On Thursday, June 25, 2026, traders on the floor of the New York Stock Exchange participated in the initial public offering of DPC Holdings Ltd.

This week's market saw several pivotal events: Micron Technology's stock surged by double digits following its earnings report, U.S. GDP and inflation data came in strong, and Apple's stock experienced a significant decline.

Logically, these combined factors should have driven substantial market movement for U.S. stocks on Thursday. However, the S&P 500 index closed at a level nearly identical to Wednesday's close.

Traders initially sold off long positions that had risen with Micron overnight, causing the Nasdaq 100 futures to retreat 3% from their morning highs. Later, the market saw dip-buying in the second half of the session, allowing the tech-heavy index to ultimately close up 0.75% for the day.

The phenomenon of the index returning to its starting point after such volatility suggests institutional market makers may be holding option positions that profit from market volatility. When significant price swings occur, these market makers tend to take profits—buying back put options during market declines and selling call options during sharp rallies.

This type of activity effectively pins the stock index within a defined range, a situation known in options trading as being "long gamma." Dealers, who typically sell options, often prefer to hold cheaper out-of-the-money option contracts as expiration nears. The current monthly options cycle is set to expire on Tuesday, June 30.

Brent Kochuba, founder of options data analytics firm SpotGamma, stated, "Currently, market makers are in a long gamma position for both broad indices and major individual stocks, which is a core reason for the market's stabilizing trend. This calm state could be completely disrupted by events such as a re-rating of AI sector valuations, an industry-wide black swan event similar to DeepSeek, or if market expectations shift towards further interest rate hikes."

Despite U.S. Q4 GDP growth exceeding expectations at 2.1% and the Personal Consumption Expenditures (PCE) inflation rate rising to 4.15%—its highest level since April 2023—the bond market remained relatively stable on Thursday. The long-term U.S. Treasury ETF (TLT) closed with a movement of only 3 basis points.

Based on Kochuba's analysis, if the S&P 500 index were to fall below the 7200 level, market makers would likely step in to buy. Conversely, if the index were to rise above 7400, they would likely sell into the strength.