Rebel Fund is a venture capital firm focused on investing in top-tier Y Combinator startups, typically at seed stage, with a strong emphasis on pre-Demo Day opportunities. The team comprises accomplished YC alumni who have co-founded companies valued in the tens of billions and have backed more than 250 startups. The fund uses a proprietary machine-learning model called Rebel Theorem 4.0 to screen and validate potential investments, aiming to build a diversified portfolio of YC-backed startups that outperform. Rebel highlights its access to YC companies, unicorn outcomes, and a track record of high portfolio returns across technology sectors.