Charles R. Schwab, chairman and founder of Charles Schwab Corp., was reappointed CEO of the firm today. He replaces David S. Pottruck, who "stepped down, effective immediately," according to a company announcement that indicated Mr. Pottruck was ousted by the Schwab board of directors. Schwab spokesman Glen Mathison wouldn't elaborate. After serving as co-CEO with Mr. Pottruck for more than four years, Mr. Schwab had relinquished the title on May 9, 2003. Schwab today announced it had $113 million in net income for the second quarter, a 10% drop from the same period a year earlier, although revenues rose 9% in the quarter ended June 30.