DMandPenfold writes with a quote from an article in Computer World: NASDAQ and BATS saw their sites disrupted during the day on Monday and Tuesday respectively. The sites host company news and share price data, as well as vital information on live service status on the exchanges. It is understood, however, that while the websites were affected, the stock exchanges continued to trade as normal with no change to trading. A spokesperson at BATS said the exchange's site had been hit with 'an external Distributed Denial Of Service incident.' Our trading systems were not affected and there were no exchange customer disruptions associated with the incident.' ... NASDAQ told the Wall Street Journal that on Tuesday it experienced 'intermittent service disruptions on our corporate websites.' It is not known who initiated the attacks. In 2010, NASDAQ's Directors Desk online scheduling application was compromised by hackers. An FBI investigation found that the stock exchange's aging software and out of date security patches played a key part in the problems."