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Slack (company)

Slack (company)

Slack Technologies or Slack is a company operating a messaging platform that enables teams to communicate. It provides real-time messaging, archiving and searching services.

Slack is a communication tool in which chats happens in channels, are organized by project, topic, or team. Conversations are searchable.

Slack was incorporated in 2009 as Tiny Spec, Inc. Later in 2009, they changed name to Tiny Speck, Inc. and in 2014 changed name to Slack Technologies, Inc.


April 26, 2019
Slack made its IPO filing public
August 2018
Slack raises a $427,000,000 series H round from Accel Partners, Baillie Gifford, Dragoneer Investment Group, General Atlantic, Sands Capital Ventures, SoftBank Vision Fund and T. Rowe Price.
September 2017
Slack raises a $412,000,000 series G round from Accel Partners, Global Founders Capital, Riverside Ventures and SoftBank Vision Fund.
April 2016
Slack raises a $208,000,000 series F round from ACME Capital, Accel Partners, Comcast Ventures, GGV Capital, Index Ventures, Institutional Venture Partners, Lowercase Capital, Social Capital and Thrive Capital.
April 2015
Slack raises a $172,000,000 series E round from FundersClub, Google Ventures, Groupe Arnault, Horizons Ventures, Index Ventures, Institutional Venture Partners, Kleiner Perkins Digital Growth Fund, Slow Ventures, Social Capital and Spark Capital.
October 2014
Slack raises a $120,000,000 series D round from Accel Partners, Andreessen Horowitz, Kleiner Perkins Digital Growth Fund, Slow Ventures and Social Capital.
April 2014
Slack raises a $42,750,000 series C round from Accel Partners, Andreessen Horowitz, FundersClub and Social Capital.
April 2011
Slack raises a $10,700,000 series B round from Accel Partners and Andreessen Horowitz.
April 2010
Slack raises a $5,000,000 series A round from Accel Partners and Andreessen Horowitz.
Slack was founded by Cal Henderson and Stewart Butterfield.

Funding rounds



Further reading


The Slack Fund doubles down on investment with the launch of a $100M Fund III



Documentaries, videos and podcasts


Work in progress | Slack

August 12, 2021


Natasha Lomas
October 7, 2021
Cord, a startup that offers a single API to add Slack-like collaboration features to any app, has bagged $17.5 million in Series A funding. The round -- which is pegged to fund product development, including by hiring engineers, designers and product managers -- was led by European VC Index. Other investors participating include NFX and [...]
Natasha Lomas
October 1, 2021
The future of office work, post-COVID-19, is driving plenty of startup activity. Not just around core business needs like comms (Zoom, Slack et al) -- but entrepreneurs are also competing to come up with the perfect tool to recreate the social serendipity of office life in order to make dispersed workers feel a bit more [...]
Romain Dillet
September 30, 2021
TechCrunch has raised a $4.7 million funding round led by Index Ventures and Point Nine. When your company is facing an outage or a data breach, provides the right framework to communicate about the issue -- both internally and externally -- and make sure it is resolved as quickly as possible. In addition to [...]
Brian McKenna
September 22, 2021
Marc Benioff, CEO and chair of Salesforce, declares his company net zero in a keynote at Dreamforce 2021 in San Francisco, alongside update on Slack integrations
Ron Miller
September 21, 2021
Slack has been talking about expanding beyond text-based messaging for some time. Today at Dreamforce, the Salesforce customer conference taking place this week, it announced Clips, a way to leave short video messages that people can watch at their leisure. Slack CEO Stewart Butterfield sees Clips as a way to communicate with colleagues when a [...]


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