM data in alongside media data, the company sees which campaigns produced closed deals and revenue, not just form fills, and shifts budget toward the campaigns that drive real pipeline.
First-party vs. second-party vs. third-party data
| First-party data | Second-party data | Third-party data | |
|---|---|---|---|
| Who collects it | The business itself | A partner, from its own customers | Outside companies and aggregators |
| Relationship with the customer | Direct | The partner's | None or indirect |
| Accuracy and relevance | High | High for the partner's audience | Varies |
| Durability as privacy rules tighten | Strongest | Depends on the agreement | Weakest |
| Typical use | Measurement, personalization, audiences | Partnerships, co-marketing | Reach and enrichment |
Why does first-party data matter now?
Browser restrictions, ad blockers, operating system changes, and privacy regulation have weakened the third-party tracking marketing once relied on. First-party data is the signal a business still controls.
- More reliable measurement. Outcomes come from the business's own systems, not only from what a browser pixel reports.
- A fuller view of ROI. Media spend can be tied to sales, pipeline, and customer value.
- Better audiences. Targeting and planning start from real customers, not assumptions.
- Privacy still applies. First-party data needs consent management and clear practices around how it's collected and used.
How does Alli do this?
Alli by PMG's Datasources brings first-party systems such as Salesforce and Adobe, plus proprietary data sets, in alongside media data from ad platforms and analytics tools. That lets teams connect media activity to downstream outcomes like leads, pipeline, and sales, for a fuller view of ROI and customer value.
Going the other way, Alli Audience Gateway sends first-party conversion events server-to-server to ad platforms' Conversions APIs, so measurement and optimization hold up as browser tracking gets less reliable. It doesn't replace consent management or legal review.
Explore Alli DatasourcesFirst-party data FAQ
What are examples of first-party data?
Purchase history, website and app behavior, email engagement, loyalty program activity, customer service records, and CRM data such as leads and closed deals.
What is the difference between first-party and third-party data?
First-party data is collected directly by a business from its own customers. Third-party data is collected by outside companies with no direct relationship to those customers, and it is more affected by privacy changes.
Is first-party data privacy compliant?
It can be, when it's collected with appropriate notice and consent and used in line with applicable law. Owning the data doesn't remove the need for consent management.
How do you activate first-party data?
Common approaches include sending conversion events to ad platforms server-to-server, building audiences from customer data, and joining it with media data to measure ROI.
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