CBOE Holdings, Inc (NASDAQ:CBOE) shares dropped 4.13% and closed at $48.74. The company on August 2 reported second quarter 2013 net income allocated to common stockholders of $45.5 million, or $0.52 per diluted share, compared with $37.9 million, or $0.44 per diluted share in the second quarter of 2012. Adjusted net income allocated to common stockholders […]