Is Third-Party Data Going Away? What Businesses Must Know

Third-party data is information collected about individuals by organizations that have no direct relationship with those individuals. A data broker, an advertising network, or a tracking platform collects behavioral signals across multiple websites and sells or shares that data with businesses for targeting, analytics, and audience profiling. For decades, third-party cookies made this process seamless and scalable. That infrastructure is now breaking down. Privacy regulations, browser policy changes, and shifting consumer expectations have made third-party data one of the most contested resources in modern marketing.

What Is Third-Party Data and Why Does It Matter?

Third-party data is any data collected by an entity that does not have a direct relationship with the person the data describes. The "third party" is an intermediary — a data broker, an ad network, or a tracking service — sitting between the consumer and the business that eventually uses the data.

Businesses use third party data for four primary purposes. First, audience targeting—reaching users who match a demographic or behavioral profile without building that audience from scratch. Second, personalization—tailoring content, ads, and product recommendations to individual preferences. Third, market research—understanding industry trends, competitor audiences, and consumer behavior at scale. Fourth, B2B data enrichment — appending firmographic or contact data to internal CRM records.

Third-party data became valuable because it offered scale. A business launching a new product could immediately target millions of relevant consumers without waiting years to build its own data asset. For performance marketers, that speed was decisive.

The problem is that third-party data was largely invisible to the people it described. Consumers did not know which organizations held their data, how it was collected, or what it was used for. Regulators noticed. That is what triggered the regulatory and technical changes now reshaping the entire data ecosystem.

What Is Third-Party Data and Why Does It Matter?

Third-party data is any data collected by an entity that does not have a direct relationship with the person the data describes. The "third party" is an intermediary — a data broker, an ad network, or a tracking service — sitting between the consumer and the business that eventually uses the data.

Businesses use third party data for four primary purposes. First, audience targeting—reaching users who match a demographic or behavioral profile without building that audience from scratch. Second, personalization—tailoring content, ads, and product recommendations to individual preferences. Third, market research—understanding industry trends, competitor audiences, and consumer behavior at scale. Fourth, B2B data enrichment — appending firmographic or contact data to internal CRM records.

Third-party data became valuable because it offered scale. A business launching a new product could immediately target millions of relevant consumers without waiting years to build its own data asset. For performance marketers, that speed was decisive.

The problem is that third-party data was largely invisible to the people it described. Consumers did not know which organizations held their data, how it was collected, or what it was used for. Regulators noticed. That is what triggered the regulatory and technical changes now reshaping the entire data ecosystem.

What Is First-Party Data vs Third-Party Data?

First-party data and third party data differ in one fundamental way: who collected the data and how.

First-party data is information a business collects directly from its own audience. A customer makes a purchase. A user signs up for an email list. A visitor fills out a form on a company website. The business owns that data. The individual knowingly provided it. The consent relationship is direct and documented.

Third-party data is collected by someone else entirely. A data broker aggregates purchase behavior, location signals, browsing history, and demographic information from hundreds of sources—none of which are the business that eventually buys the data. The individual whose data is being sold typically has no knowledge of the transaction.

The practical difference matters for two reasons. First, first-party data is legally safer. The business collected it directly, with consent, under a clear privacy policy. Third party data carries inherited risk—if the broker collected it improperly, the business using it can still be held liable. Second, first-party data is more accurate. It reflects real behavior from real customers. Third party data is often aggregated, modeled, or inferred—which means it can be wrong.

A study by the Advertising Research Foundation (ARF) found that third-party audience data accuracy rates vary significantly across providers, with some demographic segments matched at rates as low as 59%. For US marketers building campaigns on audience targeting, that gap in accuracy has real cost implications. 

Why Is Third-Party Data Changing?

Third party data is changing because the two systems that made it possible — browser-based tracking and loosely regulated data brokerage—are both under pressure simultaneously.

Browser makers moved first. Apple Safari introduced Intelligent Tracking Prevention (ITP) in 2017, which restricted third-party cookie lifespans and cross-site tracking on all Apple devices. Mozilla Firefox followed with enhanced tracking protection. Browser makers moved first.

Apple Safari introduced Intelligent Tracking Prevention (ITP) in 2017, which restricted third-party cookie lifespans and cross-site tracking on all Apple devices. Mozilla Firefox followed with enhanced tracking protection.

Google pivotally altered its technical roadmap for Chrome—the browser used by approximately 65% of internet users globally, according to StatCounter. Instead of executing a mandatory, full deprecation of third-party cookies, Google shifted to a 'user choice' architecture, giving users explicit control to block tracking via browser settings. While this avoids an outright engineering shutdown, the practical impact is a steep, ongoing decline in addressable third party data. 

Regulators moved in parallel. The Federal Trade Commission (FTC) has intensified scrutiny of data broker practices. In 2023, the FTC took action against data broker Kochava for selling precise geolocation data that could be used to track individuals to sensitive locations, including reproductive health clinics and places of worship. That case signaled a material shift in how the FTC interprets consumer harm in the context of third party data.

At the state level, US privacy law is expanding rapidly. At the state level, US privacy law is expanding rapidly. More than 20 US states have now enacted comprehensive consumer privacy legislation, according to trackers maintained by the International Association of Privacy Professionals (IAPP). Each law places new restrictions on how businesses collect, share, and sell personal data—directly affecting the third party data supply chain. Each law places new restrictions on how businesses collect, share, and sell personal data—directly affecting the third party data supply chain.

Consumer sentiment is reinforcing the regulatory direction. A 2023 Pew Research Center survey found that 81% of Americans feel they have little to no control over the data companies collect about them. That loss of trust is a business risk independent of regulatory exposure.

How Cookie Deprecation and Privacy Laws Are Reshaping Data Collection

The third-party cookie was the primary mechanism for cross-site tracking. When a user visited a website, advertising networks embedded cookies in the browser. Those cookies followed the user across the web, building a behavioral profile that could be sold to advertisers. Mozilla Firefox blocked third-party cookies by default in 2019.

Apple Safari introduced Intelligent Tracking Prevention, which effectively eliminated third-party cookie tracking on iOS and macOS devices. Google opted to pivot from a mandatory phase-out of third-party cookies to an opt-in 'user choice' model in Chrome—the browser used by approximately 65% of global internet users, according to StatCounter. This model gives consumers direct, structural control over whether cookies can track them across the web.

Two major privacy regulations reshaped the legal standard simultaneously. The General Data Protection Regulation (GDPR), enforced by data protection authorities across the European Union, requires explicit, informed consent before personal data can be collected or processed. The California Consumer Privacy Act (CCPA), enforced by the California Privacy Protection Agency (CPPA), gives California residents the right to opt out of the sale of their personal information. Both regulations apply to third party data practices directly.

Consumer expectations have shifted in parallel. A 2023 Cisco Consumer Privacy Survey found that 81% of respondents said the way an organization handles personal data affects their willingness to buy from it. Businesses that rely on third party data now face reputational risk alongside regulatory risk.

What Should Businesses Do Instead of Relying on Third-Party Data?

Businesses should build data strategies centered on first-party and zero-party data. First-party data is information collected directly from customers through owned channels—website behavior, purchase history, email engagement, and customer service interactions. Zero-party data is information customers share proactively—survey responses, preference settings, and declared interests.

The transition requires four concrete actions.

Build direct data collection infrastructure. Invest in CRM systems, customer data platforms (CDPs), and email programs that capture consented first-party signals at every customer touchpoint.

Use consent management platforms (CMPs). Tools such as OneTrust or Cookiebot enable businesses to collect, record, and manage user consent in compliance with GDPR and CCPA requirements. Consent must be granular, freely given, and withdrawable.

Explore privacy-preserving alternatives. Google's Privacy Sandbox initiative introduced technologies such as the Topics API, which allows interest-based advertising without exposing individual browsing data to advertisers. Contextual advertising — placing ads based on the content of the page rather than the profile of the user — is a proven alternative already used widely in publisher environments.

Invest in data partnerships. Second-party data—first-party data shared directly between two organizations with a formal agreement—offers scale without the compliance risk of purchasing from a broker. Retail media networks, such as those operated by Amazon Advertising and Walmart Connect, provide access to consented purchase data within a controlled environment.

What Common Mistakes Do Businesses Make When Moving Away from Third-Party Data?

Most businesses understand that third party data is changing. Fewer are taking the steps needed to adapt before the transition forces their hand. These are the most common mistakes — and what they look like in practice.

• Waiting too long to adapt. Many marketing teams continue running third-party-data-dependent campaigns while treating the transition as a future problem. By the time restrictions fully take effect, they have no first-party data infrastructure in place and no consented audience to target.

• Collecting data without proper consent. Businesses implement new data collection tools—CDPs, tracking pixels, lead capture forms—without pairing them with compliant consent mechanisms. Under GDPR, collecting personal data without a lawful basis is a violation. The Information Commissioner's Office (ICO) routinely issues significant financial penalties and formal enforcement notices ordering the mandatory deletion of datasets found to be processed unlawfully. 

• Depending on one data source. Replacing third party data with a single first-party signal — email open rates, for example — creates fragility. Effective data strategies triangulate across multiple sources: behavioral, transactional, and declared.

• Ignoring employee training. Data collection practices change. The staff responsible for implementing those practices—marketers, analysts, CRM managers—often do not receive updated training when policies shift. Untrained staff create compliance gaps that legal teams discover after the damage is done.

• Poor data governance. Businesses collect first-party data without defining retention periods, access controls, or data quality standards. GDPR requires that personal data is kept no longer than necessary and protected against unauthorized access. Governance frameworks must be built before data volumes scale.

• Failing to monitor regulatory updates. GDPR enforcement guidance evolves. CCPA was amended by the California Privacy Rights Act (CPRA) in 2023, which introduced new obligations around sensitive personal information and automated decision-making. Businesses that treat compliance as a one-time project rather than an ongoing function will fall behind.

Is Third-Party Data Really Disappearing?

Third-party data is not disappearing entirely. Its role is narrowing, and the conditions under which it can be used legally and technically are becoming significantly more restrictive.

What the Future of Third-Party Data Looks Like

Several industries will continue to use third-party data in structured forms. Financial services firms use third-party credit and risk data under specific regulatory frameworks. Healthcare organizations access third-party demographic data for population health research under data use agreements governed by HIPAA. B2B organizations use third-party firmographic data—company size, industry classification, and technology stack—from providers such as Dun & Bradstreet or ZoomInfo, which operate under different consent dynamics than consumer data brokers.

Privacy-enhancing technologies (PETs) are creating new possibilities. Techniques such as differential privacy, federated learning, and data clean rooms allow organizations to derive insights from shared data without exposing individual-level records. Google's partnership with Ads Data Hub and Meta's Advanced Analytics use clean room environments to enable measurement without raw data transfer.

The future of data-driven marketing is not data-free. It is consent-first, governed, and increasingly reliant on direct relationships between brands and consumers. Organizations that invest in those relationships now—through loyalty programs, community platforms, and value exchanges—will be positioned to compete effectively in a market where third party data access continues to contract.

Understanding what is changing is the first step. Knowing how to implement compliant, effective data practices under GDPR, CCPA, and emerging privacy frameworks is where the real work begins. Our Data Privacy And Governance: GDPR, CCPA And Data Ethics course gives marketing professionals, data analysts, and compliance officers the practical framework to build data strategies that are both effective and legally sound—in the situations they actually face, not just the ones described in a policy document. 

What Should Businesses Remember About Third-Party Data?

Third party data is not disappearing overnight. Its usefulness is shrinking, and the legal conditions for using it are tightening in every major market.

The core shift is structural. Businesses that built their marketing and analytics capabilities on third party data need to rebuild those capabilities on data they own—collected directly, with documented consent, from people who have chosen to share it.

GDPR and CCPA are not the final word. The UK Data Protection and Digital Information Bill, India's Digital Personal Data Protection Act (2023), and expanding state-level privacy laws in the United States signal that the regulatory direction is settled. More rules are coming. Businesses that treat each new regulation as an isolated compliance task will continue to fall behind.

The organizations best positioned for the next decade of data-driven marketing are those that treated the cookie deprecation signal not as a technical inconvenience but as a strategic prompt to build better data infrastructure, train their teams properly, and develop direct relationships with their audiences that no platform or regulation can take away.