REUTERS/Brendan McDermid
In his latest letter, he pointed out that a bunch of "cool kid" stock reminded him of a bubble. He's short a number of these companies in what he's calling the "bubble basket."
He's going to illustrate his bubble basket by talking about one company and not disclosing the others.
His short is AthenaHealth.
He said it's an excellent company and has a great CEO.
He doesn't want it to fail. He just thinks it's over-priced. He thinks this stock can fall 80%.
He said it isn't positioned to succeed the way the bulls hope.