NASD,Total,100.00%,73.58%,17.26%,9.16%
NASD,Citadel Securities,59.18%,61.97%,45.48%,62.64%
NASD,NITE,22.85%,24.69%,20.41%,12.64%
NASD,UBS Securities,17.11%,12.86%,32.94%,21.43%
NYSE,Total,100.00%,81.14%,12.51%,6.35%
NYSE,Citadel Securities,72.76%,73.97%,66.11%,70.41%
NYSE,UBS Securities,19.25%,18.01%,26.65%,20.41%
NYSE,NITE,5.00%,5.11%,4.92%,3.83%
AMEX,Total,100.00%,80.94%,12.77%,6.30%
AMEX,Citadel Securities,34.47%,35.02%,30.00%,36.49%
AMEX,UBS Securities,33.53%,29.34%,54.00%,45.95%
AMEX,NITE,23.91%,27.44%,11.33%,4.05%
AMEX,TRIM,7.49%,8.20%,4.67%,4.05%