Index Shuffling: ComScore Added To S&P MidCap 400, Chemours Added To S&P SmallCap 600

Shares of COMSCORE, Inc. (NASDAQ: SCOR) were trading higher by nearly 4 percent late Tuesday morning after S&P Dow Jones Indices announced the company's stock will be added to the S&P MidCap 400 index.

ComScore's pending acquisition of Rentrak Corporation (NASDAQ: RENT) will result in a new entity with a sufficient market capitalization that is "more representative" of the mid-cap market space.

Chemours Co (NYSE: CC)' stock will replace ComScore's in the S&P SmallCap 600 as its current market capitalization is "more representative of the small-cap market space."

Shares of Chemours were trading lower by nearly 3 percent at $3.39.