---
title: "Why Solaris Energy Infrastructure (SEI) stock is up today"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/292353370.md"
description: "Solaris Energy Infrastructure (SEI) shares rose 5.9% after S&P Dow Jones Indices announced its inclusion in the S&P SmallCap 600 index, effective July 15. This addition replaces Catalys."
datetime: "2026-07-10T19:59:47.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/292353370.md)
  - [en](https://longbridge.com/en/news/292353370.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/292353370.md)
---

# Why Solaris Energy Infrastructure (SEI) stock is up today

What Happened? Shares of mobile power and logistics company Solaris Energy Infrastructure (NYSE:SEI) jumped 5.9% in the afternoon session after S&P Dow Jones Indices announced the company will be added to the S&P SmallCap 600 index. The inclusion will be effective prior to the opening of trading on Wednesday, July 15, with Solaris replacing Catalys...

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## Related News & Research

- [Castleark Management LLC Has $5.33 Million Holdings in Solaris Energy Infrastructure, Inc. $SEI](https://longbridge.com/en/news/294026857.md)
- [Solaris Energy Analyst Expects Earnings To Grow ‘Several-Fold’](https://longbridge.com/en/news/291168539.md)
- [Gunderson Capital Management LLC Invests $3.41 Million in Solaris Energy Infrastructure, Inc. $SEI](https://longbridge.com/en/news/291054444.md)
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