The S&P 500 Summer Massacre. Making America Ground AgainE-mini S&P 500 Futures (Sep 2026)CME_MINI_DL:ESU2026PandorraResearchHooray! Hooray! Take your seats, since Summer Massacre aka "Sell In May" is here again. 👉 "Sell in May and go away" is a saying referring to the historically weaker financial market performance from May to October compared to the other half of the year. 👉 Investors can try to capitalize on this pattern by shifting to less risky assets from May to October, based on historical data. Seasonality in investment flows may persist as a result of year-end bonuses for the financial industry and businesses, possibly spurred by the mid-April deadline for filing US income tax returns. Whatever the underlying fundamentals, the historical pattern was exacerbated by the October stock market crashes of 1987 and 2008. Understanding Memorial Day Memorial Day is a federal holiday in the United States dedicated to mourning U.S. service members who have died in the line of duty in the U.S. Armed Forces. It is always observed on the last Monday in May, or on a day between May 25 and May 31 (in 2026, it was observed on May 25, a three week before, and then a week after Bulls market shifted into Bears flip). A historical backtest—an analysis we conducted on available data for the S&P 500 and the cryptocurrency market—clearly indicates that the week following Memorial Day is literally a litmus test for market dynamics over the next months until November. The red color of this weekly bar clearly indicates an exodus of money from the market at the end of May and the subsequent prevailing bearish trend, while the growth and green color of the weekly candlestick suggest that participants and money remain in the market, despite its historically known seasonality. Concluding Points Our certain considerations regarding the possible development of geopolitical events between May and October 2026 reasonably suggest the viability of such a scenario for the upcoming future.