Raised in a Log Cabin, Slack Chairman Is Now Worth $1.3 Billion

Stewart ButterfieldPhotographer: Noah Berger/AFP via Getty Images
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Canadian entrepreneur Stewart Butterfield helped found Slack Technologies Inc. after selling his earlier startup, Flickr, to Yahoo for more than $20 million. The latest venture is bringing a bigger windfall.

His 8% stake in the workplace communication company would be worth $1.3 billion if Slack goes public this week at $16 billion, the low end of Wall Street’s expected range. Slack co-founder Cal Henderson, 38, owns 3% worth about $533 million.