NEW YORK, Jan. 25, 2016 /PRNewswire/ -- S&P SmallCap 600 constituent comScore Inc. (NASD: SCOR) will replace The Chemours Co. (NYSE: CC) in the S&P MidCap 400, and Chemours will replace comScore in the S&P SmallCap 600 after the close of trading on Friday, January 29. comScore is acquiring Rentrak Corp. (NASD: RENT) in a deal expected to be completed on or about that date pending final approvals, and the combined company's market capitalization will be more representative of the mid-cap market space. Chemours is ranked near the bottom of the S&P MidCap 400 and has a market capitalization more representative of the small-cap market space.

comScore provides digital media analytics products and services. Headquartered in Reston, VA, the company will be added to the S&P MidCap 400 GICS (Global Industry Classification Standard) Internet Software & Services Sub-Industry index.

Chemours is a chemical company that provides titanium technologies, fluoroproducts, and chemical solutions. Headquartered in Wilmington, DE, the company will be added to the S&P SmallCap 600 GICS Diversified Chemicals Sub-Industry index.

Following is a summary of the changes:

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