A year after not-quite-closing the book on one retirement-related lawsuit, Fidelity Investments is once again fighting allegations that it improperly used customers’ money earned in overnight accounts to pay its own operating expenses, Reuters reports.

Three Massachusetts-based residents, Patricia Boudreau, Alex Gray and Bobby Negron, accused Fidelity of using income generated from retirement fund assets to offset its expenses. Their lawsuit, filed in U.S. District Court in Massachusetts, seeks class-action status for participants in 401(k) plans sponsored by EMC Corp., Bank of America Corp. and Safety Insurance Company.

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