Micron shares rose sharply after it announced new investment to strengthen the U.S. semiconductor supply chain. The stock started the session up about 5 percent and extended gains in trading. It closed at $1,023.79, up 7.90 percent from the previous close of $948.80, regaining the $1,000 level.

On July 9, CNBC reported that Micron will make up to $3 billion in new strategic investments to strengthen the U.S. semiconductor supply chain and will also expand its U.S. investment plan through 2035.

The key to the investment is not only expanding production facilities but also securing a more stable U.S.-based sourcing network for raw materials. The new investment includes $500 million in support for Taiwan-based GlobalWafers to expand wafer development and production at its Texas facility. Micron also signed a 10-year supply agreement to secure volumes of silicon wafers, a raw material.

Ben Tessone (벤 테소네), Micron’s chief procurement officer, said in a press release, "Securing a stable supply of critical input materials is essential to supporting Micron’s long-term growth and technology roadmap."

In a separate announcement, Micron also increased the size of its U.S. investment. It said it will invest $250 billion in the United States through 2035, about $50 billion more than its existing plan. It cited rapidly rising memory demand driven by the expansion of artificial intelligence infrastructure as the reason for the increase.

Markets reacted immediately. Semiconductor-related stocks including Applied Materials, KLA, Lam Research and Arm Holdings also rose on the day.

Micron shares have surged nearly 250 percent so far in 2026, and in May it surpassed a $1 trillion market capitalisation for the first time. As demand for memory used in AI computing surges, Micron is pursuing new and expanded facilities in several U.S. cities at the same time. Construction is under way on 2 new fabs in Boise, Idaho, where it is headquartered, and on July 9 the first concrete was poured at a new fab in Clay, New York. Micron said the New York facility, once completed, will be the largest semiconductor manufacturing facility ever built in the United States.

The announcement also reflects an industry view that expanding production in the United States alone is not enough. Without a stable supply of basic materials such as wafers, the impact of expanding memory output could be limited. Micron stressed that it had also secured a 10-year supply agreement, laying the groundwork for long-term procurement.

Key points to watch going forward are the pace of Micron’s investment execution and the degree of supply-chain internalisation. The $250 billion plan is based on the assumption that AI memory demand will persist over the long term. The next focus is expected to be whether expanded U.S. production and materials supply agreements translate into real increases in supply capacity, and how long benefits for semiconductor equipment stocks and related supply-chain companies will last.