Hancock Holding Co. and PacWest Bancorp are scheduled to exchange Standard & Poor's indexes.

S&P said late Thursday that Hancock will replace PacWest on the S&P MidCap 400 index on June 3. The Gulfport, Miss., company is expected to close its deal to acquire Whitney Holding Corp. in New Orleans a day later, creating an organization with assets of $20 billion.

PacWest will move over to the S&P SmallCap 600 index, where the $5.5 billion-asset company will replace Hancock. S&P said that the move is a result of the Los Angeles company's market capitalization falling below $775 million "making it more representative of the small cap market space."

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