NEW YORK, Oct. 13, 2022 /PRNewswire/ — Westlake Corp. (NYSE:WLK) will replace MillerKnoll Inc. (NASD:MLKN) in the S&P MidCap 400, and MillerKnoll will replace Covetrus Inc. (NASD:CVET) in the S&P SmallCap 600 effective prior to the opening of trading on Tuesday, October 18. Clayton, Dubilier & Rice and TPG Capital acquired Covetrus in a deal that closed today. MillerKnoll is more representative of the small-cap market space.
Following is a summary of the changes that will take place prior to the open of trading on the effective date:
| Effective Date | Index Name | Action | Company Name | Ticker | GICS Sector |
| October 18, 2022 | S&P MidCap 400 | Addition | Westlake | WLK | Materials |
| S&P MidCap 400 | Deletion | MillerKnoll | MLKN | Industrials | |
| S&P SmallCap 600 | Addition | MillerKnoll | MLKN | Industrials | |
| S&P SmallCap 600 | Deletion | Covetrus | CVET | Health Care |
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