# Atmo funding: rounds and investors

> Atmo has raised $18M across 1 round since 2024. Investors include Y Combinator. Every round with its source.

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

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

# Who invested in *Atmo*

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.

AI

Y Combinator: W20

Funding summary Updated 26 Oct 2026

**$18M** raised across 1 round since 2024, from 1 source

- **Latest round:** Venture, $18M Dec 2024
- **Investors:** 1

See who backed them

## The rounds

- **Dec 2024** Venture **$18M** [Y Combinator](https://millionrounds.com/fund/y-combinator) Source recorded SEC filing: $18M sold, first sale Dec 2024

## 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=atmo).

## Also claim to have backed them

These 3 firms list Atmo 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.

[Signia Venture Partners](https://millionrounds.com/fund/signia-venture-partners) VC firm Per its own site

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

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

## Quick answers about Atmo

### Who invested in Atmo?

Atmo's investors include Y Combinator.

### How much has Atmo raised?

Atmo has raised $18M across 1 round since 2024.

### When did Atmo last raise?

Atmo's most recent round was a Venture of $18M in Dec 2024.

### What was Atmo's biggest round?

Its most recent round, $18M in Dec 2024, is also its largest on record.

### Who backed Atmo first?

Atmo's first round on record, in Dec 2024, was backed by Y Combinator.

### What stage is Atmo at?

Atmo's latest named round is a Venture, in Dec 2024.

### Where is Atmo based?

Atmo is based in the United States.

## Companies like Atmo

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

[**SpaceX** $42B · Oct 2026](https://millionrounds.com/company/spacex)[**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Albert Invent** $20M · Oct 2026](https://millionrounds.com/company/albert-invent)[**FORT Robotics** $39M · Oct 2026](https://millionrounds.com/company/fort-robotics)[**Pika** $216M · Oct 2026](https://millionrounds.com/company/pika)[**Vertical Semiconductor** $84M · Oct 2026](https://millionrounds.com/company/vertical-semiconductor)

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