AMEX,Total,100.00%,88.64%,7.02%,4.34%
AMEX,Automated Trading,28.31%,30.69%,2.63%,21.22%
AMEX,Citadel Derivatives Group,19.17%,20.93%,0.66%,13.00%
AMEX,Knight Capital Markets,16.07%,17.13%,2.14%,16.98%
AMEX,UBS Securities,10.48%,9.95%,1.15%,36.34%
AMEX,Maxim Group,7.03%,7.56%,0.33%,7.16%
AMEX,Credit Suisse Securities ,5.78%,6.27%,0.49%,4.51%
AMEX,Assent ATS,3.86%,4.35%,0.00%,0.00%
AMEX,E*Trade Capital Markets,2.64%,2.88%,0.82%,0.80%
AMEX,NASDAQ Execution Services LLC,2.55%,0.00%,36.35%,0.00%
AMEX,Direct Edge ECN LLC (X),1.66%,0.00%,23.68%,0.00%
NASD,Total,100.00%,82.65%,12.87%,4.48%
NASD,Knight Equity Markets,32.45%,35.79%,10.25%,34.55%
NASD,E*Trade Capital Markets,15.28%,17.34%,1.10%,18.00%
NASD,Automated Trading,12.66%,14.32%,3.30%,9.00%
NASD,Maxim Group,11.26%,12.86%,0.42%,12.90%
NASD,Citadel Derivatives Group,7.79%,9.01%,0.76%,5.60%
NASD,UBS Securities,5.13%,5.05%,1.35%,17.52%
NASD,NASDAQ Execution Services LLC,5.50%,0.00%,42.76%,0.00%
NASD,Credit Suisse Securities ,2.31%,2.70%,0.08%,1.46%
NASD,Direct Edge ECN LLC (EDGX),2.07%,0.00%,16.09%,0.00%
NASD,Assent ATS,2.06%,2.35%,0.59%,0.97%
NYSE,Total,100.00%,81.35%,14.16%,4.49%
NYSE,Knight Capital Markets,29.33%,33.70%,2.39%,35.19%
NYSE,Automated Trading,17.41%,20.15%,1.75%,17.13%
NYSE,Citadel Derivatives Group,13.91%,16.26%,0.87%,12.56%
NYSE,Maxim Group,10.35%,12.02%,0.62%,10.88%
NYSE,Credit Suisse Securities ,8.35%,9.72%,0.19%,9.20%
NYSE,NASDAQ Execution Services LLC,6.92%,0.01%,48.85%,0.00%
NYSE,UBS Securities,3.96%,4.11%,0.38%,12.56%
NYSE,E*Trade Capital Markets,1.88%,2.17%,0.09%,2.42%
NYSE,Archipelago Trading Services Inc,1.82%,0.03%,12.66%,0.00%
NYSE,Direct Edge ECN LLC (EDGA),1.74%,0.00%,12.28%,0.00%
OPTN,Total,100.00%,0.00%,100.00%,0.00%
OPTN,CBOE,34.44%,0.00%,34.44%,0.00%
OPTN,ISE,24.21%,0.00%,24.21%,0.00%
OPTN,PSX,22.19%,0.00%,22.19%,0.00%
OPTN,ARCA,19.03%,0.00%,19.03%,0.00%