A study released today by two investment industry groups said that 401(k) participants did not significantly alter their 401(k) accounts as equity markets plummeted last year.

The study, conducted by the Investment Company Institute and the Employee Benefit Research Institute, pulled data from the Participant-Directed Retirement Plan Data Collection Project, a database that contains information about 11.8 million active 401(k) plan participants in 35,367 plans, constituting some $579.8 billion in assets.

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