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Traders work on the floor of the New York Stock Exchange (NYSE) in New York, U.S., March 20, 2020.

On the morning of Sept. 3, the market began to fall, led on the descent by the same technology stocks that had captained the gravity-defying charge upward since late March. Despite being bullish for months, my partners and I appraised the August surge more as a feeding frenzy than the thoughtful recalibration of improving valuations. We had begun the process of trimming positions in stocks that had far surpassed our wildest dreams during a pandemic and global recession.

I attributed my personal case of hyperventilation to a fearsome combination of three factors: the S&P index had touched a 10% gain for the year; its largest five components comprised 27% of the total market value; and a group of stocks, such as Tesla, Zoom, Peloton, and Shopify, all COVID-helped names, had gone vertical. 

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