(Bloomberg) -- Bill Gross will become the lead manager of Pimco Unconstrained Bond Fundafter its current manager Chris Dialynas leaves to take a sabbatical.

The transition from Dialynas, who has been at Pacific Investment Management Co. since 1980 and has run the $28 billion unconstrained mutual fund since 2008, to Gross is effective today, according to a regulatory filing by the Newport Beach, California-based firm.

Mark Porterfield, a spokesman for Pimco, declined to comment on the change.

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