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.

Money Talk·July 1, 2026·reads: 1,497

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.