MKS Instruments Set to Join S&P MidCap 400; Invesco Mortgage Capital and Tactile Systems Technology to Join S&P SmallCap 600

NEW YORK, Nov. 17, 2017 /PRNewswire/ -- S&P Dow Jones Indices will make the following changes to the S&P MidCap 400 and S&P SmallCap 600 effective prior to the open of trading on Wednesday, November 22: S&P SmallCap 600 constituent MKS Instruments Inc. (NASD:...