Funding round
Muon Space Series B
Muon Space, which works in satellite constellation design and construction in Mountain View, raised $146M in a Series B round announced on 12 Jun 2025, led by Congruent Ventures. 6 firms took part. It is Muon Space's third venture round on record; the one before was a Series A in Aug 2022.
$146M
Amount raised
of which $45M debt
Not disclosed
Post-money valuation
6
Investors
1 lead
Valuation
What this round says about the price
Muon Space did not disclose a valuation in this round; its last disclosed one was $119M at the Series A (Aug 2022). It came 34 months after Muon Space's Series A. It is 34% of the $431M Muon Space has raised in the venture rounds on record. Muon Space raised again 14 months later: a Series C round of $250M in Aug 2026, at $1.50B post-money.
Muon Space's funding rounds
Muon Space has 4 venture rounds on record. This one is highlighted.
Investors
Who put money in
Congruent Ventures led the round with 5 other firms.
Lead investor
- backs 45 venture-backed companies
Also in the round
- backs 29 venture-backed companies
- backs 41 venture-backed companies
- backs 85 venture-backed companies
- backs 65 venture-backed companies
- backs 27 venture-backed companies
Use of proceeds
What the money is for
According to the announcement, the money goes to product development, scaling operations, acquisitions and working capital.
- Product development
- Scaling operations
- Acquisitions
- Working capital
Comparable rounds
How it compares
40 Series B rounds in Aerospace and Defence within a year either side disclosed an amount; the median was $56M, and this round was 2.6 times the median. The closest in time, other companies' Series B rounds in Aerospace and Defence:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Mach Industries Aerospace and Defence | 17 Jun 2025 | $100M | $470M | Khosla Ventures and Bedrock |
| Aerospace and Defence | 26 Jun 2025 | $13M | $201M | not named |
| Aerospace and Defence | 12 May 2025 | $105M | not disclosed | Lockheed Martin Ventures |
| Aerospace and Defence | 2 Jul 2025 | $30M | not disclosed | RTX Ventures |
| Aerospace and Defence | 8 May 2025 | $21M | not disclosed | Razor’s Edge Ventures |
| Aerospace and Defence | 26 Aug 2025 | $110M | not disclosed | Noshaq |
| Aerospace and Defence | 23 Apr 2025 | $100M | not disclosed | General Innovation Capital Partners |
| K2 Space Aerospace and Defence | 13 Feb 2025 | $110M | not disclosed | Lightspeed Venture Partners and Altimeter |
Sources
Where this comes from
Reported by 1 source. The deal data marks this round as not yet confirmed by an official announcement. Unconfirmed
Questions
Frequently asked
How much did Muon Space raise in its Series B round?
Muon Space raised $146M in its Series B round, announced in Jun 2025.
Who led Muon Space's Series B round?
Congruent Ventures led it, with Activate Capital, ACME Capital, Costanoa, Radical Ventures and ArcTern Ventures.
What was Muon Space's valuation at the Series B round?
It was not disclosed; its last disclosed one was $119M at the Series A (Aug 2022).
How does it compare with other Series B rounds in Aerospace and Defence?
40 Series B rounds in Aerospace and Defence within a year either side disclosed an amount; the median was $56M, and this round was 2.6 times the median.
Did Muon Space raise again after this round?
Yes: a Series C round in Aug 2026 of $250M at $1.50B post-money.