U.S. stocks closed nearly unchanged on Monday. The Dow Jones industrial average rose 15,69 points, or 0.9 percent, to close at 17,229. The Standard & Poor's 500 index fell 2,61 points, or 0.13 percent, to close at 2,019.58. The Nasdaq composite index rose 1,81 points, or ,04 percent, to close at 4,750.28.