Escrows are not shares, period. They are place holders. They were shares pre-conversion. This is escrow holder knowledge that is known to real escrow holders.
WAMUQ, WAMKQ, WAMPQ were converted into WMIH shares as per part of the bankruptcy plan - this is equivalent to a reverse split.
You cannot trade the pre-reverse split shares AND trade the post-reverse split shares along with it.
I recommend you brush up on US laws in regards to your endeavor. Good luck in Germany, you will need it.
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