Now this is interesting, from that post of rule 203b.....
B. Short Sales in Threshold Securities — Rule 203(b)(3) 1. Threshold Securities The Commission has decided to adopt, with certain modifications from what was proposed, additional requirements targeted at stocks that have a substantial amount of failures to deliver. As adopted, Rule 203(b)(3) requires any participant of a registered clearing agency ("participant")80 to take action on all failures to deliver that exist in such securities ten days after the normal settlement date, i.e., 13 consecutive settlement days.81 Specifically, the participant is required to close out the fail to deliver position by purchasing securities of like kind and quantity.
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