Upstream

Upstream is a collaborative email client with channels and task-tracking, offering context and transparency for efficient team decisions.

Y Combinator

Latest funding

$3M Pre Seed · June 3, 2026

Total raised: $3.5M* across 2 sourced rounds

Website: upstream.do.

X: @upstream_do · 67 followers.

LinkedIn: upstreamdo.

Sectors: B2B, Productivity.

Stage: Pre Seed.

Based in: Paris, France.

Total raised: $3.5M* in 2 sourced rounds.

Last round: Jun 3, 2026 · 162 days ago.

Team: 7 people on the team page.

On Recent Funding since: Sep 28, 2026.

Signals

X account@upstream_do · created Jul 26, 2023 (3 years old) · 67 followers

Website registeredJun 16, 2023 (3 years old)

TIMELINE · MONEY RAISED

@upstream_do·Raised $3.0M in 1 sourced round·2 signals before the first raise

Money raised, round by round (amounts linked to their source). Pins are dated signals; hover the icons for dates.

Sources and API

Every amount links to the page it came from. * Estimated from an accelerator's published standard deal, not a company-specific disclosure. How Recent Funding sources and verifies funding data. The same data as JSON: /api/v1/companies/upstream (get a free API key).