Allison Transmission to join S&P MidCap 400; GT to join SmallCap 600
Jun 30, 2026, 5:45 PM EDT1 sourcesAI-analyzed
Why it may matterVerify against the original reporting
Index removals typically trigger short-term selling from passive funds tracking the removed index; GT could face pressure around July 6, 2026, with可能 1–3% move depending on ETF flows and liquidity. ALSN may see modest upside from inflows; historical moves in similar reconstitutions show muted to modest repercussions unless paired with company-specific catalysts.
AI summary
What happened, with direct paths to the underlying reporting
S&P Dow Jones Indices announced changes: Allison Transmission will replace Goodyear Tire in the MidCap 400, while GT moves to the SmallCap 600; Stellar Bancorp is exiting SmallCap due to Prosperity Bancshares' acquisition, set to close July 1. The shifts take effect before the market open on July 6, 2026, and could generate passive-flow trading impacts on GT and ALSN as funds rebalance.
Allison Transmission to join S&P MidCap 400, replacing GT. Effective July 6, 2026.
Stellar Bancorp to be acquired by Prosperity Bancshares; close expected July 1, 2026.
Reconstitution may trigger passive fund flows and price moves for GT and ALSN.
How to read this signal
Transparent limits for an AI-generated research aid
StockNews.AI groups source reporting, classifies the event, and measures subsequent price movement. This is informational research, not investment advice. Prices may be delayed or unavailable.
Related signals
More source-backed signals connected by company or event
GT's latest quarterly figures indicate a strong growth trajectory, primarily driven by rising demand forecasts for its products. This growth could position GT favorably in the upc…
Goodyear reported a loss of 17 cents per share, missing analyst expectations. Revenue of $4.46 billion fell short of forecasts, indicating ongoing struggles. Tariffs are a signifi…
