# Altaeros Energies funding: rounds and investors

> Altaeros Energies has raised $42M across 2 rounds since 2014. Investors include National Science Foundation, MassChallenge and SoftBank.

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

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

# Who invested in *Altaeros Energies*

2 rounds we have observed, with the 4 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Cleantech

Funding summary Updated 26 Oct 2026

**$42M** raised across 2 rounds since 2014, from 2 sources

**$7.0M** Venture **$35M** Venture

- **Latest round:** Venture, $35M Jul 2022
- **Step-up i:** 5×
- **Investors:** 4

See who backed them

## The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2016 2018 2020 2022

**$7.0M** Venture

**$35M** Venture

- **First round:** Venture, $7.0M
- **Biggest round:** $35M
- **Between rounds:** 7.6 years

## The rounds

- **Jul 2022** Venture **$35M** *3 new* [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [MassChallenge](https://millionrounds.com/fund/masschallenge) [SoftBank](https://millionrounds.com/fund/softbank-2) Source recorded SEC filing: $35M sold, first sale Jun 2022
- **Dec 2014** Venture **$7.0M** *1 new* [SoftBank Capital](https://millionrounds.com/fund/softbank-capital-2) From a historical funding record SEC filing: $7.2M sold, first sale Nov 2014

## Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

**Venture** 2014 **Venture** 2022 [National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) [MassChallenge](https://millionrounds.com/fund/masschallenge) [SoftBank](https://millionrounds.com/fund/softbank-2) [SoftBank Capital](https://millionrounds.com/fund/softbank-capital-2)

## Everyone who backed them

[National Science Foundation](https://millionrounds.com/fund/nsf-small-business-innovation-research-small-business-techno) Government **1** round

[MassChallenge](https://millionrounds.com/fund/masschallenge) Accelerator **1** round

[SoftBank](https://millionrounds.com/fund/softbank-2) Investment firm **1** round

[SoftBank Capital](https://millionrounds.com/fund/softbank-capital-2) VC firm **1** round

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

## Also claim to have backed them

This firm lists Altaeros Energies as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above.

[MIT Alumni Angels of NorCal](https://millionrounds.com/fund/mit-alumni-angels-of-norcal) Angel network Per its own site

## Quick answers about Altaeros Energies

### Who invested in Altaeros Energies?

Altaeros Energies's investors include National Science Foundation, MassChallenge, SoftBank and SoftBank Capital.

### How much has Altaeros Energies raised?

Altaeros Energies has raised $42M across 2 rounds since 2014.

### When did Altaeros Energies last raise?

Altaeros Energies's most recent round was a Venture of $35M in Jul 2022.

### What was Altaeros Energies's biggest round?

Its most recent round, $35M in Jul 2022, is also its largest on record.

### Who backed Altaeros Energies first?

Altaeros Energies's first round on record, in Dec 2014, was backed by SoftBank Capital.

### What stage is Altaeros Energies at?

Altaeros Energies's latest named round is a Venture, in Jul 2022.

### Where is Altaeros Energies based?

Altaeros Energies is based in the United States.

## Companies like Altaeros Energies

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

[**Amogy** $125M · Oct 2026](https://millionrounds.com/company/amogy)[**LanzaJet** $67M · Oct 2026](https://millionrounds.com/company/lanzajet)[**Pivot Energy** $500M · Oct 2026](https://millionrounds.com/company/pivot-energy)[**Peak Energy** $163M · Oct 2026](https://millionrounds.com/company/peak-energy)[**Renew** $207M · Oct 2026](https://millionrounds.com/company/renew)[**Optivolt** $37M · Oct 2026](https://millionrounds.com/company/optivolt)

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