Defense Stock Showdown: SpaceX vs. Lockheed Martin -- Which Is the Smarter Long-Term Buy?

The defense stock debate is framed as SpaceX versus Lockheed Martin, highlighting how each company could shape future capabilities in government-led national security. Lockheed Martin develops and sells weapons systems, vehicles, and technologies to the U.S. government and allies, while SpaceX focuses on AI and rocket launches rather than selling weapons directly. The article notes the U.S. federal government accounted for about a fifth of SpaceX’s total revenue in 2025. It cites defense-focused opportunities including SpaceX’s satellite communications and surveillance constellations, orbital data centers, and a planned multilayer missile defense concept called Golden Dome, along with AI traction tied to court document references about U.S. military use of xAI technology. Risks include SpaceX’s valuation, cited at a $2.4 trillion market capitalization and more than 120 times 2025 revenue, compared with Lockheed’s established systems such as THAAD, PAC-3, and SBIRS.