As for individual stocks, shares of Vertex Pharmaceuticals (NASDAQ: VRTX) soared after releasing results from clinical studies, and CSX Corporation (NASDAQ: CSX) fell despite delivering a solid quarter. CSX stays on track Railroad company CSX reported a strong quarter last night that beat expectations, but the stock fell 5% on concerns about the rest of the year. CSX's efficiency improvements are paying off as well, with $90 million in efficiency gains during the quarter, exceeding inflation in costs.