Stewart Butterfield is a Canadian entrepreneur and angel investor best known as the co-founder and former CEO of Slack. See portfolio and contact routes.
Stewart Butterfield is a Canadian entrepreneur and angel investor best known as the co-founder and former CEO of Slack, with a background that includes creating Flickr and holding advanced degrees in philosophy from Cambridge University[5][8]. His investment thesis concentrates on early-stage companies in collaboration tools, developer infrastructure, and workplace technology, reflecting his own expertise in how teams communicate[1][2]. He typically invests as an angel or through small syndicates, favoring founders with strong product quality and those who have learned from prior failures[1]. Notable portfolio companies include Netlify, Carta, and Viktor, an enterprise AI firm where he holds a significant Series A exposure[2][7]. Butterfield does not seek to build a personal investor brand, instead quietly backing founders who demonstrate genuine pattern recognition in their domains[1]. His distinctive point of view emphasizes that distribution is as critical as product and that second-time founders often outperform first-timers due to their resilience[1].
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