Allison Transmission to join S&P MidCap 400; shares up

* Allison Transmission (ALSN [https://seekingalpha.com/symbol/ALSN]) will replace [https://seekingalpha.com/pr/20569406-allison-transmission-holdings-set-to-join-s-and-p-midcap-400-and-goodyear-tire-and-rubber-to] Goodyear Tire & Rubber (GT [https://seekingalpha.com/symbol/GT]) in the S&P MidCap 400, effective before market open on July 6, 2026.
* Goodyear Tire & Rubber will move to the S&P SmallCap 600, replacing Stellar Bancorp (STEL [https://seekingalpha.com/symbol/STEL]).
* The index changes follow Prosperity Bancshares' acquisition of Stellar Bancorp, which is expected to close July 1, 2026.
* ALSN shares up 6.4% post-market.

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