The Pentagon is set to become the largest shareholder in rare earth miner MP Materials, causing the company's shares to jump 40%. This move follows statements made by Interior Secretary Doug Burgum in April, indicating the Trump administration's consideration of equity investments in critical mineral miners. The investment aims to reduce reliance on foreign sources, particularly China, for essential minerals used in defense and technology industries. The Pentagon's stake signifies a strategic effort to secure domestic supply chains and bolster national security.