I agree... I was not talking about profit taking here. Solar and 3d have had a great year, and the whole market is overextended. It only makes sense that once the market begins correcting a little bit that solar and 3d suffer more so than other sectors.
When a stock like ONVO is tracking the SPX as accurately as is, but the moves being greater in magnitude, I interpret that as funds classifying ONVO as risky [and rightly so], so their trading machines will be trading aggressively to minimize risk, especially as support levels are broken.
I do not believe we are seeing profit taking at all here. This is simply risk management. The entire market is hugely over extended, so one can expect big money to be allocating their investments accordingly.