It pays to stick with your retirement plan.
A new analysis by Fidelity Investments found that investors who have been in their company's 401(k) plan for 15 years straight saw their average balance grow from $43,900 in 2001 to $331,200 as of the end of September. That works out to a 654 percent return over 15 years or an annualized 14 percent.
Fidelity's analysis is based on more than 22,000 corporate retirement plans with 14.5 million participants.
"It's the first time we have the data to study people who have been in their 401(k)s for 15 years," said Jeanne Thompson, Fidelity's senior vice president of workplace investing. "It shows the benefits of setting a plan and keeping with it."