US Markets Overnight: The bond market crashed the chip party

US markets overnight were rough. It was always going to come for them, the only question was when. After weeks of US markets grinding higher on the back of a parabolic AI chip rally, Friday May 15 was the session where the bond vigilantes finally turned up at the door with a clipboard. The 10-year Treasury yield punched through 4.5% and kept going, hot inflation prints from earlier in the week landed like a delayed slap, and traders did what traders always do when bond yields go vertical, they reached for the eject button on anything that ran too far, too fast. The S&P 500 and Nasdaq closed at record highs on Thursday, and by Friday’s close they were a smouldering ruin, dragged down by the same chip names that had been carrying the whole rally on their shoulders all month.

The scoreboard, in shades of red

The S&P 500 shed 1.2% to 7,408.50, the Nasdaq Composite gave back 1.5% to 26,225.14, and the Dow Jones Industrial Average dropped 537 points, or 1.1%, to 49,526.17, slipping back below 50,000 less than 24 hours after first clearing it. The Russell 2000 took the worst of it among the majors, falling around 2.0%, because small caps and rising yields go together like cordial and vinegar. WTI crude punched above US$103 and Brent settled around US$109 a barrel after another 3% surge, with the Strait of Hormuz still effectively shut and Trump publicly running out of patience with Tehran.

Gold cooled to roughly US$4,548 an ounce after a brutal Thursday, Bitcoin slipped back into the low US$80,000s, the US Dollar Index nudged up to 99.05, and the VIX, which had been napping all month, finally stirred toward 19. But the real action was in the bond pits, where the US 10-year Treasury yield jumped 14 basis points to 4.60%, the highest in nearly a year, and the 2-year added almost 9 basis points to 4.08%. That, in short, is what broke the spell. This was the kind of US markets overnight session where you don’t need to look at the chart, you can feel it in the spread.

Mag 7: the Ackman pivot

The Mag 7 didn’t get carved up evenly on Friday, and the catalyst was a 13F filing. Microsoft was the clear standout, rallying 3.0% to US$421.92 after Bill Ackman’s Pershing Square disclosed it had built a new core position in MSFT while completely exiting its long-running Alphabet stake. That’s a pretty handy way to end a week for the 2026 mega-cap laggard, and it gave Microsoft shareholders something to talk about for the first time in months.

The flipside, predictably, was Alphabet, which slipped 1.0% to US$393.32 as the Ackman exit news did the rounds. Tesla took the worst Mag 7 beating, off 4.8% to US$422.22, after Elon Musk’s Beijing field trip with Donald Trump came home without the China Full Self-Driving approval the Tesla bull case has been leaning on for two years. Nvidia slid 4.4% to US$225.32, a mix of plain old profit-taking ahead of its May 20 earnings print and the broader chip de-grossing that defined the session. Amazon faded 1.2% to US$264.14, Meta gave back a token 0.7% to US$614.23, and Apple was the only other green print of the seven, edging 0.7% higher to US$300.23 and quietly going about its business while the rest of the room argued about yields.

For background on why the chip-leveraged names have started cracking, Stocks Down Under’s earlier note on why Qualcomm, Nvidia and Micron shares fell sets the scene nicely.

Chip check: the hangover hits the foundry

If you wanted to see what a “rotation” looks like in real time, the SOX gave you a textbook lesson, plunging close to 6% intraday before partially clawing some of it back. Intel, the most unlikely runaway leader of 2026 with shares up 214% year to date through Thursday’s close, slumped 7% to around US$108 as fast money cashed in two months of gains in a single afternoon. AMD, which has more than doubled this year, dropped almost 6% to about US$424. Micron got smoked 6.6% to US$724.66, Marvell fell 3% to around US$177, ASML sank more than 5%, and Broadcom and TSMC were dragged along for the ride.

Even Qualcomm, which had its own AI-related glow-up earlier in the month, struggled to hold its gains. The catalyst was less about anything stock-specific and more about positioning, because when names have run 80% to 200% in weeks and the discount rate suddenly moves against you, the de-grossing happens fast and indiscriminately. The market read on Friday’s chip selloff was pre-Nvidia derisking and profit-taking, not a thesis change, but the price action doesn’t really care about your nuance when the tape goes one way.

One thing worth watching

Nvidia reports fiscal Q1 2027 after the bell on Tuesday May 20, which is now the single biggest event on the calendar for both the AI complex and the broader US markets overnight. Polymarket has the beat priced at a 95% probability, which is fine, except that the Nvidia setup for six straight quarters has been “you have to beat or you go down”.

With the SOX coming off a near 4% drubbing and the bond market still very much awake, any wobble in either the guide or the China commentary could turn next Wednesday’s open into a continuation of Friday’s air pocket rather than the relief rally the bulls are quietly counting on.

Australian investors should also keep half an eye on oil into Monday morning here, because if Brent keeps pushing toward US$115 a barrel, the bond market’s inflation tantrum has a lot more room to run, and that means Friday’s session was a warning shot, not the end of it.