This open source messaging startup raised $50 million to take on Slack and Microsoft Teams and rope in customers who care a lot about privacy

Business Insider - June 19, 2019

“Mattermost, a messaging app designed for businesses with serious privacy and security needs, announced a $50 million funding round on Wednesday, roughly four months after scooping up its first, Series A round of funding.”

Mattermost raises $50 million to advance its open source Slack alternative

VentureBeat - June 19, 2019

“CEO Ian Tien says the series B proceeds will accelerate Mattermost’s community expansion and product development and fuel expansion of its workforce from 65 employees to 110 by 2020.”

Y Combinator leads $50M round into open-source Slack rival Mattermost

siliconAngle - June 19, 2019

“Mattermost provides an open-source messaging platform built to run on companies’ internal infrastructure. The service can be deployed in a public cloud such as Amazon Web Services or on on-premises hardware, behind the corporate firewall. That allows organizations to retain full control of employee communications and shield chat messages from prying eyes with the help of the existing security systems protecting their infrastructure.”

Open-source chat plat toasts rival after picking up $50m in funding: 'The better Slack does, the better Mattermost does'

The Register - June 19, 2019

“Investor enthusiasm for all things messaging does not appear to be waning as CEO Ian Tien rolled his wheelbarrow of cash away from the offices of Y Combinator Continuity (YC), who led the $50m Series B investment.”