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The data indicated that during Aug. 4-8, program trading amounted to 21.5 percent of NYSE average daily volume of 4,226.2 million shares1, or 908.4 million program shares traded per day.
Program trading encompasses a wide range of portfolio-trading strategies involving the purchase or sale of a basket of at least 15 stocks.
In all markets, program trading by member firms averaged 2,916.4 million shares a day during Aug. 4-8. About 31.1 percent of program trading took place on the NYSE, 0.4 percent in non-U.S. markets and 68.5 percent in other domestic markets, including Nasdaq, the American Stock Exchange and regional markets. -- www.nyse.com