Not bad for recycled Internet Relay Chat
"Slack Technologies Inc. is expected to be valued by investors at $16 billion to $17 billion when it lists its shares publicly next week, according to people familiar with the matter.Slack Listing Likely to Value It at Up to $17 Billion | Bloomberg
That valuation is roughly based on the workplace chat and collaboration software company’s projected revenue and current growth rate, said the people, who asked not to be identified discussing private talks.
The expected value is up from the $7.1 billion in its last private funding round in August. It’s similar to the company’s share sales on the private market, where in April investors were snapping up stock at prices that would give the company a valuation of about $16 billion."