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Pioneer Fund is a fund of 300+ Y Combinator alumni investing in the top companies of YC and our Venture Partner network. We are a fund of 300+ Y Combinator alumni working together to invest in top Y Combinator startups. Our portfolio has gone on to raise from Andreessen Horowitz, Accel, Sequoia, Khosla, Lux, First Round, Initialized, Founders Fund, and many other top VCs.