Tuesday, October 9, 2012

Mysterious Algorithm Was 4% of Trading Activity Last Week

Melloy, John. "Mysterious Algorithm Was 4% of Trading Activity Last Week." CNBC, October 8, 2012.

From the article: "A single mysterious computer program that placed orders — and then subsequently canceled them — made up 4 percent of all quote traffic in the U.S. stock market last week, according to the top tracker of high-frequency trading activity. The motive of the algorithm is still unclear.

The program placed orders in 25-millisecond bursts involving about 500 stocks, according to Nanex, a market data firm. The algorithm never executed a single trade, and it abruptly ended at about 10:30 a.m. ET Friday." Read more