Paul L. Audet was named head of cash management at BlackRock, according to Brian Beades, company spokesman. He replaces Mark A. Marinella, managing director and head of cash management, who recently left the firm for "personal reasons," said Mr. Beades. Mr. Marinella joined BlackRock when the firm bought State Street Research & Management. Mr. Audet, managing director and CFO of BlackRock, will relinquish his duties as CFO on Oct. 1. Steven E. Buller, partner and co-director of global asset management services at Ernst & Young, has been hired as CFO.