8. Bad Brake for Toyota

In 2010, Toyota recalled more than 400,000 of its hybrid vehicles. It was not because of a mechanical issue but the cars had a software glitch, which would cause a lag in the anti-lock-brake system. Class-action lawsuits resulting from those recalls, including the software glitch, were estimated to cost Toyota as much as $3 billion, according to Associated Press.

9. Knight's $440 Million Malfunction

Knight Capital Group, one of the biggest American market makers for stocks, is struggling to stay afloat following a software bug that cost a $440 million loss, an amount that's almost four times what it earned last year. The firm's shares lost 75 percent in two days after the faulty software caused unintended trades, sending dozens of stocks into spasms.

Founded in 1995, Knight grew during the late 1990s into one of the biggest traders of technology stocks that led the market.