The brothers · AJ2
Adrien Lepleux
Angel investor and defense technology operator.
Adrien Lepleux is a partner at AJ2, the deep tech angel investment vehicle he shares with his brother Julien. He is Chief of Staff at Firestorm.
From investing to operating
Before joining Firestorm, Adrien invested in startups on behalf of Hermès. His work now combines an operating role in defense technology with angel investing through AJ2.
Firestorm develops unmanned aircraft and portable manufacturing systems. Adrien’s role at the company gives his work in deep tech an operating dimension alongside his investing experience.
AJ2
Adrien and Julien invest together in Exodys Energy, Firestorm, The ImmuneCo and Catalyx Space. Their shared direction is an abundant future: more useful energy, stronger industrial capabilities, better environmental health and infrastructure for space.
AJ2 investments
Professional background reviewed September 2026.