Venture Capital

Why Messaging Startup Slack Keeps Raising Money It Doesn’t Need

Tech workers love to see their employer’s valuation number continue growing, the CEO says.

Slack CEO Stewart Butterfield

Photographer: Chris Goodney/Bloomberg

Slack Technologies Inc.'s product is only two years old, yet the corporate messaging startup has already raised more than $300 million. And it's not stopping there. The San Francisco company has been looking to raise between $150 million and $300 million more, Bloomberg reported this month.

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