Micron's 7% Drop Deepens Chip Rout as S&P 500 Snaps Three-Week Win Streak

Micron Technology dropped 7% in Friday's session, the sharpest single-stock move in a semiconductor sell-off broad enough to pull the S&P 500 lower and snap the index's three-week winning streak. The decline set up next week's Nvidia earnings report as the event markets are now treating as the decisive test of the AI trade. The proximate driver was a capex math problem. New figures showed hyperscalers — the large cloud companies building AI data centers — are now spending 102% of their cloud revenue on AI capital expenditure, meaning the buildout is running ahead of what the cloud business itself earns and has to be funded from elsewhere. Deutsche Bank flagged what it called "near-perfect" pricing across markets, and Warren Buffett added his own warning, and both fed into pressure on chip and hardware names most exposed to that spending. Micron was the largest mover, but Nvidia's results next week are what the market is treating as the number that either confirms or unwinds the overhang. A second pressure came from insider selling. CoreWeave's entire executive suite sold stock this week, five separate executives in rapid succession; SOLV Energy's private-equity owner cashed out $220.5 million in stock; three senior Ethos Technologies executives sold within days of each other. Across six companies tracked, only one insider was a net buyer. Not all of it read as bearish: Tempus AI insiders sold stock just before a rally in the shares, but the underlying filings pointed to routine tax-related mechanics rather than a signal about the company's prospects — a distinction that matters because headline insider-selling totals, on their own, do not explain why executives sold. Rates added a third layer of risk. Treasury yields rose while margin debt — money investors borrow against their portfolios to buy more stock — sat at record levels, with the S&P 500 still trading near its highs. That combination raises the odds of a sharper move if yields climb further, since leveraged positions get harder to hold as borrowing costs rise. The Treasury's own bond-buying push complicated matters for Fed Chair Kevin Warsh, and President Trump said he had not directed Treasury Secretary Scott Bessent to intervene in the bond market, even as reporting described Bessent applying a hedge-fund-style approach to Treasury debt management that the bond market was resisting. Trade policy stayed unresolved too. Canadian Prime Minister Mark Carney declared Canada "at war" with the US after tariff talks collapsed, even as separate reporting said US and Canadian officials were still seeking an agreement to avert 50% tariffs on imports — two accounts that cannot both be the final word, and the next round of talks should clarify which one holds. Oil traders had their own open question: flows through the Strait of Hormuz stalled as the US and Iran traded fresh sanctions threats, a chokepoint risk that eases or escalates depending on decisions neither market can price in advance. On the data side, flash PMI readings — surveys of purchasing managers that gauge whether factory and services activity is expanding — showed the US, UK and eurozone all growing faster with inflation cooling, a genuinely positive combination that got little attention against the chip sell-off. The Buy List 2026 model portfolio, built on €110,000 invested, closed the session valued at €116,199, a total return of 5.64% including dividends against 5.16% on price alone — the gap showing dividend income doing some of the work. The split inside the portfolio captured the day's story: ASML, the Dutch lithography maker most exposed to the chip cycle, held almost flat at +0.47% even as Micron fell 7% elsewhere in the sector, while Maersk (+26.16%) and MicroStrategy (+21.43%) carried the portfolio's gains and Vonovia (-16.63%) and Tesla (-9.97%) remained its biggest drags. Nothing in the portfolio moved sharply enough today to change that balance; Nvidia's earnings next week are the next event that could.