A TechCrunch article published in 2016 argued that startups that have more than one founder aren’t necessarily more successful. The author pointed out that at the time of writing, 52.3% of startups that exited (were acquired or IPO’d) had only one founder. This analysis flew in the face of conventional wisdom: that teams needed two or three co-founders to make it. While I don’t dispute the findings, I do think that summary statistics miss a number of nuances that are critical when deciding whether or not to bring on a co-founder. In this article, we’ll dive deeper into the dynamics that are likely to drive this decision.