Micron raised its US investment by $50B and the stock surged 8%, its already up by 200% this year. Justified capex or overreach

Micron announced today it's boosting its planned U.S. investment to more than $250 billion through 2035, up from $200 billion committed just last June, which itself had already been up from an original lower figure. The stock jumped about 8% on the news, adding to a run that's already put Micron up over 200% year-to-date, and the move dragged the rest of the chip-equipment and memory space higher with it.

The announcement is tied to a real, physical milestone. Micron poured the first concrete foundation at its New York semiconductor campus today, more than a full quarter ahead of the original schedule, and officials are calling it what will become the largest semiconductor manufacturing site in U.S. history. The expanded investment across New York, Idaho, and Virginia is expected to create more than 90,000 jobs, and Micron says the goal is to eventually produce 40% of its DRAM domestically within a decade.

There's also a smaller supply chain piece worth knowing about. Micron's putting up to $3 billion into strengthening its U.S. supply chain, including $500 million to help GlobalWafers expand a Texas facility that makes the raw silicon wafers Micron's fabs actually need to operate, along with a 10-year deal to lock in supply from them. So Micron isn't just building fabs, it's also working to secure the upstream inputs those fabs depend on at the same time."

On the fundamentals side, the numbers backing this expansion are genuinely strong. Micron's cash and marketable investments have grown from about $12 billion a year ago to over $30 billion now, and its Cloud Memory business unit specifically saw revenue jump from $3.4 billion a year ago to $13.8 billion this quarter, with operating margin climbing from 46% to 78% over that same stretch. That's the kind of margin expansion that can justify this boost in the planned spending.

The obvious question hanging over all of this is timing. Micron's own fab timeline stretches out to mid-2027 for first wafer output in Idaho and late 2028 for the second Idaho fab, meaning a huge chunk of this capacity doesn't even come online for another 2-3 years. That's a long time for the current AI-driven memory pricing to hold and history (2018's memory cycle) is a reminder that pricing environments this strong don't always last as long as the capex plans built around them.

Does locking in a decade-long, $250 billion domestic buildout look like smart, disciplined reinvestment of genuinely strong current margins, or does committing this much capital this far out feel risky given the past.