Rebel Fund

Rebel Fund, established in 2019 and headquartered in San Francisco, California, is a venture capital firm specializing in seed-stage investments. It focuses on technology startups, primarily in the United States, with a particular interest in education, training services, information technology, and healthcare sectors. The firm leverages a network of Y Combinator alumni and a proprietary machine learning algorithm to predict startup success and inform investment decisions.

John Adler III

Partner

Jared Heyman

Managing Partner

Steve Huffman

Partner

Daniel Kan

Partner

Richard Sussman

Co-Founder and Strategic Partner

Past deals in Simulation

Dalus

Seed Round in 2025
Dalus is a technology company specializing in software for systems engineering. It leverages artificial intelligence to model and assess intricate systems, catering primarily to industries such as robotics, aerospace, and defense that require mission-critical solutions. The company's core product is a model-based systems engineering software, which facilitates system modeling, version control, and system-level simulation. This tool is designed to streamline the integration of new team members into the modeling process, thereby enhancing overall efficiency and collaboration within engineering teams.

Symphony

Pre Seed Round in 2024
Symphony trains employees using AI voice simulations of real-world scenarios to help them practice and improve performance.

Hyperbound

Seed Round in 2023
Hyperbound is a technology company that specializes in AI-driven sales enablement. Its primary product is a simulated AI Sales Roleplay platform, which transforms Ideal Customer Profile (ICP) descriptions into interactive AI buyers within two minutes. This platform helps sales teams accelerate onboarding by 50% and enhances conversion rates across cold, warm, and discovery calls. Unlike traditional roleplay methods, Hyperbound's solution provides realistic, unbiased practice scenarios without risking pipeline leads or consuming managerial time. The company also offers an AI-based sales email software that leverages public internet data sources to generate personalized emails at scale, maintaining brand reputation and identity.
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