Tavy-probably more like ten or twelve days leading up to revocation. CMKX always had an unusually high number of shares held in certificate form, and a certificate sale is almost guaranteed to miss the T+3 date.
It's also possible that some of the fairly sleazy penny stock brokers did indeed naked short as much as the market would absorb in the days leading up to revocation, since they knew they would not have to make good on the delivery.
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