I find it difficult to believe that "Big Money" would spend that much time (and money) on such a small trade when there is no "Negative" catalyst in the near term horizon.
I mean, look at the market cap & price of NWBO. Look at the # of Open Put Contracts across the option markets. There is just not that much volume.
For a smaller fund, lets say in the realm of $100s MM, I find it difficult to believe these funds would spend hours and days + thousands of precious dollars on such a short play.
Maybe I am wrong, but for me the cost of time + money and the huge upside risk from upcoming German Pricing Negotiation Finalization + DCVax-Direct results does not justify a short term bet to pocket a 30% gain.
There are FAR better shorts plays out there that have the potential for significantly larger price movements then NWBO.