FINRA Rule 3210 defines threshold securities as any equity security of an issuer that is not an SEC reporting security and, for five consecutive settlement days, has:
aggregate fails to deliver at a registered clearing agency of 10,000 shares or more; and a reported last sale during normal market hours (9:30 a.m. to 4 p.m., ET) for the security on that settlement day that would value the aggregate fail to deliver position at $50,000 or more.
A security ceases to be a threshold security if it does not exceed the specified level of fails for five consecutive settlement days.
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