Upstream

Stub active Updated Jun 8, 2026

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Location Paris, France
Latest Stage Pre-seed
Total Raised $3M
Website https://upstream.so/
Sector
ai productivity email collaboration agentic-ai

Investors

Xavier Niel pre-seed (2026)
Michael Shaulov 2022 (2022)
Y Combinator pre-seed (2026)
Kima Ventures pre-seed (2026)
cyberstarts 2022 (2022)

Founders

Louis Lecat CEO & Co-Founder

About

Upstream is a Paris-based startup building an AI-native email inbox designed for collaboration between humans and AI agents 1. Co-founded by Louis Lecat (CEO), the company is rebuilding email infrastructure so AI agents can read, write, organize, and act on behalf of users — handling AI-powered prioritization, automated drafting in the user’s writing style, meeting scheduling, information retrieval, and team collaboration around email threads 1.

Funding History

Date Round Amount Lead Co-investors
2026-06-03 Pre-seed $3M Y Combinator Connect Ventures, Roosh Ventures, Kima Ventures (Xavier Niel), Koen Bok, Jorn van Dijk, Nicolas Dessaigne, Julien Lemoine, Linda Tong, Jean-Charles Samuelian, Charles Gorintin 1

What Investors Say

No independently sourced investor quotes available at this time.

What Founders Say

“Email remains one of the most deeply embedded communication systems in work.” — Louis Lecat, CEO & Co-Founder 1

Sources

  1. Tech.eu, “Upstream raises $3M to launch collaborative AI inbox backed by YC and Xavier Niel,” June 3, 2026. https://tech.eu/2026/06/03/upstream-raises-3m-to-launch-collaborative-ai-inbox-backed-by-yc-and-xavier-niel/↩↩↩↩