If that is the case then it could be a misstatement on the part of the FDIC considering how fast they sold the Bank to JPM without any evaluation of the worth of the bank and its assets and liabilities.
The FDIC may have just presumed there were equity holders.
When holding companies buy other companies the assets of the sub become the astes of the holding co and the existing shares of the sub if it was publically traded are exchanged for the shares of the holding co. That is the way it works. The only common shares available are from WMI.IMHO