# StackOne funding: rounds and investors

> StackOne has raised $20M across 1 round since 2025. Investors include Sequoia Capital, Episode 1 and Portfolio Ventures. Every round with its source.

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

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

# Who invested in *StackOne*

One round we have observed, with the 4 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.

Big Data & Analytics

Funding summary Updated 26 Oct 2026

**$20M** raised across 1 round since 2025, from 1 source

- **Latest round:** Series A, $20M May 2025
- **Investors:** 4

See who backed them

## The rounds

- **May 2025** Series A **$20M** [Sequoia Capital](https://millionrounds.com/fund/sequoia-capital) [Episode 1](https://millionrounds.com/fund/episode-1) [Portfolio Ventures](https://millionrounds.com/fund/will-martin) [XTX Ventures](https://millionrounds.com/fund/xtx-ventures) Source recorded

## Founders and team

From StackOne's own website: 2 founders.

**Romain Sestier** Co-Founder & CEO

**Guillaume Lebedel** Co-Founder & CTO

## Everyone who backed them

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

[Episode 1](https://millionrounds.com/fund/episode-1) VC firm **1** round

[Portfolio Ventures](https://millionrounds.com/fund/will-martin) VC firm **1** round

[XTX Ventures](https://millionrounds.com/fund/xtx-ventures) Company **1** round

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

## Also claim to have backed them

These 3 firms list StackOne 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.

[PWV](https://millionrounds.com/fund/pwv) VC firm Per its own site

[Revenue Syndicate](https://millionrounds.com/fund/revenue-syndicate) Angel network Per its own site

[Thunder Future](https://millionrounds.com/fund/thunder-future) Family office Per its own site

## Quick answers about StackOne

### Who invested in StackOne?

StackOne's investors include Sequoia Capital, Episode 1, Portfolio Ventures and XTX Ventures.

### How much has StackOne raised?

StackOne has raised $20M across 1 round since 2025.

### When did StackOne last raise?

StackOne's most recent round was a Series A of $20M in May 2025.

### What was StackOne's biggest round?

Its most recent round, $20M in May 2025, is also its largest on record.

### Who backed StackOne first?

StackOne's first round on record, in May 2025, was backed by Sequoia Capital, Episode 1 and Portfolio Ventures and 1 others.

### What stage is StackOne at?

StackOne's latest named round is a Series A, in May 2025.

### Where is StackOne based?

StackOne is based in the United Kingdom.

## Companies like StackOne

In the same sector, and raised in the last eighteen months.

[**Cognitive Credit** $64M · Oct 2026](https://millionrounds.com/company/cognitive-credit)[**Salience Labs** $169M · Oct 2026](https://millionrounds.com/company/salience-labs)[**Affinity Labs** $3.2M · Oct 2026](https://millionrounds.com/company/affinity-labs)[**Alchera Technologies** $3.7M · Oct 2026](https://millionrounds.com/company/alchera-technologies)[**Foundational** $19M · Oct 2026](https://millionrounds.com/company/foundational)[**Quartz** $3.7M · Sept 2026](https://millionrounds.com/company/quartz)

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