| Founded | 2015 |
|---|---|
| Closed | 2024 |
| Country | USA |
| Sector | Saas |
| Total raised | 165 |
| Collapse type | Market Exit |
| Founder | Ian Tien |
Mattermost
"The open-source Slack alternative — caught between Microsoft Teams free and Slack's mindshare."
Key Events Timeline
Mattermost built an open-source, self-hostable messaging platform — positioning itself as the security-conscious enterprise alternative to Slack, particularly attractive to government, defense, and regulated industries that couldn't use cloud-hosted platforms.
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