On the last trading day of May 2025, the U.S. stock market experienced notable market-on-close (MOC) imbalances, reflecting significant trading activity as the month ended. On May 28, the S&P 500 showed a sell imbalance of approximately $679.1 million, the Nasdaq 100 $233.8 million, and the Dow 30 $337.8 million, with the MAG 7 stocks at $67.3 million. By May 29, these imbalances shifted dramatically to a strong buy side, with the S&P 500 reaching a $3.26 billion buy imbalance, Nasdaq 100 $1.5 billion, Dow 30 $1 billion, and MAG 7 stocks $867.7 million. Overall, the NYSE reported a $4.8 billion buy imbalance near market close on May 29, highlighting substantial end-of-month inflows. Market analysts noted that such month-end flows often lead to unusual market behavior and potential volatility, with some anticipating a typical sell-off on the final day of May followed by a possible bounce in early June. The trading patterns underscore the impact of end-of-month portfolio adjustments and institutional money flows on major U.S. equity indices including the S&P 500, Nasdaq 100, Dow 30, and leading technology stocks represented by the MAG 7.