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 wasn’t ready. JPMorgan top brass reversed the order and told many traders to report for duty, as usual, to the firm’s Manhattan headquarters, employees said.

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