It wasn't the kind of welcome Richard L. Huber had hoped for.

Less than two weeks after he was tapped to lead Aetna, the giant insurer's stock plunged 12% on fears that the Hartford, Conn.-based company's expenses were rising faster than its premium income. But Mr. Huber is up to the challenge of turning things around at Aetna, experts said. After all, he's a former banker.

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