Possibly because they expect the PPS to drop with the possible issuance of new shares
Let's see IF IF IFIN I am correct as I still contend that the ownership structure MUST BE CORRECTED placing COMMONS back to their position of holding 51%
Don't forget that there are index funds that short the Nasdaq as a whole. These funds will take the money invested in them and short the individual stocks on a pro rata basis. Because of this, there will always be shorts against all of the stocks.
These shorts generated by index funds will not be as likely to cover on a day like Friday because the index (as a whole) is diversified and the losses from the COOP stocks will not be as painful.
By the way, thanks for the information you provide!