Many Are Losing Thousands in Retirement If Their 401(k) Includes These Funds—Learn Why

Key Takeaways A 2025 study found that more than half of 401(k) plans from 2009 to 2013 offered consumers at least one investment fund option that shared revenue with the plan's administrator. Those plans had higher hidden costs, which can add up to thousands in lost value by the time you retire. Do you really know how your 401(k) plan is invested? If not, you might be putting your money in costlier mutual funds and not know it, new research suggests. Researchers analyzed the 1,000 largest 401(k) ...