Treasury Yields Hit Multi-Decade Highs – but AI Led Stocks Higher Anyway
This week delivered an unusual combination: bond markets under significant stress, and equity markets posting their best weekly gain in months.
The 10-year Treasury yield climbed to 5.217% – its highest level since 2007 – while the 30-year yield reached its highest point since 2004. The ICE BofA MOVE Index, which measures volatility in the U.S. bond market, surged nearly 30% during the week alone, rising to levels last seen when the current Middle East conflict began. That kind of movement in rates would historically signal caution for equities. And yet, the S&P 500 gained +1.22% for the week, snapping a two-week losing streak, the Nasdaq rose +2.06%, and the Dow ended +0.28%, ending its own three-week skid.
What We Observed This Week
We observed a market navigating two competing forces – and, for the moment, the bulls had the edge.
On the inflation and rates side, the picture continued to tighten. Last week’s Federal Reserve rate hike to 3.75%-4.00% – the first since 2023 – raised the stakes for every subsequent data point. This week, Fed speakers reinforced the message. Cleveland Fed President Beth Hammack noted that the rise in yields reflected real rates moving higher alongside a solid economic outlook, attributing the surge in part to competition for investor cash driven by strong technology-sector investment. Kansas City Fed President Jeff Schmid raised an unusual note of caution about the growing AI and data-center investment cycle, suggesting the Fed may need to assess whether it is creating systemic risk – drawing an explicit parallel to the “too-big-to-fail” dynamics that required public intervention during the 2007-2009 financial crisis. October rate-hike odds climbed above 75% by week’s end, up from approximately 49% the prior week. The August PCE inflation report – the Fed’s preferred inflation gauge – is due September 30, and will carry significant weight for the November meeting.
On the growth and innovation side, artificial intelligence continued to supply the narrative that kept equity investors engaged. Microsoft rose approximately 3% after unveiling new Copilot AI capabilities. Akamai Technologies surged 12% after announcing an $11.6 billion cloud-services deal with Anthropic. Meta shares extended their September rally, rising 36% month-to-date on continued enthusiasm around its Muse personal AI assistant – bringing the company within reach of a $2 trillion market valuation. The technology and AI-infrastructure complex provided the lift that overcame persistent pressure from rising yields.
Geopolitics also played a meaningful role. Reports that U.S. and Iranian negotiators were exploring a phased path toward reopening the Strait of Hormuz – including potential relief from the U.S. economic blockade – helped ease oil prices from recent highs. Brent crude settled at $98.52 on Friday, down from above $100 earlier in the week, providing some relief from the inflation premium that elevated oil prices had been embedding into rate expectations.
What We Are Watching
We are watching Tuesday’s PCE report closely. With the fed funds rate now at 4% and the dot plot signaling more to come, the August inflation reading could either reinforce or complicate the case for an October hike. We are also watching the 10-year Treasury yield – at levels not seen since 2007, it is beginning to affect borrowing costs across the economy in ways that could increasingly show up in consumer and business spending data.
For long-term investors, the key observation from this week is that two very different stories are running simultaneously. The bond market is pricing in a prolonged inflation fight. The equity market – at least the technology-focused segment – is pricing in a transformational growth cycle driven by artificial intelligence. How those two stories ultimately interact will be a defining feature of the investment environment in the months ahead.
Disclaimer: This content is for educational purposes only and does not constitute personalized investment advice or a recommendation to buy or sell any security. The information provided reflects general market commentary based on publicly available information and is not tailored to the financial situation of any individual. Investing involves risk, including the possible loss of principal. Past market performance is not indicative of future results. Guardant Wealth Advisors, LLC is a registered investment adviser. Registration does not imply a certain level of skill or training.
Weekly Market Commentary: September 21 – 25, 2026
Treasury Yields Hit Multi-Decade Highs – but AI Led Stocks Higher Anyway
This week delivered an unusual combination: bond markets under significant stress, and equity markets posting their best weekly gain in months.
The 10-year Treasury yield climbed to 5.217% – its highest level since 2007 – while the 30-year yield reached its highest point since 2004. The ICE BofA MOVE Index, which measures volatility in the U.S. bond market, surged nearly 30% during the week alone, rising to levels last seen when the current Middle East conflict began. That kind of movement in rates would historically signal caution for equities. And yet, the S&P 500 gained +1.22% for the week, snapping a two-week losing streak, the Nasdaq rose +2.06%, and the Dow ended +0.28%, ending its own three-week skid.
What We Observed This Week
We observed a market navigating two competing forces – and, for the moment, the bulls had the edge.
On the inflation and rates side, the picture continued to tighten. Last week’s Federal Reserve rate hike to 3.75%-4.00% – the first since 2023 – raised the stakes for every subsequent data point. This week, Fed speakers reinforced the message. Cleveland Fed President Beth Hammack noted that the rise in yields reflected real rates moving higher alongside a solid economic outlook, attributing the surge in part to competition for investor cash driven by strong technology-sector investment. Kansas City Fed President Jeff Schmid raised an unusual note of caution about the growing AI and data-center investment cycle, suggesting the Fed may need to assess whether it is creating systemic risk – drawing an explicit parallel to the “too-big-to-fail” dynamics that required public intervention during the 2007-2009 financial crisis. October rate-hike odds climbed above 75% by week’s end, up from approximately 49% the prior week. The August PCE inflation report – the Fed’s preferred inflation gauge – is due September 30, and will carry significant weight for the November meeting.
On the growth and innovation side, artificial intelligence continued to supply the narrative that kept equity investors engaged. Microsoft rose approximately 3% after unveiling new Copilot AI capabilities. Akamai Technologies surged 12% after announcing an $11.6 billion cloud-services deal with Anthropic. Meta shares extended their September rally, rising 36% month-to-date on continued enthusiasm around its Muse personal AI assistant – bringing the company within reach of a $2 trillion market valuation. The technology and AI-infrastructure complex provided the lift that overcame persistent pressure from rising yields.
Geopolitics also played a meaningful role. Reports that U.S. and Iranian negotiators were exploring a phased path toward reopening the Strait of Hormuz – including potential relief from the U.S. economic blockade – helped ease oil prices from recent highs. Brent crude settled at $98.52 on Friday, down from above $100 earlier in the week, providing some relief from the inflation premium that elevated oil prices had been embedding into rate expectations.
What We Are Watching
We are watching Tuesday’s PCE report closely. With the fed funds rate now at 4% and the dot plot signaling more to come, the August inflation reading could either reinforce or complicate the case for an October hike. We are also watching the 10-year Treasury yield – at levels not seen since 2007, it is beginning to affect borrowing costs across the economy in ways that could increasingly show up in consumer and business spending data.
For long-term investors, the key observation from this week is that two very different stories are running simultaneously. The bond market is pricing in a prolonged inflation fight. The equity market – at least the technology-focused segment – is pricing in a transformational growth cycle driven by artificial intelligence. How those two stories ultimately interact will be a defining feature of the investment environment in the months ahead.
Disclaimer: This content is for educational purposes only and does not constitute personalized investment advice or a recommendation to buy or sell any security. The information provided reflects general market commentary based on publicly available information and is not tailored to the financial situation of any individual. Investing involves risk, including the possible loss of principal. Past market performance is not indicative of future results. Guardant Wealth Advisors, LLC is a registered investment adviser. Registration does not imply a certain level of skill or training.
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Student of the Market: September 2026
Special Market Commentary – September 13th, 2026
Weekly Market Commentary: September 8 – 11, 2026