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A record number of investors became 401(k) millionaires this spring.
At the end of the second quarter, 168,000 people with 401(k)s managed by Fidelity Investments had at least $1 million in their accounts, a rise of 50,000 people from a year earlier when there were 118,000, according to a new study by Fidelity, one of the nation's largest administrators of workplace retirement accounts. While gaining, that exclusive group of savers is still just a fraction of the 16.1 million people who have a 401(k) account managed by the fund company.