MoonCakeyUSA
254 posts










🚨🚨🚨Next week FinTwit will be flooded with "Sell in May and go away" takes. Every year, same adage, same fear. We ran 9 statistical tests on it before the noise starts. 22 years. $SPY and $QQQ. Every May-October period since 2003. May-October was positive 77% of the time in $SPY and 81% in $QQQ. The adage implies summer is negative. It's positive 4 out of 5 years. Binomial test confirms: significantly different from a coin flip (p = 0.017). "The seasonal difference isn't real. In $SPY, the gap between May-Oct and Nov-Apr returns has a p-value of 0.49 which is statistically indistinguishable from a coin flip. In $QQQ, May-Oct actually returns MORE than Nov-Apr. Bootstrap confidence interval includes zero for both indices. There is no seasonal edge." The cost of following the adage: $10,000 invested in Buy & Hold grew to $69,649 in $SPY and $195,026 in $QQQ. The "Sell in May" strategy: $34,333 and $44,603. You lose $35,316 in $SPY, 50.7% of your terminal wealth. In $QQQ, you lose $150,423, 77.1%. The adage costs you more than it saves you. The real problem month is September (-0.60%), not May (+0.72%). July is the strongest summer month (+1.97%, p < 0.01). The adage is named after the wrong month. Summer is actually safer. Probability of a >10% drawdown in 60 days: 16% in summer vs 24% in winter for $SPY. The "dangerous" season has lower drawdown risk at every horizon we tested. The edge has decayed and reversed. From 2021-2026, May-Oct outperformed Nov-Apr by +4.4% in $SPY and +7.8% in $QQQ. The adage doesn't just fail, it's backwards now. We tested the event window. In the 10 days before May 1st, $SPY averages +0.74% with a 73% win rate. The market rallies into May. Nobody is actually selling. Sell in May and go away. To where? The market was positive 77% of the summers you missed. The adage cost you half your portfolio. The seasonal difference has a p-value of 0.49 which is statistically indistinguishable from noise. $SPY $QQQ $SPX











The observed short-term positive correlation between “higher inflation” (specifically the Inflation Matrix’s “both hot” quadrant: CPI + PPI both hotter-than-expected vs. consensus) and equity valuation gains (+1.44% SPY / +2.67% QQQ average 20-day forward) is a statistical artifact. No robust logical mechanism or independent evidential causality supports it.











Best under for today⚽️








