GlobalFoundries Fills a Gap in US Chips

When TSMC began producing Nvidia's Blackwell GPUs at its Arizona plant last year, the finished wafers still had to cross the Pacific. The Register noted that the final product was round-tripped to Taiwan and back for final assembly. An American chip, made in America, took a detour through Asia to become a usable one.

On October 8, 2026, GlobalFoundries announced a deal aimed at part of that detour. It will manufacture silicon interposers for TSMC's CoWoS advanced packaging ecosystem at its Malta, New York, facility, and says it will be the first U.S.-based source of the component. The company's release headline calls the arrangement a "Multi-year $2 billion agreement."

The deal matters because packaging, not wafer fabrication, has become the pinch point. Reuters reported that advanced packaging is a major constraint on AI chip production, with demand exceeding available manufacturing capacity. The Register called it a major bottleneck for American chipmaking. Yet the Malta capacity is slated to arrive after the shortage has bitten.

What Malta will make

The interposer is the unglamorous piece. Reuters described it as the component beneath processors and memory chips inside advanced AI packages, letting them talk at high speed. Tom's Hardware put it more bluntly: custom silicon providing high-density connections between logic chiplets and high-bandwidth memory stacks.

GlobalFoundries is not stepping into TSMC's role. Tom's Hardware wrote that it will be a subcontractor, not a TSMC supplier, making multiple customer-specific interposer designs. The company quit leading-edge process development in 2018, but Tom's Hardware noted its manufacturing remains suitable for certain components in multi-chip packages, including CoWoS-S interposers. Whether it can join TSMC's CoWoS-L supply chain is, the outlet wrote, an open question.

Ed Kaste, GlobalFoundries' senior vice president of CMOS Business, said the company is creating "a secure, scalable source of essential advanced-packaging elements" from its U.S. manufacturing footprint. The commercial pitch follows: Tom's Hardware reported the arrangement will let TSMC's clients brand products as completely made and packaged in America.

Investors liked it. Reuters reported GlobalFoundries shares up about 4% in premarket trading.

Stocktwits reported that the shares rose nearly 6% in morning trade, on track for an over one-month high.

What the announcement leaves out

The headline number comes with little behind it. Tom's Hardware reported that the companies have not disclosed installed capacity, planned volumes, capital spending, or how the $2 billion divides up. The agreement has an initial term of five years and offers a framework for future expansion, GlobalFoundries said.

Its own risk language is more candid. The release lists CHIPS and Science Act and New York State Green CHIPS funding among the risks and says expansions may not proceed as planned if expected funding is delayed or withheld.

The deeper limit is that an interposer is one link in a chain. Tom's Hardware noted the deal does not cover the capacity needed to attach logic chiplets and memory stacks to interposers, assemble them onto organic substrates and run electrical tests. Its conclusion: expanding interposer production alone will not raise the number of finished AI processors without enough chip-on-wafer assembly and testing. And the memory stacks themselves would still come from Asian manufacturers for a while, though Micron and SK hynix both plan U.S. HBM assembly facilities this decade.

The calendar problem

GlobalFoundries says volume production is expected to begin ramping at Malta in the first half of 2028. The Register put it as the earliest that production could start. The assembly sites that would complete the domestic chain run on similar clocks. The Register reported that TSMC's contract with Amkor for CoWoS-compatible packaging in the U.S. and its own Arizona packaging plant are not expected online until 2028 and 2029 respectively.

Amkor and TSMC announced their 10-year Arizona agreement on June 16, 2026. Amkor CEO Kevin Engel said it lets customers have "a full U.S. supply chain from advanced silicon manufacturing to tested packaged devices." Amkor's own release carries a warning, though: there can be no assurance the Arizona campus will be built on time, at the expected cost or to specification, or at all. TSMC and GlobalFoundries have not said how CoWoS assembly will be split between TSMC and Amkor, or whether the New York interposers will even be used in Arizona, Tom's Hardware wrote.

Meanwhile, demand is not waiting. TSMC said its September 2026 revenue was approximately NT$511.86 billion, up 54.6 percent from September 2025, and revenue for January through September 2026 totaled T$3,898.73 billion, up 41.1 percent on the same period of 2025.

TrendForce, relaying Economic Daily News, reported that TSMC's monthly CoWoS capacity could reach a record 120,000 to 140,000 wafers in 2026, and that the supply-demand gap should narrow from around 20% to about 10% by the end of the year. TrendForce itself expects the severe shortage of global 2.5D packaging capacity to start moderating by 2027, helped by TSMC's plan to expand CoWoS capacity by more than 60% by 2027. Counterpoint Research, per Stocktwits, sees a similar path: a gap near 20% this year, narrowing to roughly 10% in 2027.

Read together, the forecasts point to a shortage that eases largely on Taiwan's capacity, before the New York interposers ramp. The Register added a pointed footnote: Intel Foundry already offers leading-edge process and advanced packaging comparable to CoWoS, so customers need not necessarily wait for TSMC and Amkor.

That is the test for Malta. The plant is a bet that "made in America" will be worth waiting for, by buyers who can currently get chips packaged elsewhere, sooner. If the Arizona assembly lines and the funding both arrive on schedule, the Pacific round trip ends. If either slips, the interposers will be ready, and the chips will still be waiting for a plane.