United States · 
Who invested in Muon Space?
Muon Space's investors include Eclipse Capital, Salesforce Ventures, Wellington Management, Costanoa Ventures and Google, and 6 more on record. Eclipse Capital led its latest round.
2026
$45MGrant$250MSeries C
United States · Series C startup
Who invested in Muon Space
2 rounds we have observed, with the 11 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.
Raised 3 months ago
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Funding summaryUpdated 5 Nov 2026
$295Mraised across 2 rounds since 2025, from 3 sources
$45MGrant$250MSeries C
- Latest round
- Series C, $250MAug 2026
- Led by
- Eclipse Capital
- Step-upi
- 5.6×
- Investors
- 11 (1 led)
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Grant, $45M Oct 2025
- Biggest round
- $250M Series C · Aug 2026
- Between rounds
- 11 months from the last two
The rounds
- Aug 2026Series C$250M5 new
Reported by TechStartups and 1 other
- Oct 2025Grant$45M6 new
Source recorded
Funding filed with regulators
Muon Space filed one raise, $25M in all. Filings say how much was sold and to how many investors; they never name the investors.
- May 2022$25MSEC Form D
Founders and team
From Muon Space's own website and the SEC filings it signed: 4 founders, 10 on the team.
- Gregory SmirinPresident
- Ryan GrayChief Financial Officer
- Shirley PaleyChief Legal Officer
- Gautier BrunetVP Product
- Jeremy PackVP Engineering
- John TeterVP Operations
- Melissa LawrenceVP People Operations
- Jonathan NutzmannSenior Director of Hardware
- Daniel McCleeseExecutive Officer, Directori
- Jonathan DyerExecutive Officer, Directori
On the board, as filediJohn CowgillRob Toews
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.
Everyone who backed them
Missing a round, or an investor who was in one? Tell us.
Also claim to have backed them
These 3 firms list Muon Space 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.
Quick answers about Muon Space
How much has Muon Space raised?
Muon Space has raised $295M across 2 rounds since 2025.
When did Muon Space last raise?
Muon Space's most recent round was a Series C of $250M in Aug 2026, led by Eclipse Capital.
What was Muon Space's biggest round?
Its most recent round, $250M in Aug 2026, is also its largest on record.
Who backed Muon Space first?
Muon Space's first round on record, in Oct 2025, was backed by Costanoa Ventures, South Park Commons and Radical Ventures and 3 others.
What stage is Muon Space at?
Muon Space's latest named round is a Series C, in Aug 2026.
Where is Muon Space based?
Muon Space is based in the United States.
Who led Muon Space's rounds?
Eclipse Capital led the Series C in 2026.
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