The 10 year wafer deal and prepayment make Micron the underwriter of new U.S. chipmaking capacity, echoing prepaid contracts that turned into liabilities after the 2018 memory downturn.
Micron is putting $500 million of strategic financing into GlobalWafers' Sherman, Texas plant and has signed a 10-year agreement to take wafers from the site, the chipmaker said Thursday. The transaction moves the capital bill for new wafer capacity from the supplier to the chip customer. Raw silicon wafers are the disc-shaped substrate every advanced DRAM, NAND, and logic die is built on, and Sherman is described as the only currently operating U.S. facility producing the 300 mm version that leading-edge fabs require.
The package also answers the conditions GlobalWafers chairperson and CEO Doris Hsu set publicly when the 142-acre plant opened in May 2025. Hsu said expansion would depend on the first two phases reaching profitability, long-term contracts at reasonable prices, customer prepayments, and continued government support. The Micron deal meets three of those four in a single transaction: a 10-year offtake, the $500 million prepayment, and the existing $406 million CHIPS Act award that GlobalWafers had already secured for Sherman and a sister silicon-on-insulator facility in St. Peters, Missouri.
Wafer suppliers ran their lines flat through the 2023-2024 memory downcycle to protect margins rather than add capacity, and the capital bill for the next U.S. phases now lands on the shoulders of their biggest customers. Micron is betting $3 billion in total on the U.S. supply chain, with the GlobalWafers piece the most concrete piece of it, and the company separately raised its planned U.S. spending to more than $250 billion through 2035, up from the prior $200 billion figure. The first concrete pour at Micron's Clay, New York fabrication campus also came in more than a quarter ahead of schedule, a separate signal that the company's domestic ramp is moving faster than its original timeline.
During the 2017-2018 memory megacycle, chipmakers signed prepaid long-term wafer agreements that locked in capacity and prices at the top of the market. When pricing rolled over in 2019, those contracts turned into liabilities: customers had committed to pay for wafers they no longer needed at rates far above the new spot price. The exact terms of Micron's prepayment are not public, but the same risk applies if DRAM and NAND prices fall before the second Sherman phase comes online. Market reaction was modest. Micron shares rose roughly 5% on the day of the announcement.
The transaction does not, on its own, change who controls the global 300 mm wafer market. Shin-Etsu, SUMCO, GlobalWafers, Siltronic, and SK Siltron still account for the overwhelming majority of production, and Micron's other U.S. fabs will continue to pull wafers from Japan, Taiwan, Germany, and South Korea. Sherman's planned six-phase buildout is incremental against that base, even with GlobalWafers' separate $4 billion U.S. spending commitment.
Reshoring of the most concentrated layer of the chip stack is no longer waiting on appropriations or CHIPS Act milestones alone. It is moving on customer prepayments, with the capital risk shifted to the buyers who need the wafers.
The next milestone to watch is whether other major chip customers follow Micron into prepaid offtakes at the second Sherman phase, or whether Sherman's profitability and customer demand actually arrive as GlobalWafers' 2025 conditions assumed.