
S&P 500 does not have strict rules but a committee to pick additions and removals. Last change was December 1.
Wikipedia tracks the additions and removals:

All markets resolve at the next S&P change after December 5. Official announcements by S&P here.
Added stocks resolve YES and others NO.
Close date might be extended.
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@GabeGarboden I don't understand your question. All resolve at once when the next announcement is made.
ELS and PLTR were previous candidates.
KKR and APO were suggested in this article.
Other potential candidates for admission to the S&P 500 are KKR and Apollo Global Management, both alternative asset managers. Industry leader Blackstone was added in September and index watchers think KKR and Apollo, which are among the next largest alternative managers, could be next.
More suggestions welcome!