GlobalFoundries (GFS) stock jumps on a $2 billion, five-year deal to make silicon interposers for TSMC, October 8, 2026

GlobalFoundries shares rose on Thursday, October 8, 2026 after the company said it will make silicon interposers for TSMC at its fab in Malta, New York, under a five-year agreement that Reuters valued at $2 billion. The first headline reached the MoveSurge news feed at 08:10:42 ET, before the open, and GFS went from $47.01 to $50.43 in the next minute, a 7.28% jump in thin premarket trading. At 09:59 ET the stock was at $49.94, up 3.89% on the day, while TSMC's US-listed shares were down 1.11%.

An interposer is a slab of silicon that sits beneath an AI processor and its memory chips inside an advanced package and carries the dense wiring that lets them exchange data at high speed. GlobalFoundries says Malta will be the first US-based source of interposers for TSMC's CoWoS packaging, with volume production ramping in the first half of 2028 and a framework in the agreement for adding capacity after the initial term.

How GFS traded around the headline

The chart starts from the last premarket trade before the first headline, $47.01, which was already below Wednesday's close, so the premarket readings run larger than the regular-session change. The regular-session figure is measured from that close and is the cleaner one to compare with other days.

TSMC's US shares hardly reacted. They went from $465.20 to $465.60 in the minute after the 08:11:12 ET version of the story, a 0.09% change, which fits a contract that is large for GlobalFoundries and small for TSMC.

What $2 billion means at GlobalFoundries' size

GlobalFoundries reported revenue of $6.791 billion for 2025. Spread evenly over five years, $2 billion would come to $400 million a year, or about 5.9% of that total. Volume production does not start until the first half of 2028, though, and neither company has said how the money is spread across the term.

The agreement also gives GlobalFoundries a route into the most advanced AI hardware without competing at the leading edge, a race it left in 2018 when it halted 7-nanometre development. An interposer is patterned with far coarser features than the processor that sits on it, which suits a foundry built around mature processes, and the release also mentions embedded deep trench capacitors, components that help steady the power supplied to the chips above.

From patent fight to supply contract

Seven years ago the two companies were suing each other in three countries.

1. August 2019: GlobalFoundries sues TSMC in the US and Germany, alleging infringement of 16 patents.
2. September 30, 2019: TSMC files its own suits in the US, Germany and Singapore over at least 25 patents covering GlobalFoundries' 40nm, 28nm, 14nm and 12nm processes.
3. October 28, 2019: the companies settle with a life-of-patents cross-license of their worldwide patents, including any filed over the following ten years.
4. October 8, 2026: GlobalFoundries agrees to make silicon interposers for TSMC in Malta, New York.

Why TSMC wants a second source

TSMC's CoWoS capacity is expected to rise from about 130,000 wafers a month at the end of 2026 to about 260,000 by the end of 2028, according to supply-chain estimates TrendForce reported on September 14, with the expansion centred on the AP7 site in Taiwan and the Arizona campus. Each CoWoS package is built on an interposer, so doubling packaging output means doubling the supply of interposers too, and Malta's ramp in the first half of 2028 lands inside that build-out.

For comparison, the last GlobalFoundries partnership headline MoveSurge measured, Navitas moving production of its GaN power chips to GlobalFoundries' Vermont fab on September 1, took GFS from $43.74 to $43.80 in a minute, a 0.14% change.