According to @KobeissiLetter, Robinhood stock (HOOD) surged nearly 10 percent on news it will be added to the S&P 500, reported on Sep 5, 2025 (source: @KobeissiLetter).

According to @EricBalchunas, MicroStrategy (MSTR) did not receive the anticipated inclusion, and the stock is down about 2% intraday (source: Eric Balchunas on X, Sep 5, 2025). No additional details on what inclusion refers to were provided in the post, limiting visibility into the driver beyond the immediate price reaction (source: Eric Balchunas on X, Sep 5, 2025).

According to @Andre_Dragosch, $MSTR is among the top two companies currently eligible for an index addition today, and he would be surprised if it is not added. Source: Andre Dragosch on X, Sep 5, 2025. He cited a chart by @JSeyff to support the eligibility ranking. Source: Chart via @JSeyff as referenced by Andre Dragosch on X, Sep 5, 2025. If an addition is confirmed, index changes typically trigger passive fund buying and rebalance-related flows that can impact short-term price, volume, and spreads for the added stock. Source: S&P Dow Jones Indices research on index rebalancing effects. MicroStrategy holds a large amount of Bitcoin on its balance sheet, and the company discloses that Bitcoin price fluctuations can materially affect its stock price, linking MSTR performance to BTC conditions during such events. Source: MicroStrategy Investor Relations disclosures and Form 10-K risk factors.