Big round · 20 August 2026

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

By Millionrounds ResearchPublished 16 September 2026

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. It is the 200th largest equity round we recorded in the twelve months to that date, and the 35th largest Series C of 194. The median Series C over the same period was $100M, so this one is 2.5 times that.

Raised$250M2 sources reported it
StageSeries Cfirst round on record
Investors51 named as lead
Where USUnited States

Aerospace & SpaceClimate TechDefence 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.

#200equity round of the last twelve months
#35Series C of 194 in that time
#140round 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

Also in the round

Funding history

  1. August 2026Series C$250M

This is the first round we hold for the company.

Reported by

  1. TechStartups20 August
  2. Ventureburn20 August

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

Other big rounds that week

Starcloud$250M Series ACastelion$800M Series CCallosum$100M SeedGroq$350M Series AAlso$150M Series DWWispr$280M Series B
The companyMuon Space on Millionrounds→Weekly roundupWeek of 17 August→Monthly roundupAugust 2026→