firm that is mostly owned by Comerica Inc. of Detroit on Thursday named Michael T. Monahan its acting chief executive officer.

Mr. Monahan, 60, who stepped down in June after six years as president of Comerica, succeeds Paul D. Tobias, 48, who left Munder on Wednesday, a spokesman for Munder said. It could not be learned why Mr. Tobias left, and he could not be reached for comment.

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