Carl Icahn just doubled down on Hertz (HTZ)

Hedge fund manager Carl Icahn has more than doubled his stake in Hertz Global Holdings, the parent company of Hertz car rental franchises.
That's according to a new filing with the Securities and Exchange Commission.
Icahn doubled his holding from about 15.6% to about 33.7%, according to Bloomberg.
Hertz shares collapsed nearly 50% on Tuesday following the release of third-quarter earnings. 
As Business Insider's Bob Bryan reported, the company missed earnings per share significantly,