What Is Chubb? 7 Things to Know About the Warren Buffett Mystery Stock.

Warren Buffett and Berkshire Hathaway (NYSE:BRK-A, NYSE:BRK-B) were under great scrutiny going into the closing bell yesterday. That's because yesterday was also the deadline for the company to file its firstquarter 13F form. After Berkshire was able to file its 13Fs confidentially for the past six months, investors speculated that Berkshire was holding a "mystery stock" within the financial services sector. What did the Warren Buffett mystery stock turn out to be? Property and casualty insurer Chubb (NYSE: ...