The New York Stock Exchange today released its weekly program-trading data submitted by its member firms. The report includes trading in all markets as reported to the NYSE for Sept. 18-22

The data indicated that during Sept. 18-22, program trading amounted to 28.3 percent of NYSE average daily volume of 3,176.0 million shares1, or 898.5 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 with a total value of $1 million or more.

For the third quarter of 2006, the NYSE’s program-trading report includes profiles of program trading whenever the New York Stock Exchange Composite Index (NYA) moves 150 points or more in a single direction during any one-hour period. During Sept. 18-22, there were no such periods.

In all markets, program trading by member firms averaged 1,897.8 million shares a day during Sept. 18-22. About 47.3 percent of program trading took place on the NYSE, 9.2 percent in non-U.S. markets and 43.4 percent in other domestic markets, including Nasdaq, the American Stock Exchange and regional markets.