Motley Fool | Why Jacobs Engineering Group's Shares Plunged 15% Today ... Motley Fool Shares of Jacobs Engineering Group Inc (NYSE:JEC) plunged as much as 15.2% in trading Tuesday after the company reported fiscal fourth-quarter results that ... More on Jacobs Engineering's FQ4 Jacobs Engineering tops estimates Jacobs Engineering (JEC) Beats Q4 Earnings Estimates |