Very very bullish, it means someone is betting the stock will go up and the puts will be worthless.
No other similar volume of puts or calls sold, so no straddle...just a naked put position.
Feb 14 PGNX140222P00005000 0.85 0.00 0.80 1.00 4,369 5,423
Actually that doesn't necessarily mean he is bullish on the stock. IV is very high for PGNX, he knows that IV will drop the second we listen to the conference this evening and we can cover those contracts tomorrow for a quick profit. IV will crash, then slowly rise into ADCOM meeting for there other drug in march.