October 2011 FIF Market Share And Market Dynamics Reports – Executive Summary

U.S. Equities Market Share

• Share volumes traded across Tape A, B, and Cincreased 2% monthly and 16% annually to182 billion shares (see chart).
• In October 2011, off-exchange trading accounted for 29% of the shares traded in NMS Equity Securities, an increase of 2%.
• Share volumes in NYSE-listed securitiesincreased 5% monthly and 11% annually to101 billion shares.
• NASDAQ-listed securities traded over exchange increased 1% monthly and 9% annually to 44 billion shares.

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