The transition will take effect before the opening of trading on Wednesday, July 15. Solaris Energy Infrastructure, which trades under the ticker SEI, will represent the energy sector within the index. Catalyst Pharmaceuticals, trading as CPRX, will be removed as its acquisition by Angelini Pharma S.p.A. nears completion. S&P Dow Jones Indices manages these adjustments to ensure the index accurately reflects the composition of the small-cap market as corporate mergers and acquisitions reshape the landscape.
Solaris Energy Infrastructure to Join S&P SmallCap 600
Solaris Energy Infrastructure will join the S&P SmallCap 600 index on July 15, 2026, taking the spot currently held by Catalyst Pharmaceuticals. The shuffle follows the pending acquisition of Catalyst Pharmaceuticals by Angelini Pharma S.p.A., which prompted the removal of the healthcare firm from the benchmark index.
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