How the ‘buy Yom Kippur sell Rosh Hashana’ trading theme is playing out in the stock market in 2021

It may be a quirk of seasonality or investing folklore. Either way, the investing strategy known unofficially as a “Sell Rosh Hashana, Buy Yom Kippur” often adheres to a common pattern, with markets slumping in September, only to gain some traction higher in October, followed by a better seasonal trading period in November.