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Castelion
Torrance, California · Founded 2022
Valuation
$2.8BEst.
Raised
$1.5BEst.
Stage
Series C
Open roles
110
Castelion designs, tests, and manufactures next-generation military systems rapidly and at massive scale to deter future wars.
Funding History
Series C$1.0B
Aug 2026 · Lead: Andreessen Horowitz, J.P. Morgan
Participants: Lightspeed Venture Partners, Lavrock Ventures, Altimeter Capital, General Catalyst, Interlagos Capital, T. Rowe Price
+186% · 2.86x · 8 mo vs. Series B
Series B$350M
Dec 2025 · Lead: Altimeter Capital, Lightspeed Venture Partners
Participants: Andreessen Horowitz, General Catalyst, Lavrock Ventures, First In, Silent Ventures, Space VC, Cantos, BlueYard Capital, Avenir, Champion Hill Ventures, Interlagos Capital
+250% · 3.5x · 9 mo vs. Series A
Series A$100M
Mar 2025 · Lead: Lightspeed Venture Partners
Participants: Andreessen Horowitz, Silent Ventures, Lavrock Ventures, Cantos, First In, BlueYard Capital, Interlagos Capital
+604% · 7.04x · 17 mo vs. Seed
Seed$14M
Oct 2023 · Lead: Andreessen Horowitz, Lavrock Ventures
Participants: First In, BlueYard Capital, Champion Hill Ventures
Other Participating Investors
Nomi Capital
Round Size Change
Latest Round Change
+186%2.86x
$1.0B Series C vs. $350M Series B
Seed
$14M
Oct 2023
+604% · 7.04x
→
17 mo
Series A
$100M
Mar 2025
+250% · 3.5x
→
9 mo
Series B
$350M
Dec 2025
+186% · 2.86x
→
8 mo
Series C
$1.0B
Aug 2026
Open roles at Castelion
GNC EngineerTorrance, CASenior Avionics Test EngineerRio Rancho, NMGNC Engineer – Actuation SystemsTorrance, CAStaff Dimensional Metrology EngineerTorrance, CAAvionics Harness Design EngineerTorrance, CAInventory SpecialistRio Rancho, NMSenior Logistics SpecialistRio Rancho, NMShipping and Receiving SpecialistRio Rancho, NM
Showing 8 of 110Careers page ↗
News & press
Castelion Raises $1B Series C to Scale Production of Low-Cost Hypersonic Weapons - Castelion
Aug 19, 2026
Valuation and funding totals are directional estimates and may not reflect confirmed terms.
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