Sources: Slack is raising about $400M or more led by General Atlantic at a post-money valuation of at least $7B
Slack — the app that lets coworkers and others in professional circles chat with each other and call in data from hundreds of integrated apps in the name of getting more work done …
Context & Ripple Effects
This report lands mid-trajectory in Slack's funding arc: talks at a $2B-plus value in early 2015, a $200M round at $3.8B with 800K paid users in April 2016, then a SoftBank- and Accel-led $250M round above $5B in July 2017. The current raise pushes the post-money past $7B — roughly doubling the 2016 mark in two years.
The lead investor also signals a shift in who is underwriting that climb: General Atlantic, a growth-stage firm, rather than the earlier venture syndicate. The raise was subsequently confirmed as a $427M Series H led by Dragoneer and General Atlantic at over $7.1B.
First-order effects
- Slack banks roughly $400M or more of new capital at a post-money of at least $7B, giving it a substantially larger balance sheet while still private.
- General Atlantic takes the lead position, marking the entry of a growth-equity firm into what had been a venture-led cap table.
Second-order effects
- Earlier backers such as SoftBank and Accel see their positions marked up from the $5B-plus 2017 round toward $7B-plus, strengthening the case for holding rather than exiting.
- A raise this size at this stage raises the bar for any rival workplace-chat product seeking comparable late-stage capital on similar terms.
Third-order effects
- If the pattern holds — $2B in 2015, $3.8B in 2016, $5B in 2017, $7B-plus now — Slack is being capitalized for scale on private-market money, with the eventual public listing as the structural endpoint.
- The migration of lead roles from venture firms to growth investors points to late-stage enterprise software rounds increasingly funded by crossover capital ahead of IPOs.
The trend: Enterprise collaboration companies are raising progressively larger late-stage rounds from growth and crossover investors, extending their private runway ahead of a public offering.