Short Sale Restriction (SSR) is SEC Rule 201 SHO. It was amended February of 2010
It serves as a sort of circuit breaker intended to dampen severe price declines.
It is automatically triggered when a security is down 10% or more from the prior day's close, and last the rest of that day and the next day.
So for HDY it was triggered on Thursday and Friday as both days saw a decline of 10%+
Essentially, HDY short sellers are restricted to offering above the bid while it is in effect.
Those long HDY can still sell of course, and it is possible to initiate a synthetic short sale by buying a put option.
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