← Embedded Finance Index 2026

Slack

“Can Slack transform from a standalone messaging platform into the AI-powered conversational operating layer for all of Salesforce's enterprise software?”

Founded2009
HQSan Francisco, CA, USA
FoundersStewart Butterfield
Total raised$340M+
Latest roundDirect Listing (NYSE: WORK), June 2019
Valuation$27.1B (Salesforce acquisition, 2021)
IndustryHorizontal SaaS / Collaboration & Communication
The story

Founded in 2009 as Tiny Speck to build a massively multiplayer online game (Glitch), the team's internal communication tooling proved more valuable than the game itself. After Glitch was shut down in 2012, the founders pivoted to launch Slack in 2013 as a standalone enterprise messaging platform. Slack grew explosively through product-led growth, going public via direct listing in 2019, before being acquired by Salesforce in 2021 for $27.1B — embedding it into the broader Salesforce ecosystem. Post-acquisition, Slack has become Salesforce's collaboration layer and a distribution channel for Salesforce AI products including Agentforce.

Last 12 months
2026-02
Product timeline
2009
Founded as Tiny Speck, initially building the online game Glitch.· pivot
2013
Launched Slack as an internal team communication tool spun out of Tiny Speck's game development workflow.· pivot
2014
Reached unicorn status ($1.12B valuation) after $120M raise led by Kleiner Perkins and Google Ventures.· funding
2019
Completed a direct listing on the NYSE under ticker WORK, with a reference price of $26/share valuing it at ~$15.7B.· ipo
2021
Acquired by Salesforce for $27.1B, becoming a core pillar of the Salesforce Customer 360 platform.· acquisition
2023
Launched Slack AI with summarization and search features; subprocessor list migrated under Salesforce infrastructure umbrella.· banking
The stack
1 layer disclosed in Slack’s embedded-finance stack
Payments / PSP
Stripe
Accounting gap: none