NEW YORK, NY - JUNE 20: Stewart Butterfield, co-founder and chief executive officer of Slack, stands outside the New York Stock Exchange (NYSE) before the opening bell, June 20, 2019 in New York City. The workplace messaging app Slack will list on the New York Stock Exchange this morning. NYSE set the reference price for the direct listing at $26 per share late on Wednesday. (Photo by Drew Angerer/Getty Images)
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