Rebel Fund, a venture capital firm based in San Francisco, focuses on investing in the best 0.1% of tech startups that apply to Y Combinator, the world's leading accelerator. With a team of accomplished Y Combinator alumni, Rebel Fund uses a proprietary machine-learning algorithm called Rebel Theorem to validate and screen potential investments. The fund typically invests in startups that are 2-3 years old and participates in rounds with 3-4 other investors. Its portfolio includes successful startups like EARTH AI, and it primarily invests in web development and real estate sectors.