There have been quite a few of them. https://duckduckgo.com/?q=single+founder+y+combinator+companies https://duckduckgo.com/?q=single+founder+y+combinator+comp

There have been quite a few of them. https://duckduckgo.com/?q=single+founder+y+combinator+companies https://duckduckgo.com/?q=single+founder+y+combinator+compan... Again, it's definitely a strike against you in the selection process (as it probably should be...I've started a company solo and I've started a company with a co-founder...the latter is clearly better), but it's not a deal-breaker.