Hewlett-Packard (NYSE: HPQ) shares are trading up 0.4% to $20.11, following news that its acquisition of Autonomy is being investigated even further. With its 10-Q filed with the U.S., Hewlett-Packard disclosed that the U.K. Serious Fraud Office is looking into the 2011 investigation. Share volume was 506,000, compared to an all-day average of five million