So, your broker loans out shares on your open short position, and now is holding cash as collateral until those shares are "returned". Now, when you say "returned", you're saying the broker requires actual shares in order to close out your open short position. If all that was required was simply telling your broker that the stock is worthless, surely that is what you would do.
Apparently, whatever material scenario is required for brokers to close out open short positions has not, in fact, occurred. For example, a corporate action, an amendment to articles cancelling shares would likely do it. Of course, BioAmber shares were not cancelled.
It is blatantly obvious the story continues and there is interest in BioAmber shares. And wouldn't you know it, who are the only people who have actual shares?
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