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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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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

Lessons from the Markets

Mark Carhart, PhD ’95, reflects on his Booth experience, his research that led to the CRSP Mutual Fund Database, and why index investing remains the best long-term strategy. [...]

Seeing Through the Fog of Market History

“The farther backward you can look,” Winston Churchill once famously said, “the farther forward you can see.” It’s a sentiment that’s as true for investors and market researchers as it [...]

Morningstar Plans to Acquire CRSP

We are pleased to share some exciting news about the Center for Research in Security Prices (CRSP): The University of Chicago, home to CRSP, and Morningstar, Inc. today signed an [...]
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