Allison Transmission Holdings Set to Join S&P MidCap 400 and Goodyear Tire & Rubber to Join S&P SmallCap 600

NEW YORK, June 30, 2026 /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:

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