The 10-year Treasury yield spike to 5.10% this morning (the highest since June 2007) is being read almost universally as a kneejerk reaction to a hot PMI print. The data underneath that print suggests the problem is less about one morning’s spook and more about an inflation dynamic that has been building quietly for months.
What the PMI Actually Said
The S&P US Composite Flash PMI is the proximate trigger, and it is worth reading carefully rather than summarising away. S&P Global put the Flash US Composite Output Index at 54.4 for September, marginally below August’s 54.6 but still firmly expansionary. The headline number, in other words, barely moved. What moved was everything underneath it.
Output is growing at the fastest rate for over five years. S&P Global’s own PMI release describes annualised growth of around 5%, with a 4% gain signalled for the third quarter as a whole. Supply chain bottlenecks are described as among the most severe in the near-two-decade survey history if the pandemic is excluded. Backlogs of work are rising sharply. Firms’ input costs jumped in September at the steepest rate for four years, driven in part by fuel and transport costs linked to rising oil prices.
Then there is the inflation reading that is not in most of the morning’s coverage. According to S&P Global, the overall rate of inflation in the survey hit its highest level since October 2022. That is not a rounding error. That is a directional signal. The same release shows employment rising at a pace not seen for over four years, which, combined with the pricing power commentary and the input cost surge, sketches a labour market that is not cooling in any way that would comfort a fixed income investor.
The consensus framing this morning treats the PMI as a catalyst for a yield move. The more uncomfortable read is that the PMI is confirming a regime that Treasury markets had been pricing only partially.
The 10-Year Treasury Yield Spike in Context
Across the curve, the move is broad and, in places, striking by any mechanical measure. The 2-year Treasury yield spiked by 13 basis points to 4.91%, the highest since May 2024. The 7-year jumped 14 basis points to 5.04%. The 30-year hit 5.39%, the highest since July 2004, having edged past the 5.37% high on September 10 and the 5.35% high from June 2007. At the 5-year note auction today, it took a yield of 5.033% to sell all $80 billion in notes, the highest auction yield since before 2006, according to Wolf Richter at Wolf Street. In the secondary market the 5-year yield then spiked a further 18 basis points.
Yesterday’s 2-year auction already required a yield of 4.787% to clear $79 billion of notes, the highest auction yield in two years. Within 24 hours, the secondary market had moved 13 basis points above that. People who bought at that auction are already underwater.
The 2-year yield carries its own signal. It is typically read as a forward indicator of Federal Reserve policy, and at 4.91% it is telling the Fed something it may not want to hear: that rate cuts are not just premature but potentially moving in the wrong direction.
The US Treasury‘s buyback announcement this morning did nothing to help. Treasury said it would buy back up to $6 billion at face value of 20-year and 30-year bonds maturing between February 2047 and February 2056. The purpose of these operations is to push down long-term yields. The cap is identical to the last buyback auction of this type, held on September 11, after which yields spiked further. Repeating the same operation and expecting a different result is, charitably, optimistic.
The actual prices paid at market value will be less than $6 billion given the substantial haircuts on debt issued during the low-rate years. The intervention is, in practical terms, modest relative to the move it is trying to arrest.
The prevailing narrative frames this as a one-session panic triggered by a single data release. The PMI inflation reading at its highest since October 2022, combined with an employment surge not seen for over four years and supply bottlenecks the survey has rarely recorded, suggests the bond market may instead be catching up to a growth-and-inflation combination that has been in plain sight for several months. The 10-year Treasury yield spike through 5% is less a break of resistance and more a belated acknowledgement of where underlying conditions have been pointing.
