With flash-crash investigations still fresh, another worrying software upgrade was behind a...

|By:, SA News Editor

With flash-crash investigations still fresh, another worrying software upgrade was behind a $7.9B mispricing of S&P 500 ETF SPY on NYSE's Arca market at 4:15 p.m. yesterday. The fund's price was briefly quoted at $106.46, compared with a $117.74 opening - but the closing price was updated to $118.54, and the exchange will "bust" the low trades.