The US 10-year Treasury yield climbed to roughly 5.2% on September 24, a level not seen in decades. Conventional market logic suggests such a spike should compress valuations across richly priced technology stocks. Instead, the Magnificent Seven have continued their upward march, decoupling from a bond market that keeps repricing higher.
The immediate catalyst was viral consumer adoption of Meta's new AI assistant, Muse, which triggered a sector-wide buying wave on September 21. Meta's share price jumped more than 11% that day, its best single-day performance since April 2025, reversing a sharp selloff from the prior week that had been fueled by sober commentary from AI executives.
What changed was Muse's rapid consumer uptake, giving analysts concrete evidence that hyperscaler infrastructure spending is starting to generate revenue, not just cost. The surge spilled across the semiconductor chain: AMD crossed a $1 trillion market cap for the first time, capping a 185% year-to-date gain; Intel rose 12%; Arm added 17%. The Nasdaq Composite closed at a record high, up more than 2% on the day.
Rates above 5% change the math for any company that depends on borrowed money. Highly levered or unprofitable software firms face real refinancing risk in this environment. The Magnificent Seven largely do not. Generating hundreds of billions of dollars in free cash flow each year, they fund their AI infrastructure buildouts internally rather than tapping credit markets already pricing in tighter policy. Scale also brings pricing power, which protects margins as costs climb industry-wide.
The result is a bifurcated market: capital keeps flowing into the handful of companies that can self-fund growth, while it drains from anything still reliant on cheap debt to expand. That divide explains why megacap technology and multi-decade Treasury yields can climb in tandem without contradiction.
The exuberance proved short-lived. Treasury yields spiked back toward multi-decade highs around September 23, as hotter-than-expected business-activity data, crude oil breaking back above $100 a barrel, and rising odds of an October Fed hike revived rate anxiety. The Nasdaq Composite slipped roughly 1% that session, and the S&P 500 fell more than half a percent, as the rally in chipmakers stalled almost as quickly as it began.
Capital rotated into a different corner of technology instead: cybersecurity providers CrowdStrike and Palo Alto Networks led gainers. That pivot is telling. Investors are not abandoning caution about rates so much as concentrating capital in the handful of business models resilient enough to withstand them — AI infrastructure one week, defensive software the next.
This article is for informational purposes only and does not constitute financial advice.
