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CRSP is recognized as the leading provider of research-quality historical market and returns data. CRSP Research Data Products is trusted by more than 600 institutions across 35 countries. Our subscribers include leading financial firms, government agencies, and respected research universities that rely on CRSP Research Data Products for serious analysis and strategic decision-making.

CRSP Data Supports:

  • Academic researchers who publish in peer-reviewed journals and require transparent, historically accurate data that meets the highest standards of scholarly scrutiny.
  • Financial analysts who depend on precise, structured data for back-testing, risk modeling, and market simulation.
  • Regulators and policymakers who use CRSP datasets as the foundation for financial and economic research that guides policy.
CRSP pioneered research-quality stock market data more than 65 years ago. Today, that legacy continues in support of serious institutions that rely on accuracy, transparency, and long-term insight.

PERMNO® is CRSP’s proprietary, permanent identifier used to track U.S.-listed equities over time and across corporate restructurings. Unlike ticker symbols, which can change, each PERMNO remains fixed for the life of a security. It accounts for name changes, mergers, acquisitions, spin-offs, and other business events and allows researchers and analysts to follow securities with historical continuity and accuracy. Learn more>>

Important Notice: CRSP US Stock & Indexes Databases Flat File Format 2.0 (CIZ)

As previously communicated, CRSP introduced the Stock & Indexes Flat File Format 2.0 (CIZ) in summer 2022. The December 2024 data which was released in January 2025 was the last release of datasets produced in the Legacy (FIZ) and Flat File Format 1.0 (SIZ) formats.

Additional reference materials and resources can be found in the Documents & Resources section of the CRSP US Stock Databases landing page.

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CRSP US Stock Databases

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CRSP Survivor-Bias-Free US Mutual Fund Database

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CRSPRDP News & Updates

What’s New in CRSP’s September Ranking?

We’ve updated our methodology to exclude Passive Foreign Investment Companies (PFICs) from our CRSP Market Indexes—helping mitigate tax implications and improve investor outcomes. [...]

CRSP Mentioned in 1929: Inside the Greatest Crash in Wall Street History – And How It Shattered a Nation

CRSP is pleased to be recognized in Andrew Ross Sorkin’s new book, 1929: Inside the Greatest Crash in Wall Street History – And How It Shattered a Nation. [...]

What does it really mean to be passive in today’s U.S. equity market?

As U.S. equity markets evolve, so should the way they’re measured. In an article published by ETF.com, CRSP explores why traditional, fixed-constituent benchmarks may no longer capture the full dynamics [...]
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