Jonathan Siegmann

Jonathan Siegmann joined Stifel in 2025 and serves as a Managing Director covering the aerospace and defense industry. Most recently, he was engaged in the new space industry and served as Senior Vice President of Corporate Development at Terran Orbital Corporation, which was sold to Lockheed Martin in 2024. Before that, Jonathan spent nearly 15 years at Fidelity Investments as Portfolio Manager and Equity Research Analyst, covering public and private North American aerospace, defense, and new space companies. Jonathan received a BS from Rensselaer Polytechnic Institute and an MBA from New York University’s Stern School of Business and is a Chartered Financial Analyst® holder from the CFA Institute.