A factory can be reshored without the supply chain being reshored.

That distinction is now one of the most undercovered risks in U.S. industrial strategy. A company may move final assembly to Ohio, Texas, Tennessee, Arizona, or South Carolina and still depend on imported controls, sensors, specialty chemicals, machine tools, power electronics, castings, resins, circuit boards, or precision components.

This is the supplier gap.

It is easy to photograph a ribbon cutting. It is harder to localize the second- and third-tier suppliers that make the plant work. Black Book Insights’ May 2026 reshoring assessment flagged this directly: supplier localization remains incomplete, and many companies still depend on offshore inputs even after moving production closer to the U.S. customer.

The supplier gap changes the definition of reshoring. A domestic plant with offshore bottlenecks may reduce labor-distance risk, but it does not eliminate geopolitical risk, tariff exposure, port disruption, or origin-compliance exposure.

This matters most in sectors with deep component stacks: electronics, autos, batteries, medical devices, aerospace, industrial equipment, and energy infrastructure. These are the industries where a single missing input can idle a line.

Policy pressure will make the gap more visible. USTR’s 2026 structural overcapacity investigations cover a wide range of industrial sectors, including aluminum, automobiles, batteries, chemicals, electronics, machinery, robotics, semiconductors, steel, solar modules, and transportation equipment.

The policy signal is clear: the United States is not only scrutinizing finished goods. It is scrutinizing the industrial systems behind them.

The companies that treat reshoring as a real-estate project will miss the point. The companies that treat it as supplier-system redesign will have the advantage.

The next serious reshoring map will not start with the factory.

It will start with the bill of materials.