---
title: "Solaris Energy Infrastructure Set to Join S&P SmallCap 600 | SEI Stock News"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/292246200.md"
description: "Solaris Energy Infrastructure Inc. (SEI) will be added to the S&P SmallCap 600 index, replacing Catalyst Pharmaceuticals Inc. (CPRX), effective prior to market open on July 15, 2026. This change follows Angelini Pharma S.p.A.'s acquisition of Catalyst Pharmaceuticals."
datetime: "2026-07-09T13:47:00.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/292246200.md)
  - [en](https://longbridge.com/en/news/292246200.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/292246200.md)
generator: "portal-rs"
---

# Solaris Energy Infrastructure Set to Join S&P SmallCap 600 | SEI Stock News

, /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** 

**Action**

**Company Name**

**Ticker**

**GICS 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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---
> **Disclaimer: This article is for reference only and does not constitute any investment advice.**