@horizontradingai: Build and backtest your own free at horizontrading.ai 👇 Sell in May is half true. Twenty years still lose to sitting still. HorizonAI built the winter-long summer-flat rule from one sentence and ran it on 20 years of S&P 500 daily bars. It does dodge the worst summers. It also misses the bull runs and finishes at +$11,860 against buy and hold at +$28,420. The consistency check shows the edge fading in the last two of five periods. Save this before you trust an old saying with real money. #trading #backtesting #algotrading #sp500 #sellinmay #seasonality #tradingstrategy #stockmarket #buyandhold #stresstest #quanttrading #indextrading #horizonai #swingtrading #backtest #profitfactor #technicalanalysis #marketseasonality #spx #investing