March 9 was supposed to be the start of a new routine for JPMorgan Chase & Co. employees. With coronavirus spreading, the bank had told the staff in its stock-trading operation to head to three separate sites around New York City.

Hours before the workday began, with global markets plunging, technology at the sites wasnt ready. JPMorgan top brass reversed the order and told many traders to report for duty, as usual, to the firms Manhattan headquarters, employees said.

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Anatomy of an Outbreak: How Coronavirus Swept Through JPMorgans Trading Floor - The Wall Street Journal