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Upstream
YC S23Paris, FR · Founded 2023 · 7 employees · 15 known investors
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Upstream is a team communication and collaboration platform designed to help professionals manage messages, tasks, and decision-making workflows across their organization.
Also known as Upstream Labs, Inc. · Snik
Founders & leadership· Y Combinator alumni (S23)
Upstream was founded in 2023 by Louis Lecat and Jonathan Tiret.
Investors · 15
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Motier Ventures's portfolio page · Y Combinator's founder network · Not right? Tell us
How we know: Roosh Ventures's portfolio page · tech.eu · Y Combinator's founder network · Not right? Tell us
How we know: the Y Combinator directory · funding news · startup-in-europe.com · open dataset · 5k.vc investor directory · Not right? Tell us
How we know: open dataset · 5k.vc investor directory · Not right? Tell us
How we know: open dataset · 5k.vc investor directory · Not right? Tell us
How we know: open dataset · 5k.vc investor directory · Not right? Tell us
How we know: funding news · Y Combinator's founder network · Not right? Tell us
How we know: open dataset · investor-profiles · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
How we know: Y Combinator's founder network · Not right? Tell us
Funding
SEC filings, press & company announcements$3M disclosed across 1 of 2 rounds · 2026
- $3MPre-seedJun 2026 · 3 sources
Y Combinator (lead), Connect Ventures, Roosh Ventures
Source ↗
Source: company announcements and press reports — follow each round's link for the claim.
Legal entities · 1
corporate structureIn the news
Frequently asked questions
- What does Upstream do?
- Upstream is a team communication and collaboration platform designed to help professionals manage messages, tasks, and decision-making workflows across their organization.
- Who founded Upstream?
- Upstream was founded by Louis Lecat, Jonathan Tiret in 2023.
- Who are Upstream's investors?
- Upstream's investors include Connect Ventures, Kima Ventures, Motier Ventures, Roosh Ventures, Y Combinator, BIP Ventures, Bloomberg Beta, Blumberg Capital and 7 more.
- How much funding has Upstream raised?
- Upstream has disclosed $3M raised across 1 of its 2 known rounds.
- Where is Upstream headquartered?
- Upstream is headquartered in Paris, FR.