October intensified the regime shift already visible in September. The month began with sovereign bonds still absorbing the combined effects of renewed monetary tightening, heavy supply, fiscal anxiety and a worsening energy shock. Ten-year US Treasury yields remained above 5%, long-dated European yields stayed under pressure, and the stronger dollar tightened conditions further for energy importers and emerging markets. Oil extended its extraordinary advance, while gold weakened and the previously dominant AI complex lost momentum. Pictet describes the preceding bond sell-off as the largest weekly Treasury decline on record, with ten-year yields above 5.2%, thirty-year yields above 5.5% and oil up almost 18% over the review period.
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Read MoreSeptember delivered a unusually severe test of the market’s internal structure. The ten-year US Treasury yield rose by 53 basis points, its largest monthly increase since September 2022; the Federal Reserve tightened for the first time since 2023; Brent gained almost 14%; and both the S&P 500 and European equities fell. Yet global equity indices ended the quarter only around 2% below record highs and remained more than 12% higher year-to-date.
The chartbooks largely confirm this resilience, but with an important qualification. The equity regime has not broken; rather, leadership has rotated towards assets capable of tolerating higher nominal growth, higher inflation and scarcer energy. Technology remains a structural leader, but energy, healthcare, materials and selected non-US markets are increasingly important. The weakest signals are concentrated in the rate-sensitive domestic sectors and in countries exposed to deteriorating terms of trade.
Read MoreAnalysts and economist are, broadly speaking, offering up four separate reasons for the continued rise in developed market, and in particular, US bond yields. A resurgence in inflation due to the negative supply shock in global energy markets as a result of the US-Iran war, loose fiscal policy with little or no credible plan for any near-term consolidation, a reflection of improving underlying growth and rising productivity—linked to the AI investment boom—lifting the real neutral rate for “the right” reasons, and more specifically in the context of AI, rapidly accelerating AI debt issuance “crowding out” government debt issuance, lifting the cost of capital for the sovereign.
The idea that AI debt issuance is now a key driver of rising bond yields via a “crowding out” effect has captured a lot of attention in recent weeks with key Wall Street analysts and publications offering evidence to support the claim. The FT’s Toby Nangle, however, is not so sure, and in a recent FT Alphaville piece he sets out to rebut the claim.
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