Surtr

Surtr is a Defense startup based in San Francisco, CA, United States that has raised $5M in venture capital across 1 funding round since 2026. The company reached Seed stage in July 2026 with a $5M round led by Allegis Capital. Surtr's investor base includes 5 institutional funds, with Allegis Capital leading the most recent equity round.

Surtr builds ParallaxOS, a hardware-agnostic operating system for counter-UAS (C-UAS) operations that ingests sensor data from any radar, RF detector, camera, or acoustic array and fuses it into a single unified operational picture with AI-driven threat classification and engagement recommendations. The platform replaces the fragmented multi-screen setups facing drone-defense operators by integrating heterogeneous sensors, command-and-control tools, and effectors — including an autonomy layer capable of automatically cueing effectors against incoming aerial threats. Founded by former autonomy engineers from Anduril and Shield AI, Surtr validated its software with Ukrainian military operators in Kyiv in May 2026, achieving FPV-drone detection and tracking at sub-100ms latency.