---
title: "Allison Transmission Holdings Set to Join S&P MidCap 400 and Goodyear Tire & Rubber to Join S&P SmallCap 600 | GT Stock News"
type: "News"
locale: "en"
url: "https://longbridge.com/en/news/291338429.md"
description: "Effective July 6, 2026, Allison Transmission Holdings (ALSN) will be added to the S&P MidCap 400, replacing Goodyear Tire & Rubber (GT). Concurrently, Goodyear will replace Stellar Bancorp (STEL) in the S&P SmallCap 600. These changes follow Prosperity Bancshares' acquisition of Stellar Bancorp."
datetime: "2026-06-30T13:41:00.000Z"
locales:
  - [zh-CN](https://longbridge.com/zh-CN/news/291338429.md)
  - [en](https://longbridge.com/en/news/291338429.md)
  - [zh-HK](https://longbridge.com/zh-HK/news/291338429.md)
generator: "portal-rs"
---

# Allison Transmission Holdings Set to Join S&P MidCap 400 and Goodyear Tire & Rubber to Join S&P SmallCap 600 | GT Stock News

, /PRNewswire/ -- Allison Transmission Holdings Inc. (NYSE: ALSN) will replace Goodyear Tire & Rubber Co. (NASD: GT) in the S&P MidCap 400, and Goodyear Tire & Rubber will replace Stellar Bancorp Inc. (NYSE: STEL) in the S&P SmallCap 600 effective prior to the opening of trading on Monday, July 6. S&P MidCap 400 constituent Prosperity Bancshares Inc. (NYSE: PB) is acquiring Stellar Bancorp in a deal expected to close July 1.

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 6, 2026**

S&P MidCap 400

Addition

Allison Transmission

ALSN

Industrials

**July 6, 2026**

S&P MidCap 400

Deletion

Goodyear Tire & Rubber

GT

Consumer Discretionary

**July 6, 2026**

S&P SmallCap 600

Addition

Goodyear Tire & Rubber

GT

Consumer Discretionary

**July 6, 2026**

S&P SmallCap 600

Deletion

Stellar Bancorp

STEL

Financials

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### Related Stocks

- [ALSN.US](https://longbridge.com/en/quote/ALSN.US.md)
- [STEL.US](https://longbridge.com/en/quote/STEL.US.md)
- [GT.US](https://longbridge.com/en/quote/GT.US.md)
- [PB.US](https://longbridge.com/en/quote/PB.US.md)
- [.SPX.US](https://longbridge.com/en/quote/.SPX.US.md)
- [.DJI.US](https://longbridge.com/en/quote/.DJI.US.md)
- [SPGI.US](https://longbridge.com/en/quote/SPGI.US.md)

## Related News & Research

- [Martin & Co. Inc. TN Invests $2.25 Million in Prosperity Bancshares, Inc. $PB](https://longbridge.com/en/news/296699075.md)
- [Empowered Funds LLC Acquires New Stake in Allison Transmission Holdings, Inc. $ALSN](https://longbridge.com/en/news/297397802.md)
- [36,178,149 Shares in The Goodyear Tire & Rubber Company $GT Acquired by BlackRock Inc.](https://longbridge.com/en/news/297280913.md)
- [Insider Selling: Prosperity Bancshares (NYSE:PB) Director Sells 500 Shares of Stock](https://longbridge.com/en/news/297104829.md)
- [Cheuk Nang says GT quit over unquantified external expert fees dispute](https://longbridge.com/en/news/296774494.md)

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