There are roughly 595,000 Americans sitting on 401(k) balances of $1 million or more, according to Fidelity. And that number ...

Many employer-sponsored plans offer limited investment options, which can stunt growth. But participants considering alternatives might need some sound advice to get the most from their accounts.

Growing a retirement account to $1 million depends heavily on how early you start investing. At a conservative 6% annual rate of return, a 35-year-old needs to save about $863 per month to reach $1 ...