Andreessen Horowitz (a16z) is backing Westmag, a startup manufacturing motors and actuators domestically in the United States, signaling a strategic shift toward supply chain resilience in defense and robotics sectors. The venture capital firm is leading the seed funding round for Westmag, which operates a semi-automated production line in South San Francisco and focuses on producing components that are foundational to physically actuated devices like drones and humanoid robots.

Why Is Domestic Manufacturing Suddenly Critical for AI Hardware?

The U.S. industrial base has long relied on foreign suppliers for essential components, particularly from China, which dominates global production of motors and actuators. These parts are described as the "muscle of physical AI," enabling robots and drones to move and interact with the physical world. However, recent regulatory changes and geopolitical tensions have exposed vulnerabilities in this dependency. The Federal Communications Commission (FCC) implemented a ban on foreign-made drone components in December 2025, creating immediate pressure on American companies to find domestic alternatives.

Many American firms have built products on what a16z describes as an "unstable foundation of externally sourced critical parts." This leaves them exposed to supply disruptions, regulatory penalties, and national security concerns. Westmag's initiative to establish a controlled, domestic supply chain directly addresses this urgent gap, particularly for defense applications and the rapidly expanding humanoid robotics sector.

Who Are the Founders Behind This Supply Chain Solution?

Westmag was founded by David Hansen and Jordan Sanders, who bring complementary expertise to the challenge. Hansen, known as "the motor guy," brings deep technical knowledge of motor design and manufacturing, while Sanders provides operational execution capabilities needed to scale production. Together, they are positioning Westmag to become a critical supplier for defense clients and the broader robotics industry seeking ITAR-compliant components, which are required for defense applications and must be manufactured domestically.

How to Understand a16z's Strategic Focus on Physical AI Infrastructure

• Defense and Robotics Priority: a16z's investment highlights the firm's strategic focus on foundational technologies for the physical world, particularly within sectors like defense and robotics where supply chain resilience is paramount.
• Regulatory Tailwinds: Recent FCC bans on foreign-made drone components create a strong regulatory environment favoring domestic manufacturers, aligning with explosive demand from both defense and humanoid robotics applications.
• Supply Chain Resilience: The investment underscores the increasing strategic importance of domestic manufacturing for advanced technologies, addressing reliance on foreign components and mitigating geopolitical risks.

a16z has previously emphasized the growing opportunities in robotics supply chain and the broader implications for AI manufacturing. This Westmag investment represents a concrete bet that controlling critical components domestically will become a competitive advantage for American robotics and defense companies.

The timing of this investment is particularly significant. As regulatory pressure mounts and geopolitical tensions persist, companies that can access reliable, domestically manufactured motors and actuators will have a substantial edge. Westmag's semi-automated production line is already scaling to meet demand from defense clients, suggesting that the market opportunity extends beyond early-stage startups to established defense contractors seeking alternatives to foreign suppliers.

This move reflects a broader shift in venture capital strategy, where a16z and other leading firms are increasingly viewing supply chain control as a core competitive moat for AI-enabled hardware companies. Rather than focusing solely on software or algorithms, investors are recognizing that the physical infrastructure underlying robotics and autonomous systems requires domestic, resilient manufacturing capabilities to succeed in an era of heightened geopolitical uncertainty.