Qualcomm Inc. handed the title of board chairman to an independent director, while its suitor Broadcom Ltd. pledged Friday not to sell strategic pieces of its target to foreign companies, the latest maneuverings as the U.S. reviews a proposed hostile takeover between the two.

Jeffrey Henderson, who has been on the Qualcomm board since 2016 and was previously finance chief of Cardinal Health Inc., will take over as nonexecutive chairman.

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