Allen Shim, chief financial officer of Slack Technologies Inc., left center, and Stewart Butterfield, chief executive officer of Slack Technologies, Inc.. (Photographer: Michael Nagle/Bloomberg)

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

(Bloomberg) -- 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.

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