NASD,Total,100.00%,38.06%,19.26%,42.69%
NASD,Automated Trading,50.86%,94.99%,62.26%,6.38%
NASD,Principal,33.15%,5.01%,37.74%,56.17%
NASD,Archipelago Trading Services,6.27%,0.00%,0.00%,14.68%
NYSE,Total,100.00%,4.94%,2.90%,92.16%
NYSE,Principal,62.69%,55.17%,47.06%,63.59%
NYSE,Archipelago Trading Services,14.99%,0.00%,0.00%,16.27%
NYSE,AGIS,12.61%,0.00%,0.00%,13.68%
NYSE,Automated Trading,5.28%,37.93%,52.94%,2.03%
AMEX,Total,100.00%,2.17%,1.45%,96.38%
AMEX,Principal,66.30%,16.67%,25.00%,68.05%
AMEX,AGIS,22.10%,33.33%,0.00%,22.18%
AMEX,Archipelago Trading Services,7.61%,0.00%,0.00%,7.89%