The 10-year Treasury yield reached a high of about 5.2% on September 24, a multi-decade high that should, by conventional logic, compress valuations across richly priced technology stocks.
Instead, the Magnificent Seven stocks have kept climbing – decoupling from a bond market that continues to reprice higher.
The immediate spark was viral consumer adoption of Meta’s new AI assistant, Muse, which triggered a sector-wide buying wave on September 21.
Beneath that single catalyst sits a broader shift: institutional investors are increasingly treating the market’s largest technology companies as cash-flow havens, uniquely equipped to absorb elevated capital costs that smaller, debt-reliant growth firms cannot.
Proof of AI return on investment
Meta’s (META) share price jumped more than 11% on September 21 — its best single-day performance since the market turmoil of April 2025.
The rally reversed a sharp selloff from the previous week, triggered by unusually sober commentary from artificial intelligence executives.
What changed was Muse, Meta’s new AI assistant: launched two weeks earlier, its rapid consumer adoption gave analysts something concrete to point to — proof 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 an 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.
Balance sheet as shields
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 stocks largely don’t.
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.
A narrow market advance
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.