Sum Ventures, based in California, backs Pre-Seed and Seed startups in fintech, proptech, healthtech, and climate, often leading investments.
3 people on the investing team, 3 of them partners who can make the call. Partners are listed first.


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Raising a pre-seed or seed round? We write $1M to $5M first checks and help founders with distribution. A partner reads every deck.
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Sum Ventures reports entry at pre-seed, seed.
Sum Ventures has not reported a check size.
Sum Ventures has not reported a lead preference.
Elizabeth Spears (General Partner), Brent Celek (Partner), Raj Khoshoo (Senior Partner).
No recent activity since September 2026.
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