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CRSP Research Data Products PERMNO & PERMCO

PERMNO® & PERMCO®

Permanent Identifiers. Proven Precision.

PERMNO® & PERMCO® are the foundation of CRSP Data’s infrastructure, providing permanent, unchanging identifiers that track securities across their full lifecycle. Unlike tickers or CUSIPs, these identifiers remain consistent through mergers, name changes, and restructurings. The result is seamless historical alignment, reliable back-testing, and lasting data integrity trusted by institutions and researchers for decades.

Used in over 

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published studies

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Tickers change. PERMNO doesn’t.

Our identifiers persist across a security’s entire lifecycle – from IPO through restructuring – providing the stable foundation that financial data demands.

Mergers. Acquisitions.

PERMNO follows securities over the course of time and across corporate actions, ensuring seamless datasets that account for structural changes.

Historical analysis requires consistency.

PERMNO provides a unified reference key, allowing researchers to compare decades of market activity without gaps.

Back-tests are only as good as their data.

With stable identifiers and accurate linkages, PERMNO lets analysts run simulations with confidence.

CRSP Data runs on PERMNO.

As the foundation of CRSP’s securities database, PERMNO ensures that every dataset we provide is accurate, replicable, and aligned with academic and institutional standards.

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Get access to the data powering groundbreaking research and policy.

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Explore Studies Backed by CRSP Research Data

CRSP Data has powered thousands of peer-reviewed publications, financial models, and regulatory studies with nearly a century of data. Our identifiers ensure those insights rest on a stable, consistent foundation.

News & Updates

CRSP Market Indexes Notification – Index Name Change Notice

Morningstar Indexes is changing the names of the CRSP Market Indexes. These changes will align the individual index names with the standard Morningstar naming convention. Morningstar will implement the name [...]

April 2026 CRSP Market Indexes Methodology Guide Updates

The April 2026 CRSP Market Indexes Methodology Guide is now available at crsp.org/indexes/crsp-market-indexes-methodology. [...]

CRSP Market Indexes Notification – Changes to Index Governance

Beginning July 1, 2026, governance of the CRSP Market Indexes will transition to the standard Morningstar Indexes Governance framework, replacing the governance authorities and procedures currently outlined in the CRSP [...]
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