 Shares of ManpowerGroup Inc. MAN, -2.73 jumped 3.8 in premarket trading Thursday, after the staffing services company reported third-quarter profit that beat expectations even as revenue fell a bit short, as demand for labor remained solid. Net income rose to 111.3 million, or 2.13 a share, from 97.7 million, or 1.77 a share, in the year-ago period. 