Data aggregators are companies that collect information from multiple sources, combine it into a single dataset, and make it available to other businesses or consumers. In personal finance, a data aggregator is the invisible layer that lets a budgeting app show your checking, savings, and credit card balances all in one place, even though those accounts are at different banks. But data aggregation extends well beyond finance into marketing, insurance, healthcare, and nearly every industry that runs on large volumes of consumer or business information.
How Data Aggregators Work
At the most basic level, a data aggregator pulls information from source systems, standardizes it into a consistent format, and delivers it to whoever needs it. The “sources” depend on the industry. A financial data aggregator connects to banks and credit card companies. A marketing data aggregator collects purchase histories, demographics, and online behavior from retailers, public records, and tracking networks. An insurance aggregator pulls quotes from multiple carriers so a consumer can compare rates side by side.
The value proposition is the same in every case: no single source has the full picture, and manually gathering information from dozens of providers is impractical. The aggregator does that collection automatically and continuously, then presents a unified view.
Financial Data Aggregators
The most common place you’ll encounter a data aggregator is in fintech. Companies like Plaid, Yodlee, MX Technologies, Finicity (owned by Mastercard), Akoya, Intuit, Stripe, and Visa’s Open Banking Solutions sit between your bank and the apps you use. When you connect your bank account to Venmo, a tax prep tool, or a loan application, one of these aggregators is typically handling the data transfer behind the scenes.
These companies retrieve account balances, transaction histories, and account details from your financial institutions. The app you’re using then displays or analyzes that information. Mortgage lenders use aggregators to verify income and assets during underwriting. Investment platforms use them to show your full portfolio across brokerages. Small business accounting tools use them to pull in bank transactions automatically.
Screen Scraping vs. API Access
Financial data aggregators historically relied on a technique called screen scraping. In this method, you hand over your bank login credentials to a third-party app. The aggregator then uses automated bots to log into your bank’s website on your behalf, read the information displayed on the screen, and copy it back to the app.
Screen scraping has significant drawbacks. It requires you to share your actual username and password with a third party, which extends the security perimeter far beyond what banks can control. Banks have no visibility into how scraping apps store or handle those credentials. The method is also unreliable: whenever a bank redesigns its login page or interface, the scraper breaks, causing failed connections. And because bots are loading full web pages repeatedly, banks found that screen scraping was consuming substantial server resources, slowing down service for all customers.
The industry has been shifting toward direct API connections. An API (application programming interface) is a structured channel that lets two software systems exchange specific pieces of data directly. Instead of loading an entire web page and copying what’s visible, an API retrieves only the data elements the app actually needs, such as your account balance or recent transactions. This is faster, more accurate, and far more secure. Users don’t share their login credentials. Banks can define exactly what data a third party can access, monitor usage, and let customers revoke access at any time. Encryption and standardized security protocols like Financial-grade API (FAPI) protect data in transit.
Marketing and Consumer Data Aggregators
Outside of finance, data aggregators operate in the consumer data and advertising space. These companies, sometimes called data brokers, collect personal information from public records, purchase histories, website cookies, loyalty programs, social media activity, and other sources. They build detailed consumer profiles and sell access to advertisers, insurers, employers, and other businesses.
This type of aggregation is less visible to consumers. You may never interact directly with these companies, yet they may hold your name, address, phone number, estimated income, purchasing habits, and browsing history. The profiles they assemble help businesses target ads, assess risk, or make decisions about you.
Your Privacy Rights
Regulatory pressure on data aggregators is increasing on two fronts: financial data sharing and consumer data brokering.
On the financial side, the Consumer Financial Protection Bureau finalized a rule under Section 1033 of the Dodd-Frank Act, effective January 17, 2025. This rule requires banks, credit unions, and other financial service providers to make consumers’ data available upon request to consumers and authorized third parties in a secure and reliable manner. It also defines obligations for third parties accessing that data, including privacy protections and requirements around consent. The rule is designed to push the industry away from screen scraping and toward standardized, secure API-based data sharing.
On the consumer data side, states have been passing laws that give you more control over your personal information. Starting in January 2026, a state-hosted platform will allow residents to submit a single deletion request that applies across multiple data brokers at once. Under those regulations, data brokers must check for and process deletion requests at least every 45 days. If your information matches their records, they must delete all associated personal data, including inferences they’ve drawn from it, and maintain a list of deletion requests to ensure the data stays deleted going forward.
Several other states have enacted or are developing their own privacy laws with opt-out and deletion rights. Even without a state-specific law, many data brokers offer opt-out processes on their websites, though tracking down each one individually can be time-consuming.
How Data Aggregators Affect You
If you use any app that connects to your bank, you’re already relying on a data aggregator. The same is true if you’ve ever compared insurance quotes online, used a mortgage preapproval tool, or let a budgeting app categorize your spending. These services are possible because an aggregator is pulling your data from one place and delivering it to another.
The practical questions worth considering are about control and security. When you connect a financial account through an aggregator, check whether the connection uses token-based API access (where you authenticate directly with your bank and never share your password with the app) or screen scraping (where you type your bank credentials into the third-party app). Most major aggregators have been migrating to API connections, but older integrations at smaller banks may still rely on scraping.
You can typically see which third-party apps have access to your bank data by checking your bank’s security or connected-apps settings. If you no longer use an app, revoke its access. For non-financial data aggregators and data brokers, search for your name on the major broker sites and submit opt-out requests where available. The process varies by company but usually involves verifying your identity and requesting removal.