Anduril pitches Steelfin at less than half Lockheed Martin's PAC-3 MSE cost; no variant has flown

AndurilPVT$116.89B — Anduril, private, latest valuation $116.89B unveiled the Steelfin interceptor family at the Association of the U.S. Army's annual convention on October 12, 2026, and the announcement↗ that matters is a price list ¹². Steve Milano, who leads Air Dominance and Strike at Anduril, said a Steelfin variant would fly about 80 percent of the Patriot PAC-3 MSE's mission for less than half that interceptor's cost ¹³. A larger one, he said, would cover the entire THAAD mission for a fraction of the price, and a naval version more than 80 percent of an SM-2's capability for a third of the cost ¹³.

Steelfin arrives unproven

Lockheed Martin▼−1.25% — Lockheed Martin, down 1.25 percent today builds both of the Army missiles in those claims: the PAC-3 MSE, or Missile Segment Enhancement, the current Patriot round, and THAAD, the Army's high-altitude shield ⁴⁵. The threat to Lockheed is not one missile but the manufacturing doctrine behind the claims: a common production line able to attack every product at once. Steelfin arrives unproven. Ballistic tests with representative vehicles are done, but no variant has been flight-tested, the first flights come in 2027, and no quantity is contracted ¹⁶.

The design is a production line

Steelfin is a two-stage missile: a booster that changes with the mission, and a terminal stage that shares one airframe, one set of avionics, one software base and one set of interfaces across every variant ⁶. Open interfaces let Anduril buy seekers and other components from competing suppliers, commercial parts included ⁶⁷.

The cost claim lives in the factory: every variant moves through one line with the same tooling and technicians, so output shifts toward whichever missile the fight demands ⁶. Anduril plans several thousand interceptors a year at first, full-rate production by the end of 2028 or the start of 2029, and volumes Milano puts "closer to hundreds of thousands" if demand arrives ²⁶. The variants fit launchers and fire control the force already fields, the Patriot M903A2, the Navy's Mk 41, the Army's Typhon, AEGIS and IBCS, so a buyer adds missiles rather than infrastructure ¹⁶.

The buyer moved first

Anduril president Christian Brose told reporters the force is "struggling with a set of legacy interceptors that are not scalable" against drones and missile raids ². Procurement agrees with him. In May the Army asked industry for a Patriot-compatible interceptor under $1 million, and the Navy is pursuing its own modular missile family ¹. Anduril is already through one gate, picked after the Army's xTech Apex Intercept competition↗ to advance to testing and demonstrations in that low-cost program ².

Lockheed is defending both ends of its ladder

Lockheed has the exposure, and it is already moving. A seven-year PAC-3 agreement announced in January was raised in July by a modification worth up to $53.86 billion↗, lifting the multiyear total to $58.62 billion, with the aim of more than tripling annual output ⁵. Days before Anduril's launch it unveiled the PAC-3 Edge, a more capable Patriot round for the Army's Future Interceptor program, alongside the PAC-3 ACE, a cheaper interceptor pitched at under half the MSE's price ⁵⁸⁹.

The incumbent is segmenting its own market before anyone takes it away. The open difference is the factory: Lockheed's cheaper round will come off the same Camden, Arkansas line as the exquisite one, while Anduril intends to build most Steelfin subassemblies at Arsenal-1, its plant in Ohio ²⁵.

The missing link is certification

Anduril has never fielded a surface-to-air missile, and modular interceptor programs have a long record of compromise ¹. Fitting existing launchers is not the same as being cleared to fire from them; every configuration still has to pass integration and safety testing ³. Until variants fly in 2027 and a contract names a quantity, the price numbers stay a pitch ¹⁶.

Two decisions for the calendar

Anduril is private, valued at $61 billion in May, so the fight has one listed side: Lockheed owns the franchises under attack ¹⁰. Holders can put two decisions on a calendar: the Army's award under that sub-$1 million solicitation↗ ¹, and Future Interceptor testing in 2027, which Lockheed's Edge enters against one unnamed rival, the same year Steelfin first flies ¹²⁵. Anduril declines to say whether it is that rival ². Whoever certifies a cheap missile into launchers the Pentagon already owns will deserve the volume that follows.