BATS Global Markets reported that the matched market share of its two national stock exchanges totaled 12.4 percent in September, the third month in a row topping the 12-percent mark.
But that is down from 12.8 percent in August. A year ago, its share was 12.0 percent.
Volume in September was up from August, but down from a year ago.
The exchange operator saw an average daily matched volume of 806.5 million shares during the month, topping the 693.0 million shares traded in August by 16.4 percent.
But that is still down 21.0 percent from a year ago. In September 2011, BATS saw an average daily matched volume of 1,021 million shares.
In September, BATS Options saw its matched market share fall to 3.5 percent, down from 3.7 percent in August and off from the 3.8 percent seen one year ago. Average daily matched volume climbed to 594,064 contracts traded from 485,935 shares in August. One year ago options volume was 697,714 contracts.
The BATS 1000 Index, a broad based U.S. equities market benchmark, ended the month up 345.73 points, or 2.2 percent higher, closing at 16,086.42.
BATS operates two stock exchanges in the U.S., the BATS BZX Exchange and BATS BYX Exchange; as well as BATS Options, a U.S. equity options market; and BATS Europe and Chi-X Europe, which operate FSA-authorized multilateral trading facilities.
