645 Ventures
645 Ventures invests in early-stage startups & helps them become growth-stage businesses.
Investing activity
645 Ventures appears in 10 AI deals tracked by the Lounge deals desk, rounds totalling $52M, and led 2 of them. The rounds are mostly Seed, with a median round size of $6M and the largest at $52M. The most recent are Lightsprint (Seed, $6.1M, Oct 2026), Pelgo (Seed, $5.5M, Aug 2026) and Rivo (Seed, $2.7M, Aug 2026).
645 Ventures most often invests alongside Y Combinator, Kindred Ventures, Seven Stars Ventures and Databricks Ventures, and the companies it backs on Lounge are mostly in AI.
Deals
Frequently asked questions about 645 Ventures
What AI companies has 645 Ventures invested in?
645 Ventures's AI investments include Lightsprint, Pelgo, Rivo, Ellis, Fish Audio, Pomo, General Analysis and Arbor. The 10 rounds on Lounge are listed on this page with amounts, dates and co-investors.
Where is 645 Ventures based?
645 Ventures is based in New York City, New York, United States.
What stage does 645 Ventures invest at?
In the rounds tracked on Lounge, 645 Ventures has invested at Seed, with a median round of $6M. 645 Ventures led 2 of those rounds.
Who does 645 Ventures co-invest with?
645 Ventures's most frequent co-investors on Lounge are Y Combinator (3 deals), Kindred Ventures (2 deals), Seven Stars Ventures (2 deals), Databricks Ventures (2 deals) and SV Angel (2 deals).
How can founders reach 645 Ventures?
Founders on Lounge can see 645 Ventures's contact details in AI Investor Contacts (paid plans), check for a warm introduction through members who worked with the firm under Warm Paths, and add 645 Ventures to their Investor Pipeline to track the conversation.