NEW YORK — JPMorgan Chase & Co. Monday appointed Sandie O'Connor, head of prime services at the investment bank, as the company's new treasurer.

The appointment is immediate, Douglas Braunstein, chief financial officer, and Carlos Hernandez, JPMorgan's head of global equities, said in a memorandum.

She succeeds Joseph Bonocore, who was appointed in late 2010 and left a year later for personal reasons.

The prime-services businesses includes prime brokerage, futures, options and derivatives clearing, and broker-dealer services. Under O'Connor's leadership, the business expanded its product platform in Europe in June 2011, and this year started the process of expanding in Asia. "We are fortunate to have someone with Sandie's breadth of experience assume the role of Treasurer," Braunstein and Hernandez said in the memo.

A new head of the prime-services unit will be appointed "in the near future," Braunstein and Hernandez said.

O'Connor joined JPMorgan in 1988 and was treasurer of Morgan Guaranty Trust Co., a predecessor of the current JPMorgan Chase, and held positions within the company's treasury and securities-services division.

The appointment came after several recent management changes, including the departure of Jay Mandelbaum as head of strategy and business development and the promotion of Doug Petno to head of commercial banking from chief operating officer of that division, all disclosed in January.

Last year, international banking chief Heidi Miller and retail banking Charlie Scharf left their positions in June; Todd Maclin was appointed head of retail banking.

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