GlobalFoundries and TSMC have reached an agreement to establish a supply of silicon interposers manufactured in the United States, according to a report by MarketScreener.

The deal pairs the largest US-headquartered specialty foundry with the world's dominant advanced-node contract manufacturer. Both companies confirmed the arrangement concerns silicon interposers, the packaging components that connect chips — typically logic dies and high-bandwidth memory — within multi-die assemblies.

Why do interposers matter?

Silicon interposers sit at the center of advanced packaging. They carry thousands of connections between dies stacked or placed side by side in a single package, and they have become a bottleneck component as chipmakers shift toward chiplet architectures.

Most interposer capacity today sits in Asia, alongside the leading-edge packaging infrastructure of the major foundries. A US-based supply changes that calculation for customers building multi-chip products under domestic-sourcing requirements, including defense and critical-infrastructure programs.

What does the agreement change?

For TSMC, the deal extends an existing US footprint that already includes wafer fabrication in Arizona. Adding packaging-related capability on American soil would shorten the geographic gap between its US fab output and the back-end steps needed to finish advanced products.

For GlobalFoundries, the partnership adds a packaging role to its US operations, which center on specialty process nodes rather than leading-edge logic. Interposer supply complements its existing business in mainstream and differentiated technologies.

Neither company has yet published technical specifications, volume targets, timelines, or site details for the interposer supply. MarketScreener reported the agreement itself; the announcement did not include figures on planned capacity or investment.

Who benefits?

US chip designers building multi-die systems stand to gain a domestic option for a component they currently source through Asian packaging chains. The agreement also aligns with federal policy that has pushed semiconductor manufacturing — front-end and back-end alike — toward American soil through funding and procurement pressure.

The collaboration is notable for pairing two foundries that compete for customers in several segments. Joint arrangements on shared manufacturing infrastructure remain rare in the contract-chip business, where packaging capability has traditionally stayed proprietary.

Details on production sites, qualification schedules, and initial customers have not been disclosed. Additional announcements from the two companies are expected as the agreement moves toward implementation.