fees spelled out in mans hand Additionally a lawsuit against Fidelity was filed this week by an investor in T-Mobile USA Inc.'s 401(k) plan over so-called infrastructure fees. (Photo: Shutterstock)

(Bloomberg) — Fidelity Investments says it fully discloses fees that it charges some mutual funds for using the firm's platform to access retirement plan customers.

The fees and disclosure of them are being probed by the U.S. Labor Department, the Wall Street Journal said Wednesday. They're also the centerpiece of a Feb. 21 lawsuit against Fidelity by an investor in T-Mobile USA Inc.'s 401(k) plan. It claims the firm conceals so-called infrastructure fees.

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