Slack raises $200 million at $3.8 billion valuation

Workplace collaboration platform Slack just confirmed that it has raised $200 million in venture financing at a post-money valuation of $3.8 billion.

The round was led by Thrive Capital with participation by GGV, Comcast Ventures, and Slack's existing investors, including major new investments by Accel, Social Capital, Spark Growth and Index Ventures.

Since April 2014, the San Francisco-based company has raised a total of $540 million.

"As has always been the case, we are taking this opportunity to further secure our leadership position as we continue to execute on our ambitious growth plans. This capital adds to our existing reserves and increases our ability to focus on an uncompromising long-term, strategic view," said Slack CEO and co-founder Stewart Butterfield.

As of today, the budding company claims to have 2.7 million daily active users, 800,000 paid users and 430 employees. Customers include CenturyLink, CBS, Dow Jones, the Federal Aviation Administration, Harvard University, Samsung, and the U.S. State Department.

The company has been quite active over the last six months with introducing new features taking on both traditional email as well as other cloud-based chat services.

In December, Slack launched a new $80 million early-stage investment fund to be doled out to other companies with "Slack-first" apps.

In October, Slack opened up the option for establishing user groups, allowing users to mass-message entire departments within an organization rather than just posting a message to a channel. Slack also updated its API in accordance with the groups function, enabling developers to build apps that support programmatic group creation and management.

In June, Slack hired Google and Twitter vet April Underwood to oversee API integrations and developer relations, among other platform-related products.