Here is sth I posted on CLDX board:
"something going on with oncology/ADC biotechs since Friday. CLDX, SGEN, INCY, IMGN etc...
you might argue that a big fund is dumping/profit taking in this sector.
but I don't think so, because the volume has been very very low.
to me it looks like a shortie operation:
the stocks involved are major targets for shorts.
they are using the current negative sentiment and low volume in the market to bring this bunch down and cover their positions as much as possible."