MFS Investment Management has rolled out Class R5 shares for 40 of its US mutual funds. Class R5 shares allow MFS to offer a lower-cost share class option to plan sponsors of—and advisors working with—qualified retirement plans, including 401(k) plans. Class R5 shares, unlike many other share classes, do not pay sub-accounting fees.

MFS began adding Class R5 shares to its US mutual fund line in March 2012 and over the course of the last year has added Class R5 shares to 40 of its funds, according to the firm.

"Retirement savers and plan sponsors are driving demand for lower-cost investment options in 401(k) and other qualified retirement plans," said Ryan Mullen, head of MFS' Defined Contribution Investments (DCI) group.

MFS currently manages more than $43 billion globally in defined contribution assets.

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