Cantos is a venture capital firm that provides pre-seed and seed-stage funding to founders building near-frontier technologies that transform the physical world. It focuses on critical industries including energy, defense, aerospace, climate tech, computational biology, and advanced manufacturing. The firm is based in San Francisco with team members also in Los Angeles and manages over $120 million. Notable investments include Castelion, Astranis, Atom Computing, and Solugen. Ian Rountree is General Partner.