NEW YORK, May 27, 2021 /PRNewswire/ -- Organon & Co. (NYSE: OGN) will be added to the S&P 500 prior to the open of trading on Thursday, June 3, replacing HollyFrontier, which will be removed from the S&P 500 effective prior to the open of trading on Friday, June 4.

HollyFrontier will replace Service Properties Trust (NASD:SVC) in the S&P MidCap 400, and Service Properties Trust will replace Lannett Co Inc. (NYSE:LCI) in the S&P SmallCap 600 also effective prior to the open on June 4. S&P 500 and 100 constituent Merck & Co (NYSE: MRK) is spinning off Organon (NYSE: OGN) in a transaction expected to be completed post close on Wednesday, June 2. Post spin-off, Merck will remain in the S&P 500 and 100 indices.  HollyFrontier has a market capitalization more representative of the mid-cap market space. Lannett is no longer 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:

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