WillItSurvive
Space, defense and state enterprises · United States

Castelion

castelion.com ↗

Startup building low-cost, mass-produced hypersonic missiles for the US military.

Defensible for now
Assessed 24 July 2026 · Evidence as of 24 July 2026
Real protection, with named pressure against it.
On the recordSince 24 July 2026 · Checkable from 2027 · Every call on the record Checkpoint: F/A-18 integration targeting Early Operational Capability
The call

Castelion has the contracts and hardware today; whether Anduril or Ursa Major catch up on production deals within a year decides if this stays a two-horse race or three.

Castelion builds cruise missiles and hypersonic weapons for the U.S. military and has already flown them over 21 times with contracts promising at least 500 missiles per year. The big defense companies like Lockheed Martin and Raytheon cannot easily compete because their business model relies on charging high prices, not building lots of cheap weapons. The real challenge is that other well-funded startups, especially Anduril and Ursa Major, are racing to do the same thing and should have their own competing weapons ready by mid-2026. What matters most: whether Castelion can get its Project Ranger missile actually working and installed on Navy jets by the end of 2026, and whether Anduril can actually land its own guaranteed military production contract before then.

Why
01
AI pressure: None apparent. AI doesn't build or fly missiles here; the fight is over factories, contracts, and flight tests, not models. Could AI do the core job? Unlikely.
02
Bigger players: Anduril Industries and Ursa Major. Anduril posted hypersonics jobs in July 2026 and Ursa Major raised $100M for its Havoc vehicle; neither has Castelion's production deal yet. Could a giant copy it? No, they are blocked.
03
What protects it. A signed Department of War framework locking in 500+ missiles a year, plus 21+ flight tests and ITAR-cleared manufacturing sites already running.
What would change this call
Anduril or Ursa Major announces its own DoW hypersonics production framework within 12 months. Would show Castelion's production-scale moat is no longer unique.
Project Ranger (Sandoval County, NM) reaches operational status by end of 2026. Confirms Castelion's manufacturing capacity claim is real, not aspirational.
F/A-18 integration hits Early Operational Capability in 2027 as planned. Confirms Castelion's Blackbeard system is moving from testing to fielded weapon.
Key numbers
  • $350M Series B closed (Dec 5, 2025)
  • DoW deal: 500+ missiles/year minimum (May 13, 2026)
  • $105M Navy contract for F/A-18 integration (Apr 24, 2026)
Named risks
  • Anduril or Ursa Major could win own DoW production framework agreement within 12 months, eroding first-mover edge. Severity: high
  • Project Ranger's 21 planned structures may not reach operational status by end-2026 as targeted. Severity: medium
  • Repeated Blackbeard flight-test failures could undermine confidence in production readiness. Severity: medium
  • Heavy dependence on continued Pentagon budget appropriations for hypersonic weapons programs. Severity: medium
  • No disclosed profitability or audited revenue; reliant on continued government contract wins. Severity: low
Rivals, as read in July 2026
RivalDirectionEvidence
Anduril IndustriescontestingEntered hypersonics via job postings, named potential Army supplier as of 2026-07-15
Ursa MajorcontestingRaised $100M Series E for Havoc vehicle, 2026-02-04, named alongside Castelion 2026-07-14
Lockheed Martin, RTX, Northrop Grumman (Dark Eagle)gaining onPrimes locked into cost-plus, low-volume economics as Army seeks low-cost alternatives, 2026-07-16
StratolaunchcontestingBuilds Talon-A hypersonic testbed using Ursa Major engine, positioned in flight-test niche, 2025-05-06
Questions people ask
Is Castelion profitable in 2026?
Castelion discloses no audited revenue or profit figures. It is funded through venture capital, most recently a $350M Series B closed December 5, 2025, plus U.S. government contracts including a $105M Navy F/A-18 integration deal announced April 24, 2026, rather than commercial sales.
Who owns Castelion?
Castelion is a private company founded November 2022 by ex-SpaceX executives Bryon Hargis (CEO), Sean Pitt, and Andrew Kreitz (CFO). Its Series B, closed December 5, 2025 for $350M, was led by Altimeter Capital with Lightspeed, a16z, General Catalyst, and Lavrock as investors.
Could AI replace Castelion?
No. Castelion is a hardware, manufacturing, and ITAR-regulated defense business building physical hypersonic missiles at a 1,000-acre New Mexico plant. AI only touches guidance/mission software, not the physical production, flight-test data, or government contract relationships that form its core moat.
Who is Castelion's biggest competitor?
Anduril Industries and Ursa Major are the closest emerging rivals. Anduril entered hypersonics with job postings in mid-2026 and Ursa Major raised a $100M Series E in February 2026 for its Havoc vehicle; both were named alongside Castelion by an Army general on July 14, 2026.
Has Castelion had layoffs?
No layoffs are reported. Castelion has instead expanded, moving into a 90,000 sq ft Torrance, California headquarters in April 2025 and starting construction on the 1,000-acre Project Ranger campus in New Mexico, announced November 2025.
What government contracts does Castelion have?
Castelion holds a Department of War production framework agreement signed May 13, 2026 guaranteeing at least 500 Blackbeard missiles per year once validated, a $105M Navy F/A-18 integration contract from April 24, 2026, and a ~$49.998M Navy SBIR Phase III order from February 25, 2026.
Timeline
  • 2026-07-14Army Lt. Gen. Frank Lozano names Castelion, Anduril, Ursa Major as active hypersonic suppliers
  • 2026-06-11Saronic partnership announced for 2027 at-sea hypersonic launch demo from Marauder USV
  • 2026-05-13Department of War production framework signed, min 500 Blackbeard missiles/year
  • 2026-04-24$105M Navy contract for F/A-18 Super Hornet Blackbeard integration, targeting EOC 2027
  • 2026-02-25Navy SBIR Phase III order, ~$49.998M, for Blackbeard prototypes and flight testing
  • 2025-12-05Series B closes at $350M, led by Altimeter Capital
  • 2025-04Castelion moves into 90,000 sq ft Torrance, CA headquarters
  • 2025-01-29Series A closes at $100M, led by Lightspeed Venture Partners
  • 2023-10Seed round of ~$14.1M raised
  • 2022-11Castelion founded by ex-SpaceX executives Hargis, Pitt, Kreitz
Revision history
24 July 2026
First assessed. Defensible for now. The text above is fixed as of this date and is not edited afterwards.
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