I was just about to post the same thing. At some point the sharks (read other hedge funds) will see this and begin to really push this up. He really is not playing this smartly. He had a bundle in the bank last January and now he is paying margin calls (they are relatively small for him, but not fun never the less).
Thats not working anymore. People are starting to look at Ackmans record which isn't even that good. He doesn't beat the S&P 500. He's a poster boy for dumb money overhyped hedge funds. He might of gotten away with this if it weren't for Icahn. Too bad for him.