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The data indicated that during Oct. 27-31, program trading amounted to 17.7 percent of NYSE average daily volume of 5,212.1 million shares1 , or 924.7 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 3,290.6 million shares a day during Oct. 27-31. About 28.1 percent of program trading took place on the NYSE, 1.3 percent in non-U.S. markets and 70.6 percent in other domestic markets, including Nasdaq, the American Stock Exchange and regional markets. -- www.nyse.com