# Stack Auth funding: rounds and investors

> Stack Auth has raised $500K across 1 round since 2024. Investors include Y Combinator. Every round with its source.

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

United States · [Pre-seed startup](https://millionrounds.com/companies)

# Who invested in *Stack Auth*

One round we have observed, with the one investor 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.

IT Services

Funding summary Updated 26 Oct 2026

**$500K** raised across 1 round since 2024, from 1 source

- **Latest round:** Pre-seed, $500K Sept 2024
- **Investors:** 1

See who backed them

## The rounds

- **Sept 2024** Pre-seed **$500K** [Y Combinator](https://millionrounds.com/fund/y-combinator) Source recorded

## Everyone who backed them

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

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

## Quick answers about Stack Auth

### Who invested in Stack Auth?

Stack Auth's investors include Y Combinator.

### How much has Stack Auth raised?

Stack Auth has raised $500K across 1 round since 2024.

### When did Stack Auth last raise?

Stack Auth's most recent round was a Pre-seed of $500K in Sept 2024.

### What was Stack Auth's biggest round?

Its most recent round, $500K in Sept 2024, is also its largest on record.

### Who backed Stack Auth first?

Stack Auth's first round on record, in Sept 2024, was backed by Y Combinator.

### What stage is Stack Auth at?

Stack Auth's latest named round is a Pre-seed, in Sept 2024.

### Where is Stack Auth based?

Stack Auth is based in the United States.

## Companies like Stack Auth

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

[**Chariot Claims** $23M · Oct 2026](https://millionrounds.com/company/chariot-claims)[**Subeca** $9.0M · Oct 2026](https://millionrounds.com/company/subeca)[**FlexCompute** $53M · Oct 2026](https://millionrounds.com/company/flexcompute)[**Negosh** $3.1M · Oct 2026](https://millionrounds.com/company/negosh)[**StarLifter** $4.0M · Oct 2026](https://millionrounds.com/company/starlifter)[**Litewave.AI** $1.7M · Oct 2026](https://millionrounds.com/company/litewave-ai)

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