XOMA, a biotech, has been around a long time, and has seen dizzy heights and very low lows. In the last few weeks it received some positive news and jumped from a dollar or so to over $7, a true five bagger.
Today, it dropped to below 6. Biotechs are known for big moves, but this is ridiculous. Keep an eye on it. It's very likely to explode again after it settles.
Disclosure - no position, but looking at it.