In yet another senior management change, Charles Schwab & Co. executive Tom Decker Seip, architect of the wildy popular OneSource mutual fund market, is retiring, the company said Thursday.

Mr. Seip, who also oversaw Schwab's international business, is the third high-level executive to step down at the San Francisco brokerage firm since December, when David S. Pottruck was named co-chief executive, with Charles Schwab.

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