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Fast growing San Francisco startup Slack Technologies is seeking more than $150 million in its latest round of funding, according to a report from The Wall Street Journal.

Slack has raised $340 million for its business messaging app and was valued at $2.8 billion in March 2015, according to the report. A person familiar with the company s new fundraising round told the Journal that Slack is seeking an even higher valuation this time around.

Slack s prior investors include Accel Partners, Andreessen Horowitz, Index Ventures and Kleiner Perkins Caufield & Byers, the Journal reported.

Slack soared to a $1 billion unicorn valuation less than a year after launching its app, Fortune reported last year. At the time the company was growing as much as 7 percent each week. More than two million people use Slack every day, up from 500,000 daily users a year ago, according to a February blog post by the company. The team has grown from 103 to 369 employees.

Slack acquired voice chat and screen sharing company Screenhero last year, and on Monday announced it s working on seamlessly turning a text chat into a voice or video chat, Tech Crunch reported. Slack reportedly plans to begin testing the new feature very soon.

Slack s rapid growth comes during a challenging economic time. A volatile stock market has led to a complete freeze of Silicon Valley tech IPOs, venture capitalists are becoming more selective with their funding, companies such as Foursquare and Jawbone have had to slash their valuations to raise additional funding, and industry experts are questioning whether some unicorns have become overvalued.

The post Slack seeks $150 million in funding appeared first on SiliconBeat.

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