NEW YORK, Oct. 27, 2015 /PRNewswire/ -- S&P Dow Jones Indices 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 BlackRock Inc. (NYSE:BLK) will replace Hewlett-Packard Co. (NYSE:HPQ) in the S&P 100 after the close of trading on Friday, October 30. Hewlett Packard Enterprise Co. (NYSE:HPE) will be added to the S&P 500 after the close of trading on Friday, October 30, replacing Hudson City Bancorp Inc. (NASD:HCBK), which will be removed from the S&P 500 after the close of trading on Monday, November 2. Hewlett Packard Enterprise will be added to the S&P 500 on a zero price basis reflecting its spin-off from S&P 500 constituent Hewlett-Packard Co. Following the spin-off, the Hewlett-Packard stub, which will change its name to HP Inc., will remain in the S&P 500, but its post spin market capitalization will no longer make it appropriate for the S&P 100. Hudson City Bancorp is being acquired by S&P 500 constituent M&T Bank Corp. (NYSE:MTB) in a deal expected to be completed on or about November 1, pending final approvals.
• S&P SmallCap 600 constituent MarketAxess Holdings Inc. (NASD:MKTX) will replace City National Corp. (NYSE:CYN) in the S&P MidCap 400, and Ameris Bancorp (NASD:ABCB) will replace MarketAxess Holdings in the S&P SmallCap 600 after the close of trading on Friday, October 30. Royal Bank of Canada (NYSE:RY) is acquiring City National in a deal expected to be completed on or about that date pending final conditions.
• Exterran Corp. (NYSE:EXTN) will be added to the S&P SmallCap 600 after the close of trading on Tuesday, November 3, replacing ION Geophysical (NYSE:IO), which will be removed from the S&P SmallCap 600 after the close of trading on Wednesday, November 4. Exterran will be added to the S&P SmallCap 600 on a zero price basis reflecting its spin-off from S&P SmallCap 600 constituent Exterran Holdings Inc. (NYSE:EXH). Following the spin-off, the Exterran Holdings stub, which will change its name to Archrock Inc. (NYSE:AROC), will remain in the S&P SmallCap 600. ION Geophysical is ranked near the bottom of the S&P SmallCap 600 and is no longer appropriate for that index.

BlackRock, headquartered in New York, NY, is a publicly owned investment manager.

Hewlett Packard Enterprise provides technology solutions. Headquartered in Palo Alto, California, the company will be added to the S&P 500 GICS (Global Industry Classification Standard) Technology Hardware, Storage & Peripherals Sub-Industry index.

MarketAxess Holdings operates an electronic trading platform. Headquartered in New York, NY, the company will be added to the S&P MidCap 400 Specialized Finance Sub-Industry index.

Ameris Bancorp provides banking services to retail and commercial customers. Headquartered in Moultrie, GA, the company will be added to the S&P SmallCap 600 GICS Regional Banks Sub-Industry index.

Exterran provides compression, production and processing products and services. Headquartered in Houston, TX, the company will be added to the S&P SmallCap 600 GICS Oil & Gas Equipment & Services Sub-Industry index.

Following is a summary of the changes:

Additions to and deletions from S&P  Dow Jones Indices do not in any way reflect an opinion on the investment merits of the companies involved.

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SOURCE S&P Dow Jones Indices