I don't really pay much attention to specifics, just general market trends. I only saw this story because I was reading the news linked from the Berkshire page on Robinhood and this was a top story they had. Ackman is interesting. He recently made a gamble on Nike too, putting a ton of money in even though other investors are saying the company is too risky right now.
If you don't do stupid things you don't get stupid returns... :)