Anduril unveils Steelfin family of modular air-defense missiles

Company announcement Curated by Anduril News from Anduril newsroom and 5 more · October 12, 2026 · 2 min read

What happened

Anduril unveiled Steelfin, a surface-to-air interceptor missile system built around a common two-stage architecture that can be reconfigured for different threats without requiring years of redesign. The first stage uses interchangeable solid rocket motor boosters; the second stage shares a baseline airframe, avionics, and flight control system across all variants, with swappable seekers and mission systems. This modular design allows the same production line, tooling, and technicians to manufacture variants for point defense, lower-tier integrated air and missile defense, and upper-tier ballistic missile defense—each at a fraction of the cost of today's benchmark interceptors in their class.

The company said Steelfin variants are compatible with existing U.S. military launch infrastructure, including the M903A2 launcher, Mk 41 Vertical Launch System, Typhon, and emerging containerized systems, as well as fielded fire control software such as AEGIS and IBCS. Anduril has completed ballistic testing with representative air vehicles and plans to begin flight testing Steelfin variants next year. The company is planning to produce on the order of several thousand Steelfin variants per year in the short term, with production capacity designed to flex to demand.

The announcement addresses what Anduril describes as a cost-exchange problem in air defense: warfighters are forced to expend expensive, sophisticated interceptors against lower-cost threats, draining stockpiles of critical defensive weapons. The modular approach aims to allow tailored matches of interceptor capability and cost to specific threats.

Background

Modern air defense faces unprecedented challenges from large volumes of low-cost offensive weapons, including drones, cruise missiles, and hypersonic threats. Traditional interceptor missiles like Patriot PAC-3 are built around fixed architectures optimized for narrow threat sets, and adapting them to new requirements typically requires years of redesign, new production lines, and significant costs. This delay can leave warfighters with capability gaps. Anduril, a defense-technology company founded in 2017, has been developing Steelfin for years with multiple customers. The company also produces Lattice, a software command platform used by the U.S. Army.

What to watch next

Anduril plans to begin flight testing Steelfin variants in 2027. The company's path to production will likely depend on U.S. military adoption decisions and potential foreign military sales approvals. Watch for contract awards or test milestones that would signal customer interest.