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The data indicated that during June 22-26, program trading amounted to 48.6 percent of NYSE average daily volume of 3,449.8 million shares1, or 1,675.7 million program shares traded per day (Revised from 1,678.3 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 4,896.3 million shares a day during June 22-26 (Revised from 4,898.9 million shares a day). About 34.2 percent of program trading took place on the NYSE (Revised from 34.3 percent of program trading), 0.3 percent in non-U.S. markets and 65.5 percent in other domestic markets, including Nasdaq, NYSE Amex and regional markets.
1 The NYSE calculates program trading as the sum of shares bought, sold and sold short in program trades. The total of these shares is divided by the sum of shares bought, sold and sold short on the NYSE including its crossing sessions.