# Estuary funding: rounds and investors

> Estuary has raised $17M across 1 round since 2025. Investors include M13, Gaingels and FirstMark. Every round with its source.

Source: https://millionrounds.com/company/estuary (Millionrounds; every figure on the page links to its filing or article)

United States · [Series A startup](https://millionrounds.com/companies)

# 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.

Data Infrastructure

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Funding summary Updated 5 Nov 2026

**$17M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series A, $17M Oct 2025
- **Led by:** M13
- **Investors:** 5 (1 led)

See who backed them

## The rounds

- **Oct 2025** Series A **$17M** [M13](https://millionrounds.com/fund/m13) Lead [Gaingels](https://millionrounds.com/fund/gaingels) [FirstMark](https://millionrounds.com/fund/firstmark) [Flex Capital](https://millionrounds.com/fund/flex-capital) [Operator Partners](https://millionrounds.com/fund/operator-partners) Reported by AlleyWatch

## Everyone who backed them

[M13](https://millionrounds.com/fund/m13) VC firm **1** round, led 1

[Gaingels](https://millionrounds.com/fund/gaingels) Private equity **1** round

[FirstMark](https://millionrounds.com/fund/firstmark) VC firm **1** round

[Flex Capital](https://millionrounds.com/fund/flex-capital) VC firm **1** round

[Operator Partners](https://millionrounds.com/fund/operator-partners) VC firm **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=estuary).

## 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.

[Swift Ventures](https://millionrounds.com/fund/swift-ventures) VC firm Per its own site

[Breakpoint Capital](https://millionrounds.com/fund/breakpoint-capital) Private equity Per its own site

[Eudemian Ventures](https://millionrounds.com/fund/eudemian-ventures) VC firm Per its own site

[Whoa Ventures](https://millionrounds.com/fund/whoa-ventures) VC firm Per its own site

## Quick answers about Estuary

### Who invested in Estuary?

Estuary's investors include M13, Gaingels, FirstMark, Flex Capital and Operator Partners. M13 led its latest round.

### 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.

[**Journify** $12M · Nov 2026](https://millionrounds.com/company/journify)[**Fragment** $78M · Oct 2026](https://millionrounds.com/company/fragment)[**Supabase** $950M · Oct 2026](https://millionrounds.com/company/supabase)[**Feldera** $22M · Sept 2026](https://millionrounds.com/company/feldera)[**Euno** $23M · Sept 2026](https://millionrounds.com/company/euno)[**Snorkel AI** $350M · Sept 2026](https://millionrounds.com/company/snorkel-ai)

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