Polygon sources its U.S. stock market data from venues including the Securities Information Processors (SIPs), which consolidate quotes and trades from all exchanges, direct connections to major U.S. stock exchanges, FINRA Trading Facilities for off-exchange trades, the OTC Reporting Facility, Alternative Trading Systems (ATSs), and other data sources.

Polygon provides stock data from the consolidated SIP feeds for users on Individual plans, offering a comprehensive view of the market. For customers utilizing Polygon's Business offerings, there is the ability to choose between data from the SIP feeds or proprietary exchange feeds (prop feeds), which can offer even more granular detail directly from the individual exchanges before SIP consolidation, catering to professional and institutional needs.