SoftBank Group International Chief Financial Officer (CFO) Alok Sama will step down from his post.

He will remain a senior adviser at the company, according to a memo, which did not provide a reason for his departure. Sama led the execution teams for the $59 billion merger of Sprint and T-Mobile and the $34 billion acquisition of ARM Holdings Plc, among other deals, according to the memo.

Samas departure comes against the backdrop of management upheaval at the firm. SoftBank Groups board has investigated who was behind a shareholder campaign seeking the ouster of two executives and whether the effort had any connections to company insiders, the media reported last year.

Sama will remain as a Softbank representative on boards including SB Energy and SoFi.

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