NEW YORK, July 9, 2026 /PRNewswire/ -- Solaris Energy Infrastructure Inc. (NYSE: SEI) will replace Catalyst Pharmaceuticals Inc. (NASD: CPRX) in the S&P SmallCap 600 effective prior to the opening of trading on Wednesday, July 15. Angelini Pharma S.p.A. is acquiring Catalyst Pharmaceuticals in a deal expected to close soon, pending final closing conditions.
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     Â
Action
Company Name
Ticker
GICSÂ Sector
July 15, 2026
S&P SmallCap 600
Addition
Solaris Energy Infrastructure
SEI
Energy
July 15, 2026
S&P SmallCap 600
Deletion
Catalyst Pharmaceuticals
CPRX
Health Care
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