General Info
Geoff Ralston is a Partner at Y Combinator and the Co-Founder of Imagine K12. His investment thesis focuses on High Tech, Consumer, and other sectors. Geoff Ralston typically invests in startups at the seed stage. He prefers geographical investments in the United States. Some of his notable previous investments include Mailgun, Hatch, and Triplebyte. Geoff Ralston’s track record includes roles at top companies such as Yahoo!, Lala Media, and Imagine K12. When investing, Geoff Ralston follows a standard deal offering $500,000, with an additional $375,000 investment on an uncapped safe. His partnership and collaboration styles involve actively supporting startups and bringing valuable experience to the table.
Location: San Francisco, CA
Country: United States of America
Industries:
Investment Regions:
Investment Stages: pre-seed, seed
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🤖 AI Activity Report
Status: very-active
AI Reasoning: Crunchbase shows Geoff Ralston’s most recent personal investment was in Rain Industries with a funding round dated Sep 21, 2023. Calculating difference from Nov 1, 2025, that is 2 years and ~1 month – which would normally classify as low-active. However, multiple sources indicate more recent investor activity: PitchBook references a deal on Jan 1, 2025 and other mentions in 2025 indicate activity (e.g., social posts April 2025). The most reliable consistent source (PitchBook) lists a 2025 investment, placing the last investment within 6 months of Nov 1, 2025, so tag as very-active.
Angel activity thresholds:
Low Activity – Only known angel investments more than 12 months ago.
Active – Known angel investments between the last 12 and 6 months.
Very Active – Known angel investments in the last 6 months.
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