New Haven-based companies traded on stock exchanges include NewAlliance Bank, the second largest bank in Connecticut and fourth-largest in New England (NYSE: NAL), Higher One Holdings (NYSE: ONE), a financial services firm United Illuminating, the electricity distributor for southern Connecticut (NYSE: UIL), Achillion Pharmaceuticals (NASDAQ: ACHN), Alexion Pharmaceuticals (NasdaqGS: ALXN), and Transpro Inc.