Epirus is a defense technology company best known for Leonidas, a software-defined directed-energy weapon that emits high-power microwave (HPM) pulses to disable the electronics of drones and drone swarms at range. Unlike kinetic interceptors or single-shot lasers, Leonidas can neutralize many targets at once with an effectively unlimited magazine, making it a cost-asymmetric answer to cheap mass-produced UAS threats. Epirus pairs solid-state amplifier hardware with AI-driven beam steering and target discrimination to engage threats while sparing friendly electronics. The company has secured U.S. Army contracts and is expanding Leonidas variants for fixed-site, mobile, and counter-electronics missions, as well as commercial and international markets. Headquartered in Torrance, California, Epirus has become one of the most heavily funded counter-drone startups in the U.S. defense sector.