United States · 
Who invested in Estuary?
Estuary's investors include M13, Gaingels, FirstMark, Flex Capital and Operator Partners. M13 led its latest round.
United States · Series A startup
Who invested in Estuary
One round we have observed, with the 5 investors named in it. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
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Funding summaryUpdated 5 Nov 2026
$17Mraised across 1 round since 2025, from 1 source
- Latest round
- Series A, $17MOct 2025
- Led by
- M13
- Investors
- 5 (1 led)
The rounds
- Oct 2025
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 4 firms list Estuary as a portfolio company on their own websites, but no report of a round names them. They are the firms' own claims, kept apart from the rounds above.
Quick answers about Estuary
How much has Estuary raised?
Estuary has raised $17M across 1 round since 2025.
When did Estuary last raise?
Estuary's most recent round was a Series A of $17M in Oct 2025, led by M13.
What was Estuary's biggest round?
Its most recent round, $17M in Oct 2025, is also its largest on record.
Who backed Estuary first?
Estuary's first round on record, in Oct 2025, was backed by M13, Gaingels and FirstMark and 2 others.
What stage is Estuary at?
Estuary's latest named round is a Series A, in Oct 2025.
Where is Estuary based?
Estuary is based in the United States.
Who led Estuary's rounds?
M13 led the Series A in 2025.
Companies like Estuary
In the same sector, and raised in the last eighteen months.
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