Pioneer Fund is a venture capital firm that invests in early-stage startups building frontier technology hardware and software for the physical world. They focus on sectors including robotics, autonomous systems, defense, aerospace, energy, climate technologies, advanced manufacturing, and materials science. The firm backs founders developing solutions for real-world applications in industrials and compute infrastructure. Their portfolio includes companies such as Hadrian, Apex, and others sourced from their investments list. Pioneer Fund collaborates with co-investors and maintains a team of general partners with venture and operational experience. The fund is based in San Francisco and was founded in 2023.