Warren Buffett may have dumped his entire Wells Fargo stake last quarter, finance professor David Kass says

· *Warren Buffett's Berkshire Hathaway may have sold its whole stake in Wells Fargo, David Kass, a finance professor at the University of Maryland, told Business Insider.*
· *The billionaire investor's company held a $9.3 billion position in the banking titan at the last count, making it the fifth-biggest holding in its stock...