Nvidia is going to be the hardest hit stock after Japan's BOJ starts protecting their country's economy with monetary policy (a bad decision since Japan's problems are fiscal more than anything). However, I suspect more of a flash crash more than anything. Still, China is competing strong with Nvidia. I'd say Nvidia was a sell a week ago but now the market has mostly caught up. If you own it specifically as a stock, I'd still sell but I wouldn't short sell it or buy puts on it.