S&P Dow Jones Indices Announces MidCap and SmallCap Rebalancing
The S&P MidCap 400 and S&P SmallCap 600 indices will undergo a structural shift on July 6, 2026, as Prosperity Bancshares’ acquisition of Stellar Bancorp triggers a domino effect across market tiers. This transition reflects the ongoing consolidation within the financial sector and changing valuations among industrial and consumer firms.

Allison Transmission Holdings is set to join the S&P MidCap 400, stepping into the position currently held by Goodyear Tire & Rubber. Simultaneously, Goodyear will move down to the S&P SmallCap 600, replacing Stellar Bancorp. These adjustments take effect before the market opens on Monday, July 6. The shuffle follows Prosperity Bancshares’ move to acquire Stellar Bancorp, a transaction slated to close on July 1. By reclassifying Goodyear and integrating Allison Transmission, index managers maintain the representative integrity of both the MidCap and SmallCap benchmarks.
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