Recent insider buying of stock in City National Corp. has prompted questions about whether the Beverly Hills bank could be headed toward a takeover.

During July, three officers and directors snapped up 36,000 shares in the open market at around $10 a share, according to CDA/Investnet, Ft. Lauderdale, Fla., which tricks such actions. Significantly, the insiders were buying at prices much higher than they paid a few months ago. City National's stock closed Wednesday at $10.50, up 40% from its yearend price.

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