Treasury Sell-Off Pressures Weakest US Borrowers as Yields Hit Multi-Year Highs

The 30-year Treasury yield recently climbed above 5.3%, a level not seen since 2007. The 10-year hit roughly 4.8%. For America’s weakest borrowers, that combination is starting to feel less like a headwind and more like a wall.

Three forces are converging to push Treasury yields higher. First, there’s supply. The US national debt exceeded $40 trillion in August 2026, and the government keeps issuing bonds to fund significant fiscal deficits. Second, foreign demand is shrinking. China’s Treasury holdings fell to approximately $651 billion as of spring 2026, the lowest since 2008. Third, corporate America is competing for the same pool of investor dollars. Hyperscalers and major tech firms have issued over $219 billion in corporate bonds so far in 2026, largely to fund AI infrastructure buildouts. US investment-grade corporate issuance overall is projected to hit a record of roughly $2.1 trillion this year.

High-yield borrowers, particularly those in the weakest CCC-rated tier, are watching their yields and spreads widen as benchmark rates escalate. Default rates in high-yield markets have risen to around 2% on a par-weighted basis, including distressed exchanges. Defaults are climbing, not falling, and the underlying rate environment is making it harder for struggling companies to buy time through refinancing.

The Treasury Department has implemented expanded long-end buybacks, increasing operations to $4 billion per auction within the September to November period. Despite these efforts, yields have largely retraced their early gains following the interventions, suggesting the buybacks are providing temporary relief rather than a structural fix.

When companies like the hyperscalers are offering investment-grade paper at attractive yields to fund AI buildouts, they effectively siphon demand away from riskier credits. Companies with near-term maturities face the most acute pressure, since they may not have the luxury of waiting for rates to come back down. If major holders continue reducing their positions, the upward pressure on yields could persist regardless of domestic policy interventions.