S&P and Nasdaq hit record highs

U.S. stocks are making new highs again. But this is not one of those moments where every corner of the market is booming together. The real story is narrower and more interesting — semiconductors and AI infrastructure names have become the market’s engine, and they’re strong enough to drag the S&P 500 and Nasdaq to records even while oil, bond yields, and geopolitics stay noisy. ### So what actually pushed the indexes up? The simplest answer is chips. In the first full week of May, the S&P 500 and Nasdaq both closed at record highs as investors piled back into AI-linked names. On May 5, tech led the move. On May 8, the pattern repeated, with Nvidia, Sandisk, and other AI-related stocks helping both indexes notch fresh peaks. Then on May 11, Micron helped lead another record close before some of that move cooled the next day. (finance.yahoo.com) ### Why chips, specifically? Because the market keeps rewarding the companies closest to AI spending. Not “AI” in the vague chatbot sense — the plumbing underneath it. That means GPUs, memory, networking, and the suppliers feeding hyperscaler data-center buildouts. The Philadelphia Semiconductor Index jumped 4.2% to a record high during the rally and was up 55% in 2026 in one market recap, which tells you just how concentrated the leadership has been. (finance.yahoo.com) ### Is this really broad market strength? Not really. The S&P 500 is broad by design, but a cap-weighted index can still be carried by a relatively small group of giant winners. That’s basically what’s happening. The tech-heavy Nasdaq naturally feels this more, but even the S&P has been leaning on a cluster of AI beneficiaries while other sectors lag or move sideways. One recap from May 8 showed the S&P technology index up 2.7% while utilities fell 0.9% — a pretty clean picture of where money wanted to be. (livemint.com) ### Why isn’t oil or inflation killing the rally? Because investors are treating AI capex as the stronger force. The market has had plenty of reasons to wobble — hotter inflation prints earlier in the spring, conflict tied to Iran, and a Treasury market that has not exactly been calm. But traders keep looking through those headwinds when the companies tied to AI demand keep posting strong numbers or strong guidance. That is why the same week could contain geopolitical stress and still end with record closes. (money.usnews.com) ### What changed from earlier in the year? The rally got more confident. By May 8, one market wrap had the S&P up 8% for 2026 and the Nasdaq up 13%, with both indexes on their sixth straight weekly gain. That matters because it says this is no longer just a bounce off a bad patch — it’s a sustained advance, and leadership has stayed remarkably consistent. (money.usnews.com) ### What’s the catch? Concentration. When one theme does this much work, the market gets more vulnerable to any disappointment in that theme. Micron’s sharp reversal on May 12 after helping drive records on May 11 was a small reminder. If AI spending keeps accelerating, the rally can keep stretching. But if earnings, guidance, or capex plans wobble, the same narrow leadership can turn into a weak spot fast. (money.usnews.com) ### Why should a normal investor care? Because record highs can look healthier than they really are. The headline says “the market is strong.” The internals say “a few very specific businesses are extremely strong.” Those are not the same thing, and they lead to different risks. (cnbc.com) ### Bottom line? The records are real. But the message underneath them is even more important: Wall Street is still willing to overlook a messy macro backdrop if a company sits close enough to the AI spending firehose. (finance.yahoo.com) (livemint.com)