U.S. business activity accelerated sharply in September while price pressures intensified, forcing bond investors to reassess how much additional Federal Reserve tightening may still be ahead.
Wednesday delivered exactly the type of economic data the Treasury market did not want to see: stronger growth, firmer employment and renewed inflation pressure arriving simultaneously. The September S&P Global Flash U.S. Composite PMI jumped to 58.4 from 56.0 in August, marking the strongest expansion in U.S. private-sector activity since July 2021. S&P Global said the survey was consistent with roughly 4% annualized growth during the third quarter, with September alone pointing toward an even faster pace.
Just as importantly for fixed-income investors, the strength was broad. Service-sector activity accelerated sharply while manufacturing growth improved to one of its strongest rates since the pandemic. Companies also increased employment at the fastest pace in more than four years as businesses responded to rising demand. That combination would normally be encouraging for the economic outlook. For the bond market, however, the inflation details were considerably less friendly.
Growth Is Accelerating — and So Are Costs
S&P Global reported that business input costs increased at the fastest rate in nearly four years during September, driven in part by higher fuel and transportation expenses. Supply-chain pressures also intensified, with supplier delivery delays becoming the most widespread since July 2022 and backlogs accumulating rapidly. Selling-price inflation increased as well. S&P Global noted that while competitive pressures limited some of those increases, particularly in services, the overall pace remained well above levels historically consistent with the Federal Reserve’s 2% inflation target. That is the uncomfortable part of Wednesday’s report.
The economy isn’t simply proving resilient in the face of higher borrowing costs. According to the PMI data, activity may actually be accelerating at the same time that higher energy prices and capacity constraints are adding fresh inflation pressure. S&P Global’s combined indicator of output, employment and costs consequently rose to its highest level since June 2022 — a configuration the firm characterized as firmly within rate-hike territory. For Treasury investors, that substantially raises the hurdle for yields to decline sustainably. A meaningful bond rally increasingly requires either a clear deterioration in labor-market activity, renewed disinflation, lower energy prices or some combination of the three.
Treasuries Reprice the Growth-and-Inflation Mix
The market reaction was swift. Treasury yields surged Wednesday, with the two-year yield posting its largest daily rise since April 2025 and reaching its highest level since May 2024. By early Thursday trading, the benchmark 10-year Treasury yield had reached 5.145%, a new post-global-financial-crisis high. Reuters described Wednesday’s move as part of the sharpest selloff across U.S. Treasuries and other major government-bond markets since last year’s tariff-related market turmoil.
The shift wasn’t limited to Treasury yields. The dollar climbed to approximately a two-month high as higher U.S. yields increased the relative appeal of dollar-denominated assets. Markets also raised the probability assigned to another Federal Reserve rate increase at the October meeting to nearly 70%, according to CME FedWatch data cited by Reuters, up from around 50% a week earlier.
For the yield curve, the immediate pressure is coming from two directions. Stronger economic data push up expectations for the policy-rate path at the front end, while stubborn inflation, large Treasury financing requirements and elevated uncertainty around energy prices continue to pressure term yields farther out. That makes the current environment particularly difficult for long-duration bonds. Duration can eventually become attractive when yields rise far enough, but the catalyst for extending aggressively remains less obvious while both economic momentum and inflation indicators are moving higher.
Housing Is Already Feeling the Rate Shock
Wednesday’s other notable U.S. release provided a reminder that higher rates are not harmless. The Mortgage Bankers Association reported that mortgage applications declined 1.5% in the week ended September 18. Purchase applications fell 1%, while refinancing activity dropped 3%. Refinancing applications are now 62% below their year-earlier level. The bigger story was mortgage rates. The average 30-year conforming mortgage rate rose to 7.12% from 6.97%, its highest level since May 2024. Adjustable-rate mortgages consequently increased to 9.8% of total applications as borrowers searched for cheaper financing alternatives.
The mortgage data illustrate the transmission mechanism through which today’s higher Treasury yields eventually restrain the economy. Housing affordability deteriorates, refinancing disappears, consumer cash-flow relief becomes harder to obtain and residential investment faces additional pressure. For agency mortgage-backed securities, however, rising mortgage rates also reduce refinancing incentives and extend expected mortgage duration. That extension risk can amplify weakness when Treasury yields are already rising, particularly during abrupt long-end selloffs.
The Hawkish Message Was Global
The U.S. was not alone. The eurozone’s September Composite PMI rose to 53.1 from 52.0, its strongest reading in almost three-and-a-half years. S&P Global said the survey was consistent with approximately 0.4% quarterly GDP growth. Manufacturing strengthened, led by Germany, while France returned to expansion for the first time in ten months. But inflation pressures increased there as well. Eurozone input costs and selling prices rose at their fastest rates in four months, with higher energy prices again playing a central role.
The UK offered a somewhat different mix. Its Composite PMI slipped to 51.7 from 52.5, pointing to sluggish growth, while selling-price inflation accelerated. That combination leaves the Bank of England confronting weaker activity without much immediate relief on inflation.
The broader message for global fixed income is therefore becoming difficult to ignore: the energy shock is interacting with economies that, in several important regions, are proving more resilient than expected. That is not a particularly bond-friendly combination.
What Fixed-Income Investors Should Watch Next
Thursday’s U.S. calendar shifts attention toward the labor market and housing. Initial unemployment claims are expected around 201,000, versus 196,000 previously, while August new-home sales are expected near 615,000 units after 607,000 in July. Several Federal Reserve officials are also scheduled to speak. Jobless claims may now carry greater market significance than usual. Wednesday’s PMI indicated the strongest employment growth in more than four years. If weekly claims remain near recent lows, investors will have another reason to question whether policy is restrictive enough to generate meaningful labor-market cooling.
New-home sales will offer the other side of that story. Mortgage rates above 7% are clearly tightening financial conditions, and weaker housing data would provide some evidence that higher yields are beginning to bite.
For credit markets, resilient economic growth remains fundamentally supportive of corporate cash flows and near-term default risk. That argues against treating Wednesday’s rate selloff as an outright deterioration in credit fundamentals. The challenge is valuation: higher risk-free yields increase financing costs and raise the return hurdle for owning spread product. Investment-grade credit can therefore remain fundamentally sound even while total returns struggle because of duration. High yield carries less interest-rate sensitivity but becomes more vulnerable if today’s inflation-driven tightening eventually produces a sharper growth slowdown.
The near-term fixed-income debate has consequently shifted. The question is no longer simply whether inflation will eventually cool enough to allow lower rates. Investors now have to consider whether growth is strong enough — and energy-driven inflation persistent enough — to keep the tightening cycle alive longer than markets had expected. Wednesday’s data moved that risk meaningfully higher.
Sources
- S&P Global Market Intelligence, US Flash PMI Signals Fastest Growth for Over Five Years in September, September 23, 2026.
- Mortgage Bankers Association, Mortgage Applications Decrease in Latest MBA Weekly Survey, September 23, 2026.
- S&P Global Market Intelligence, Eurozone Growth Hits Highest Since April 2023 According to Flash PMI, September 23, 2026.
- S&P Global Market Intelligence, UK Flash PMI Signals Slower Growth and Rising Inflation in September, September 23, 2026.
- Federal Reserve Bank of New York, September 2026 U.S. Economic Indicators Calendar.
- Reuters, Bond Market Selloff Rumbles On Ahead of Trump and Xi Talks, September 24, 2026.
- Reuters, Dollar Hovers Near Two-Month Peak as Markets Assess U.S. Rate Outlook, September 24, 2026.
Disclaimer: This article is for informational and educational purposes only and does not constitute investment advice, an offer to buy or sell securities, or a recommendation of any investment strategy. Fixed-income securities are subject to interest-rate, credit, liquidity and market risks. Investors should consider their objectives, risk tolerance and circumstances before investing.
