According to Business Week:
“CBOE Stock Exchange canceled 18 trades of 100 shares that took place at 1 cent in Accenture over seven seconds starting at 2:47 p.m. The trades occurred against so-called stub quotes, according to David Harris, the exchange’s president, or orders placed by market makers for as little as a penny that they never expect to be used. Stub quotes would only be executed against trades sent by investors who want to sell at any price.“
Google Finance shows a high of $42.30 per share and a closing price of $41.09.