Go away in May but come back when?

The Wall Street adage “Sell in May and go away” looks to be spot on this year. At the close yesterday on May 18, the Invesco QQQ Trust ETF (QQQ), which tracks the NASDAQ 100, was still p 2.83% for 2021, but down 2.96% for the last three months and off 5.79% for the last month. But the full saying in its original form runs “Sell in May and go away; Don’t come back until St. Leger’s Day.” St. Leger’s Day marked the running of the third race in the British Triple Crown, which took place in September. The advice was to sell ahead of the quiet summer London social season. The adage as I learned it (not in England between the wars, mind you, since I’m not either that old or that patrician) advised to “Buy on NEA,” the big technology and venture capital conference usually held in November. That seasonal timing strategy let investors reap the gains from, historically, the six best months of the yer (November through April) and avoid the sluggish performance of May through October. From 1950 through 2019 the November through April period of each year saw the Standard & Poor’s 500 gain 2283.7 points, according to calculations by Jeffrey Hirsch in the Stock Trader’s Almanach. That’s against gains of just 610.79 points in the worst six months during that period. But this year? When should an investor or trader who has sold in May think about coming back?