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  4. /Pioneer Fund
PF

Pioneer Fund

GeneralistSan Francisco, United StatesActiveWebsiteLinkedIn
Stage FocusPre-Seed, Seed, Series A
GeographyGlobal
TypeAngel Network
Last Activity2026
Industry Focus
Industries
AIBiotech
Investor TypeGeneralist
ExposureMinimal DeepTech Investments
Bio

Pioneer Fund is a San Francisco-based investment vehicle made up of more than 540 Y Combinator alumni, pooling capital to invest in and support startups coming out of Y Combinator's accelerator batches. It is led by founder and managing general partner Jason Gray alongside managing general partner Tim Suzman, with dedicated general partners covering AI and bio/health. Y Combinator president and CE...

Notable Investments
A
Anthropic
C
C16 Biosciences
P
PostEra
R
REGENT
V
Vanta
R
Recall.ai
B
Bland AI
B
Browser Use
M
Mastra
B
Breadfast
A
Aspire
K
Kapital

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