After raising $160 million 10 months ago, the $2.8 billion startup Slack wants another $150 million

Slack, the red-hot messaging startup last valued at $2.8 billion, is in talks to raise another $150 million, the WSJ's Yuliya Chernova reported Wednesday.

The report added that Slack's new round of funding could give it an even higher valuation. The company has raised roughly $340 million so far, including a $160 million Series E round in April 2015.

Slack wasn't available for comment immediately.

Slack is often called one of the fastest growing business apps in history. Since its official launch just two years ago, Slack has added 2.3 million monthly active users and says it's on track to generate roughly $64 million in annual revenue.

Just last week, Slack CEO Stewart Butterfield said that 20% of all of its monthly active users started using the app for the first time this year.

The new funding would be a reflection of Slack's strong growth and investor confidence in the fast-growing startup. There's been multiple reports about the VC funding environment drying up lately, and the market for tech IPOs is in a holding-pattern.

But the fact that Slack is raising another mega-round, less than a year after raising at a $2.8 billion valuation, in a tough funding environment could be a testament to its healthy growth and financial situation.