
In 2016, Slack was ranked #1 on the Forbes Cloud 100 list. In April 2016, Slack raised another $200 million, led by Thrive Capital, with participation by GGV, Comcast Ventures and existing investors, including Accel, Index Ventures, and Social Capital.

In May 2015, Social Capital was a leading investor in a funding round for Slack Technologies. In April 2015, the company raised another $160 million. New investors include Institutional Venture Partners, Horizons Ventures, Index Ventures, and DST Global.

In March 2015, Slack signed a deal with investors to raise up to $160 million in a funding round that valued the company at $2.76 billion. In January 2015, Slack announced the acquisition of Screenhero, a specialist in voice, video, and screen sharing. Earlier investors Andreessen Horowitz, Accel, and Social Capital also participated in this round. In October 2014, the company raised $120 million in venture capital with a $1.2 billion valuation led by Kleiner Perkins and GV. The company raised $42.75 million in April 2014. Slack had been an internal tool used for the development of Glitch. The name is an acronym for "Searchable Log of All Conversation and Knowledge". After the launch of Slack, the company renamed itself to Slack Technologies in August 2014. The New York Stock Exchange Building after Slack's direct offering on the NYSE – June 20, 2019Īfter the closure of Glitch, the company launched the Slack real-time collaboration app and platform, raising $17 million in funding from Andreessen Horowitz, Accel, and Social Capital. In November 2012, it was announced that Glitch would be closed, effective December 9, 2012. Glitch launched on September 27, 2011, but subsequently "unlaunched" on 30th November to improve gameplay. The gameplay was described as follows: "players must learn how to find and grow resources, identify and build community and, at the higher levels of the game, proselytize to those around them". Tiny Speck's first product was a computer game called Glitch-a social MMORPG with highly stylized 2D graphics. A Series B round of $10.7 million was raised in 2011. Tiny Speck received angel funding of $1.5 million in 2009, followed by Series A funding of $5 million in 2010 from Accel and Andreessen Horowitz.

The company goes back to the San Francisco based startup Tiny Speck, which was headed by Stewart Butterfield, the co-founder of the photo sharing site Flickr. Slack logo used between August 2013 and January 2019 Initial funding and Glitch
