Strasmore Research

Short selling

Short interest and short volume, what FINRA and exchange data actually measure, how stale each number is, and how to read them together.

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When Is Short Interest Released?

FINRA publishes short interest twice a month, mid-month and month-end, about two weeks after each settlement date. See the live release cadence and lag.

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FINRA Short Interest Data, Explained

Where short interest data actually comes from: FINRA's twice-monthly settlement file and its daily short volume file. Schedules, contents, and failure modes.