Rebel Fund

Rebel Fund invests exclusively in seed-stage startups from Y Combinator, aiming to select roughly the top 10% of each batch. The firm builds a highly diversified portfolio, having backed over 250 YC companies since 2018, and uses a proprietary machine-learning algorithm called Rebel Theorem 4.0 to screen and validate potential investments before Demo Day.

The firm is led by Jared Heyman, Justin Hilliard, Luis Fortuño, and Alexandra Espinal, who are named as Rebel Leadership. They are supported by a group of investing partners who are accomplished Y Combinator alumni, including Steve Huffman of Reddit, Daniel Kan of Cruise, and Max Mullen of Instacart. The firm does not publicly delineate the precise investment committee structure.

Rebel Fund typically participates in seed rounds alongside other investors, leveraging its nearly 100% deal win rate on pre-Demo Day allocations from Y Combinator startups. The firm does not position itself as a lead investor and focuses on securing meaningful allocations in oversubscribed, high-quality YC rounds.

Deal flow is sourced directly from Y Combinator batches, where the firm's partners, themselves alumni, have what the firm describes as unique access. Rebel Thesis 4.0, the firm's machine-learning model, is trained on a proprietary database of YC startups and outcomes to identify the most promising companies before the official Demo Day.

Rebel Fund does not invest outside of Y Combinator. The firm's website explicitly states it only invests in YC-backed startups and will not respond to unsolicited investment offers from companies outside the accelerator program.

The firm publishes extensive data-driven analysis on the returns of a YC startup index, citing a 176% annualized return in one study, and discusses portfolio return profiles as 'top-decile.' However, Rebel Fund does not disclose its own current net IRR, TVPI, or DPI figures publicly.

There is no public disclosure of a separate philanthropic foundation or sidecar co-investment vehicle. The firm appears to operate a single core fund strategy that reinvests into the top segment of each YC batch, with LP engagement driven through an Annual General Meeting and exclusive events.