Investing.com -- Allison Transmission Holdings Inc. will join the S&P MidCap 400 index, while Goodyear Tire & Rubber Co. will move to the S&P SmallCap 600, effective before trading begins on July 6.

Goodyear Tire & Rubber will leave the S&P MidCap 400 and enter the S&P SmallCap 600, taking the place of Stellar Bancorp Inc..

Prosperity Bancshares Inc., a current member of the S&P MidCap 400, is acquiring Stellar Bancorp in a transaction scheduled to close on July 1.

Allison Transmission operates in the industrials sector, while Goodyear Tire & Rubber is classified under consumer discretionary. Stellar Bancorp belongs to the financials sector.