Slack Shares Open at $38.50 on NYSE After Unusual Direct Listing

Slack CFO Says Aim Is to Drive Toward Cashflow Break Even
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Slack Technologies Inc. opened at $38.50 on the New York Stock Exchange Thursday, valuing the office chat software maker at about $19.5 billion.

Shares started trading at 12:08 p.m., almost three hours after Slack Chief Executive Officer Stewart Butterfield rang the opening bell at the exchange.