Micron and SK Hynix just did something remarkable. In the space of 24 hours, both memory-chip makers crossed $1 trillion in market value. It says a lot about where the artificial-intelligence boom has moved next.

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Wall Street reopens today after Memorial Day, and the market is returning to a week that has already started without it. Europe traded while the U.S. and UK were away, and the message from investors was fairly clear: they are worried about the Middle East, but not worried enough to stop buying technology stocks.

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Stocks are moving higher. The Dow is building on Thursday's record close, the S&P 500 is on track for an eighth straight weekly gain: its best run since late 2023. Tech shares are again doing much of the work. Bond yields have eased after a rough stretch. And investors are preparing for a long Memorial Day weekend, which usually encourages a bit of housekeeping, a bit of caution, and a bit of pretending nobody will check their phone on Monday.

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Today's session had briefly looked as if it might build on Wednesday's rebound. Stocks had snapped a three-day losing streak, Europe had rallied sharply, oil had cooled, and Nvidia had done what Nvidia is now expected to do: report numbers so large they make normal corporate earnings look like a neighborhood bake sale. There was also the added excitement of a possible SpaceX IPO, with OpenAI not far behind, giving investors another reason to believe the technology boom still has plenty of fuel. Then Iran re-entered the picture.

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Today's trading session has one obvious main character: Nvidia. The chipmaker reports after the close, and investors are treating the event less like a quarterly update than a market-wide health check, since the company is the clearest symbol of the AI boom. If its results are strong, and its outlook is stronger, it could give stocks the jolt they badly need after three straight tech-led declines.

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What happens when the stocks that carried the rally begin to look expensive at the same time bonds start flashing warning signs? That is the uncomfortable setup facing U.S. equities this Tuesday. The pressure is most visible in chip stocks. Nvidia is down again before the open, on track for a third straight decline, just one day before it reports results. Micron, Seagate, and Western Digital are also sliding after big recent gains. The chip trade has been one of the market's favorite stories this year. But favorite stories can become crowded stories.

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Kevin Warsh is taking over the Fed just as the bond market is sending its first warning. This week, Wall Street gets a clear test: whether AI optimism, Nvidia's results, and a still-resilient consumer can hold up against $110 oil, rising yields, and renewed tension in the Middle East.

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The Trump-Xi meeting was meant to reassure investors, but it fell short. The two leaders talked, and the summit avoided a major blowup, but markets were looking for more than careful staging and diplomatic smiles. They wanted signs that Washington and Beijing could ease pressure on the global economy. Those signs never really came.

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Markets are rallying as Trump meets Xi, lifted by Nvidia, AI optimism, and hopes for a U.S.-China thaw. But Donald Trump goes to China with a weaker hand than he wants to admit…

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April's hotter-than-expected producer inflation has turned this week into a test of whether markets can keep looking past rising prices after yesterday's sharp CPI surprise. With rate-cut hopes fading, oil still tied to the Iran conflict, and Trump heading to Beijing for trade talks with Xi Jinping, investors are facing a less forgiving economic backdrop. Stocks may steady today, helped by a chip rebound and lower oil, but the bigger message is that inflation is back.

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