645 Ventures
Early-stage venture capital firm based in New York and San Francisco; new investor in Forterra's $238M Series C (Nov 2025).
645 Ventures is an early-stage venture capital firm investing at Seed and Series A (with some growth-stage participation) across enterprise software, deep tech, AI infrastructure, fintech, consumer, cybersecurity, and health tech, using a proprietary Voyager platform to support portfolio companies through scale.
Overview
- Firm
- 645 Ventures
- Headquarters
- New York, NY and San Francisco, CA
- Founded
- 0
- AUM
- $347M (Fund IV) + Select Fund, closed 2022
- Stages
- Seed, Series A, Growth
- Thesis
- Backs founders with purity of motivation, earned secrets, and non-consensus thinking — authentic problem-solving drive, unique market insight from domain expertise, obsessive focus, and contrarian perspectives ahead of consensus.
Portfolio companies1
Partners0
No linked records yet.
Frequently asked
- What is 645 Ventures?
- Backs founders with purity of motivation, earned secrets, and non-consensus thinking — authentic problem-solving drive, unique market insight from domain expertise, obsessive focus, and contrarian perspectives ahead of consensus.
- How much does 645 Ventures manage?
- 645 Ventures manages $347M (Fund IV) + Select Fund, closed 2022 in assets.
- What stages does 645 Ventures invest at?
- 645 Ventures invests at Seed, Series A, Growth.
Sources & citations3
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- 1
645 Ventures, a New York and San Francisco-based early-stage venture firm, invests at Seed and Series A (with growth-stage participation) across enterprise, deep tech, AI infrastructure, fintech, and cybersecurity.
645 Ventures: 645 Ventures — Early-Stage Venture CapitalVerified2026-08-08 - 2
645 Ventures is a new investor in Forterra's $238 million Series C.
GlobeNewswire: Forterra Closes $238 Million Series C, Cementing Leadership in Autonomy and Interoperable SystemsVerified2025-11-12 - 3
645 Ventures closed its fourth fund and first Select Fund at $347 million.
PR Newswire: 645 Ventures Closes $347M Fourth Fund and First Select Fund to Invest in Iconic Technology CompaniesVerified2022-01-01