David Einhorn, Greenlight Capital His call: Short oilfield-service company Core Laboratories NV.
DXC rallied 33 percent, with dividends, to about $103.51.
Bill Ackman, Pershing Square Capital Management His call: The billionaire reiterated his bullish view on real estate group Howard Hughes Corp.
Stock of the company, of which Pershing Square is one of the largest shareholders, traded at a big discount to the underlying net asset value, he said.
“This is one of the most attractive times in the history of the company to invest.” What happened: The stock has risen about 8 percent.