Katie Henderson
Slack: $3.8 billion
Slack was originally founded as Tiny Speck, a gaming company, in 2009. After the game flopped, founder Stewart Butterfiled realized that the messaging app they had built internally could be a big business. Slack brings all your communication together in one place. It’s real-time messaging, archiving and search for modern teams.
Zenefits: $4.5 billion
Zenefits is free online HR Software that gives your team a single place to manage all your human resource needs such as payroll, benefits and compliance. Founded in 2012, Zenefits has raised almost $600 million in venture capital, bringing the value to $4.5 billion. Despite the companies rapid increase, they have recently hit a bump in the road with a CEO change, investigations into business practices and layoffs.
