Weight Watchers International (WTW) will replace KLX Inc. (KLXI) in the S&P MidCap 400, and KLX Energy Services Holdings Inc. (KLXE) will replace FTD Companies Inc. (FTD) in the S&P SmallCap 600 effective prior to the open of trading on Tuesday, September 18, 2018.

S&P 500 constituent, The Boeing Co. (BA), is acquiring KLX in a transaction expected to be completed on Monday, September 17 pending final conditions. Immediately prior to its acquisition, KLX will spin-off KLX Energy Services Holdings to shareholders. FTD Companies is ranked near the bottom of the S&P SmallCap 600 and is no longer representative of the small-cap market space.