Private sector pensions of the S&P's index of the 1,500 largest private companies are underfunded by over $400 billion. The deficits have resulted entirely during the financial crisis of 2008, according to an analysis in the Washington Post.
According to the Post
In a related item, the Wall Street Journal reports that 401(k)'s have taken a massive hit just as Baby Boomers are gearing up to retire: