all of the major activity happened in the last hour or so and it appears that SIGA also began a downward move at about the same time. Either some event is forthcoming and someone knows. e.g., a settlement, or else the selling pressure on PIP has ended, someone began buying and the upward move frightened the last few hold-outs in SIGA.
Hopefully, stock price moves up to where it should have gone when Parsons made his decision a long time ago were it not for SIGA's BK ploy. Eventually the market does correct itself as it should.