Lesson Learned: Sizing into a Falling Knife

Thought I'd drop in and share a hard lesson from my early days. It wasn't about missing a move or getting stopped out, but a classic case of sizing error, trying to catch a falling knife. I was trading a biotech stock, $BIOC, after a negative trial result. It was down 30% pre-market, and I convinced myself it was 'oversold.' Instead of scaling in with small probes, I went in with a full position, trying to pick the absolute bottom.

Of course, it dropped another 20% in the first hour of trading, and my conviction turned to panic. I ended up cutting the entire position for a significant loss, far more than I would have if I'd respected the trend and the inherent risk of a binary event going wrong. The mistake wasn't necessarily being wrong about the eventual bounce, but being wrong about how to approach such a high-risk situation with proper sizing. It hammered home the importance of position sizing as a primary risk management tool, not just an afterthought.