# Muon Space raises $250M Series C led by Eclipse Capital

> Muon Space, based in United States, has raised $250M in a Series C led by Eclipse Capital, announced on 20 August 2026. 4 other investors joined.

Source: https://millionrounds.com/news/rounds/muon-space-series-c-2026-08 (Millionrounds; every figure on the page links to its filing or article)

Raised **$250M** 2 sources reported it

Stage **Series C** first round on record

Investors **5** 1 named as lead

Where **US** United States

Aerospace & Space Climate Tech Defence Tech

## How big is it?

Against every equity round we recorded in the twelve months to 20 August 2026. Ranks count companies, so the same raise reported twice is counted once.

**#200** equity round of the last twelve months

**#35** Series C of 194 in that time

**#140** round in United States, of 1,100

This round **$250M**

Median Series C **$100M**

2.5 times the median Series C of the last twelve months.

## Who invested

- [**Eclipse Capital** 1 round in the last twelve months *Led*](https://millionrounds.com/fund/eclipse-capital)

Also in the round

- [Salesforce Ventures](https://millionrounds.com/fund/salesforce-ventures)
- [Wellington Management](https://millionrounds.com/fund/wellington-management)
- [Google](https://millionrounds.com/fund/google-assistant-investments)
- [Galvanize](https://millionrounds.com/fund/galvanize)

## Funding history

- August 2026 Series C **$250M**

This is the first round we hold for the company.

## Reported by

- TechStartups 20 August
- Ventureburn 20 August

The round's figures come from these reports; each link opens the original.

## Other big rounds that week

[**Starcloud** $250M Series A](https://millionrounds.com/news/rounds/starcloud-series-a-2026-08)[**Castelion** $800M Series C](https://millionrounds.com/news/rounds/castelion-series-c-2026-08)[**Callosum** $100M Seed](https://millionrounds.com/news/rounds/callosum-seed-round-2026-08)[**Groq** $350M Series A](https://millionrounds.com/news/rounds/groq-series-a-2026-08)[**Also** $150M Series D](https://millionrounds.com/news/rounds/also-series-d-2026-08)[W **Wispr** $280M Series B](https://millionrounds.com/news/rounds/wispr-series-b-2026-08)

[The company **Muon Space on Millionrounds** *→*](https://millionrounds.com/company/muon-space)[Weekly roundup **Week of 17 August** *→*](https://millionrounds.com/news/weekly/2026-08-17)[Monthly roundup **August 2026** *→*](https://millionrounds.com/news/monthly/2026-08)

**How this article is made**

We write one for every equity round of $100M or more that at least two sources reported. It is put together from our record of rounds, not rewritten from the reports: the ranks and medians count every equity round we read in the twelve months to the round's date. [How we read rounds](https://millionrounds.com/methodology) · [Report a mistake](https://millionrounds.com/corrections)