Funding round
Castelion Series C
Castelion, which works in defense technology research and development in Torrance, raised $1.00B in a Series C round announced on 19 Aug 2026, led by J.P. MorganChase’s Strategic Investment Group, Andreessen Horowitz, Carlyle and JPMorgan Chase, at a $13.00B post-money valuation. 10 firms took part. It is Castelion's fifth venture round on record; the one before was a Series B in Dec 2025.
$1.00B
Amount raised
of which $250M debt
$13.00B
Post-money valuation
$12.00B pre-money
10
Investors
4 leads
5.8%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Castelion at $13.00B after the new money. The $1.00B bought investors about 5.8% of the company. It came 8 months after Castelion's Series B. It is 69% of the $1.44B Castelion has raised in the venture rounds on record. No later venture round is on record for Castelion.
Castelion's funding rounds
Castelion has 5 venture rounds on record. This one is highlighted.
- Pre-seed 1 Apr 2023, led by Lavrock Ventures $5.4M
- Seed 5 Oct 2023, led by Andreessen Horowitz and Lavrock Ventures $14M
- Series A 29 Jan 2025, led by Lightspeed Venture Partners $70M
- Series B 5 Dec 2025, led by Altimeter and Lightspeed Venture Partners $350M
- Series C this round 19 Aug 2026, led by J.P. MorganChase’s Strategic Investment Group, Andreessen Horowitz and Carlyle $1.00B$13.00B post-money
Investors
Who put money in
J.P. MorganChase’s Strategic Investment Group, Andreessen Horowitz, Carlyle and JPMorgan Chase led the round with 6 other firms.
Lead investors
- J.P. MorganChase’s Strategic Investment Group new investor
- Andreessen Horowitz backs 722 venture-backed companies new investor
- Carlyle backs 22 venture-backed companies new investor
- JPMorgan Chase
Also in the round
- Lightspeed Venture Partners backs 454 venture-backed companies new investor
- backs 22 venture-backed companies new investor
- Altimeter backs 67 venture-backed companies new investor
- General Catalyst backs 574 venture-backed companies new investor
- Interlagos new investor
- T. Rowe Price Associates, Inc new investor
Use of proceeds
What the money is for
According to the announcement, the money goes to product development, scaling operations and working capital.
- Product development
- Scaling operations
- Working capital
Comparable rounds
How it compares
14 Series C rounds in Aerospace and Defence within a year either side disclosed an amount; the median was $244M, and this round was 4.1 times the median. The closest in time, other companies' Series C rounds in Aerospace and Defence:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Muon Space Aerospace and Defence | 20 Aug 2026 | $250M | $1.50B | Eclipse |
| Aerospace and Defence | 11 Aug 2026 | $250M | $2.50B | Sequoia Capital and American Strategic Technology Fund |
| The Exploration Company Aerospace and Defence | 8 Sep 2026 | $450M | not disclosed | Bessemer Venture Partners and Atomico |
| Aerospace and Defence | 1 Sep 2026 | $334M | not disclosed | Mitsubishi Electric and COFIDES |
| Aerospace and Defence | 7 Sep 2026 | $100M | not disclosed | Temasek and Seraphim Space |
| Aerospace and Defence | 16 Jul 2026 | $70M | not disclosed | Swisscom Ventures |
| Mach Industries Aerospace and Defence | 2 Jun 2026 | $300M | $1.80B | Infinite Capital and Ribbit |
| Sierra Space Aerospace and Defence | 5 Mar 2026 | $550M | $8.00B | LuminArx Capital Management |
Sources
Where this comes from
Reported by 3 sources.
Questions
Frequently asked
How much did Castelion raise in its Series C round?
Castelion raised $1.00B in its Series C round, announced in Aug 2026.
Who led Castelion's Series C round?
J.P. MorganChase’s Strategic Investment Group, Andreessen Horowitz, Carlyle and JPMorgan Chase led it, with Lightspeed Venture Partners, Lavrock Ventures, Altimeter, General Catalyst and Interlagos and 1 more.
What was Castelion's valuation at the Series C round?
$13.00B post-money ($12.00B pre-money).
How does it compare with other Series C rounds in Aerospace and Defence?
14 Series C rounds in Aerospace and Defence within a year either side disclosed an amount; the median was $244M, and this round was 4.1 times the median.