Slack Technologies
Enterprise collaboration software company behind the Slack workplace communication platform.
Last updated August 21, 2026
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Overview
Slack Technologies, LLC was an American software company best known for developing Slack, a workplace collaboration and communication platform. The company originated in Vancouver in 2009 as Tiny Speck, a startup founded and led by Stewart Butterfield, who had previously co-founded Flickr. Tiny Speck initially pursued Glitch, a social massively multiplayer online game. During the development of Glitch, the company built an internal messaging system to help its distributed team communicate, search discussions, share files, and coordinate work. Although Glitch was launched in 2011, it was closed in December 2012 after the company determined that the game had not achieved a sustainable product-market fit. The internal communication tool proved more promising, and Tiny Speck redirected its business toward that software. The collaboration product was released publicly in 2013. Its name, Slack, was commonly explained as an acronym for “Searchable Log of All Conversation and Knowledge,” reflecting the product’s emphasis on retaining and retrieving workplace information rather than relying only on transient chat. The service organized discussions into channels and direct messages and supported file sharing, searchable archives, notifications, application integrations, and later voice, video, screen sharing, workflow automation, and administrative controls. This positioning distinguished Slack from traditional email and from narrower instant-messaging products by presenting workplace communication as a searchable, extensible software layer. The company adopted the Slack Technologies name in August 2014 and attracted substantial venture investment as adoption grew among technology companies, startups, and larger enterprises. Its funding rounds supported international expansion, product development, and acquisitions, including Screenhero, whose voice, video, and screen-sharing capabilities complemented Slack’s core messaging service. Slack also developed a broad integration ecosystem and partner strategy, allowing customers to connect the platform with software used for project management, customer support, development, identity management, and productivity. Slack became a prominent enterprise-software company and pursued public-market access through a direct listing on the New York Stock Exchange on June 20, 2019, under the ticker WORK. Unlike a conventional initial public offering, the listing allowed existing shareholders to sell registered shares directly on the exchange without the company following the usual primary-share IPO structure. Slack subsequently competed intensely with Microsoft Teams and other workplace collaboration products. It also entered a strategic relationship with Atlassian after Atlassian shut down HipChat and Stride and transferred relevant intellectual property and user relationships to Slack. In December 2020, Salesforce announced an agreement to acquire Slack. The transaction was completed on July 21, 2021, after which Slack became part of Salesforce and its public listing ended. Slack continues as a Salesforce product and brand rather than as an independent publicly traded company. Its strategic role within Salesforce is to serve as a conversational and collaborative interface connecting employees, business applications, customer information, workflows, and increasingly automated or AI-assisted work processes. The company’s historical identity therefore spans a failed online game, an internally developed communication tool, a high-growth independent software company, and an enterprise collaboration business integrated into a larger cloud-software portfolio.
History
Slack Technologies began as Tiny Speck, a startup established in 2009 by Stewart Butterfield and based initially in Vancouver. The company raised early angel and venture financing to develop Glitch, an unusual social online game that emphasized exploration, community formation, resource gathering, and player creativity. Glitch entered public release in September 2011, but the game was temporarily withdrawn later that year for improvement and was ultimately shut down in December 2012. The most important product created during Glitch’s development was not the game itself but an internal communication system. Tiny Speck’s employees used the system to exchange messages, coordinate work, share files, and preserve an accessible record of decisions. After Glitch’s closure, the company recognized that this internal tool could address a broader business problem: workplace communication was fragmented among email, instant messaging, file repositories, and specialist applications. Tiny Speck converted the internal system into a commercial service and launched Slack in 2013. Slack’s central design combined persistent channels, direct messages, searchable archives, notifications, file sharing, and a large integration ecosystem. This made it useful both for live discussion and as an institutional memory for teams. In August 2014, the company changed its name to Slack Technologies. Adoption accelerated among technology businesses and later expanded into education, media, professional services, government-related organizations, and large enterprises. The company’s growth was supported by multiple financing rounds, including investment from Accel, Andreessen Horowitz, Social Capital, Kleiner Perkins, GV, Index Ventures, Institutional Venture Partners, Thrive Capital, GGV, Comcast Ventures, and SoftBank-related investors. Slack expanded its product capabilities and ecosystem through partnerships and acquisitions. Its 2015 acquisition of Screenhero strengthened voice, video, and screen-sharing functionality. In 2018, Atlassian announced that HipChat and Stride would be discontinued and that relevant intellectual property would be transferred to Slack. The arrangement also included a minority investment by Atlassian and a commitment to pursue integrations between Slack and Atlassian products. Slack simultaneously developed a partner channel and increased its focus on enterprise procurement, administration, security, and deployment. The company prepared for public-market access in 2018 and filed to use a direct listing in 2019. Slack began trading on the NYSE on June 20, 2019, under WORK. The listing became a notable example of a large technology company using a direct-market-access structure instead of a traditional underwritten IPO. Slack continued to expand its enterprise customer base, including a widely reported plan by IBM to deploy the service throughout its workforce. Slack’s independent period also brought regulatory and legal disputes. In 2020, it complained to the European Commission that Microsoft’s bundling of Teams with Microsoft 365 harmed competition. Investors separately brought securities litigation concerning Slack’s direct listing and allegedly misleading registration disclosures. The dispute, known as Slack Technologies, LLC v. Pirani, produced important judicial analysis of the traceability requirement for Securities Act claims. In June 2023, the U.S. Supreme Court rejected the broader interpretation adopted by the Ninth Circuit and required the plaintiff to establish that the purchased shares were traceable to the challenged registration statement. Salesforce announced its agreement to acquire Slack in December 2020. The transaction closed on July 21, 2021, after which Slack was delisted and integrated into Salesforce. Slack remains a distinct product and brand, but Slack Technologies is no longer an independent publicly traded company. Its post-acquisition role has centered on connecting people, conversations, applications, workflows, and Salesforce data within a broader enterprise-software ecosystem.
- 2021
Acquisition closes
[1]Salesforce completed its acquisition of Slack on July 21, ending Slack’s status as an independent listed company.
- 2020
Salesforce announces acquisition
[1]Salesforce announced an agreement to acquire Slack.
- 2019
Direct listing on the NYSE
[1]Slack began trading publicly on the New York Stock Exchange under ticker WORK through a direct listing.
- 2018
Atlassian collaboration arrangement
[1]Atlassian announced the shutdown of HipChat and Stride and transferred relevant intellectual property and user relationships to Slack.
- 2015
Screenhero acquisition
[1]Slack acquired Screenhero to strengthen voice, video, and screen-sharing capabilities.
- 2014
Company adopts the Slack Technologies name
[1]Tiny Speck renamed itself Slack Technologies as the collaboration product became its main business.
- 2013
Slack launches
[1]The company launched its internal communication technology as the commercial Slack collaboration platform.
- 2012
Glitch is closed
[1]Tiny Speck discontinued Glitch after determining that the game was not sustainable.
- 2011
Glitch enters public release
[1]Tiny Speck released Glitch, its social massively multiplayer online game.
- 2009
Tiny Speck is founded
[1]Stewart Butterfield founded Tiny Speck in Vancouver to develop a new social online game.
Products and positioning
Enterprise-oriented workplace collaboration centered on persistent, searchable conversations, software integrations, workflow automation, and connected team productivity.
Enterprise collaboration platform · 2013
Slack
Slack is a cloud-based workplace communication platform organized around channels, direct messages, searchable conversation histories, file sharing, notifications, and application integrations. It supports collaboration within teams and across organizations, with administrative, security, identity, workflow, and enterprise-management features for larger deployments. The platform evolved from an internal tool used during development of Glitch and became Slack Technologies’ principal commercial product. Following Salesforce’s acquisition, Slack continued as a distinct product and brand within Salesforce’s enterprise-software portfolio.
Online game · 2011
Glitch
Glitch was Tiny Speck’s original product, a stylized social massively multiplayer online game built around exploration, resource development, community, and player interaction. It launched publicly in 2011, was temporarily withdrawn for improvement, and was permanently closed in December 2012. Its development indirectly produced the internal communication system that later became Slack.
Controversies
2020
European antitrust complaint against Microsoft
Slack complained to the European Commission that Microsoft unlawfully bundled the competing Teams product with Microsoft’s office-software suite. The complaint framed Slack’s competitive concern around distribution leverage and the tying of collaboration software to a widely adopted productivity subscription.
2020
Investor securities litigation over the direct listing
Investors filed class-action litigation alleging that Slack’s direct-listing registration materials contained material misstatements or omissions. The dispute eventually reached the U.S. Supreme Court in Slack Technologies, LLC v. Pirani, which addressed whether a Securities Act plaintiff must trace purchased shares to the challenged registration statement.
Brand decisions
2020
Accept Salesforce acquisitionM&ABackground
Salesforce sought to strengthen its enterprise-software portfolio with a major collaboration and workplace communication platform.
Action taken
Salesforce announced an agreement to acquire Slack, which closed on July 21, 2021.
Aftermath
Slack was delisted and continued as a Salesforce-owned product and brand.
announced transaction value. $27.7 billion (December 2020 announcement)
2019
Use a direct listing rather than a conventional IPOStrategyBackground
Slack sought public-market access while allowing existing shareholders to sell shares directly on the exchange.
Action taken
Slack filed for and completed a direct listing on the New York Stock Exchange under ticker WORK.
Aftermath
Slack became a publicly traded company without using the standard underwritten IPO structure, until its acquisition by Salesforce.
2013
Redirect the company from Glitch to SlackProduct launchBackground
The company’s internal communication system had demonstrated more commercial potential than Glitch after the game was closed.
Action taken
Tiny Speck launched the communication tool as Slack and made it the company’s primary product.
Aftermath
Slack became the company’s core business and supported its subsequent financing, expansion, public listing, and acquisition.
Recent events
Adaptavist announces partnership with Slack[2]
Reported:
Adaptavist announced a partnership with Slack Technologies to offer services that create custom automations, build chatbots, and integrate Slack with other systems. The companies said a later phase would provide deeper out-of-the-box integration.
Sources2 sources
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