Audit Analytics data has a Company Key that is equivalent to CIK in Compustat. Ticker symbols can also be used as a secondary linking key. You can link Audit Analytics and Compustat based on the CIK available in both sets. Then you can link Audit Analytics to CRSP using the CCM linking tables (linking GVKEY to PERMNO/PERMCO using CSTLINK2 file).
Merging Data: AuditAnalytics with CRSP and Compustat
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