NEW YORK, Dec. 23 /PRNewswire/ -- Standard & Poor's will make the following changes to the S&P 100, S&P 500, S&P MidCap 400 and S&P SmallCap 600 indices:

• S&P 500 constituent Amazon.com Inc. (Nasdaq: AMZN) will replace Merrill Lynch & Co. Inc. (NYSE: MER) in the S&P 100, S&P MidCap 400 constituent SCANA Corp. (NYSE: SCG) will replace Merrill Lynch in the S&P 500, and Omega Healthcare Investors Inc. (NYSE: OHI) will replace SCANA in the S&P MidCap 400, all after the close of trading on Wednesday, December 31. Merrill Lynch is being acquired by S&P 100 and 500 constituent Bank of America Corp. (NYSE: BAC) in a transaction expected to be completed on or about that date, pending final approvals.

• S&P 500 constituent Costco Wholesale Corp. (Nasdaq: COST) will replace Wachovia Corp. (NYSE: WB) in the S&P 100, and Owens-Illinois Inc. (NYSE: OI) will replace Wachovia in the S&P 500, after the close of trading on Wednesday, December 31. Wachovia is being acquired by S&P 100 and 500 constituent Wells Fargo & Co. (NYSE: WFC) in a transaction expected to be completed on or about that date, pending final approvals.

• S&P MidCap 400 constituent FLIR Systems Inc. (Nasdaq: FLIR) will replace National City Corp. (NYSE: NCC) in the S&P 500, and Valley National Bancorp (NYSE: VLY) will replace FLIR Systems in the S&P MidCap 400 after the close of trading on Wednesday, December 31. National City is being acquired by S&P 500 constituent PNC Financial Services Group Inc. (NYSE: PNC) in a transaction expected to be completed on or about that date, pending final approvals.

• AMERISAFE Inc. (Nasdaq: AMSF) will replace FirstFed Financial Corp. (NYSE: FED), Actuant Corp. (NYSE: ATU) will replace BIOLASE Technology Inc. (Nasdaq: BLTI), American Physicians Capital Inc. (Nasdaq: ACAP) will replace Monaco Coach Corporation (NYSE: MNC), and Independent Bank Corp. (Nasdaq: INDB) will replace Libbey Inc. (NYSE: LBY) in the S&P SmallCap 600, after the close of trading on Wednesday, December 31. FirstFed Financial, BIOLASE Technology, Monaco Coach and Libbey all have market capitalizations below $25 million, whereas the minimum market cap needed to be admitted to the index is currently $200 million.

• Intermec, Inc. (NYSE: IN) will replace SI International Inc. (Nasdaq: SINT) in the S&P SmallCap 600 on a date to be announced. Serco Group plc is acquiring SI International in a cash deal that is still pending final approvals.

Standard & Poor's will monitor these transactions, and post any relevant updates on its website: www.standardandpoors.com.

Amazon.com operates retail websites. It is headquartered in Seattle, WA.

Costco Wholesale operates a chain of membership warehouses. It is headquartered in Issaquah, WA.

SCANA is primarily engaged in the generation, transmission and distribution of electricity. Headquartered in Columbia, SC, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Multi-Utilities Sub-Industry index.