We like companies with more than one founder.
Founding journeys are hard, long, and lonely, and they become much easier to navigate when you have a partner. Having founders who have complementary skill sets significantly increases the odds of success in your favor, especially if you are a first-time founder.
If you are a repeat founder, having co-founders may not be as critical though.
In short, there are exceptions to this rule, and we have backed a few single-founder startups in the past.