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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

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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.

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Sources & citations3

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