Since the market was slammed by the financial crisis six years ago, retirement investors are putting more money into stocks. In March, stocks made up 66% of the assets in the 401 (K)s surveyed by Aon Hewitt, up from 48% in February 2008. Large investors such as pension funds, banks and insurance companies are showing less appetite for risk. New rules have allowed employers and the companies that oversee their retirement plans to steer employees into investments know as target-date retirement funds, which tend to be heavy in stocks, when the employees don’t make their own choices. IRA’s also have seen increased signs of risk taking this year.