Global bond yields climb across US, UK, Japan

That matters for investors because higher sovereign yields compete directly with risk assets and force a repricing across credit, equities and emerging markets. A 5%-plus US long bond yield raises the hurdle for equity valuations and makes long-duration assets less attractive unless earnings growth can keep up. The move also tightens conditions for borrowers that rely on access to global capital markets, from investment-grade issuers to lower-rated sovereigns. Pakistan’s next Eurobond or Sukuk sale is a case in point: when developed-market government bonds offer more than 5% with far less credit risk, Islamabad must pay up to clear the market.

The pressure is increasingly broader than governments. The five biggest US hyperscalers — Microsoft, Amazon, Alphabet, Meta and Oracle — are guiding toward $635 billion to $690 billion of combined capital spending in 2026, with consensus nearer $870 billion in 2027. If those numbers are realized, AI infrastructure will become a major claimant on the bond market just as sovereign supply remains elevated. That is a shift from the past decade, when large tech groups mostly funded growth from cash flow. Now, their investment plans are consuming an estimated 94% of operating cash flow in 2026 and 2027, forcing more borrowing.

That is already showing up in corporate debt markets. Alphabet, Amazon, Meta, Oracle, Nvidia and SpaceX had issued about $244 billion of bonds by early July, more than twice the prior year’s pace, and demand for some of the biggest deals has been respectable rather than exceptional. Amazon’s recent bond sale drew subscription of about 1.6 times, adequate by normal standards but weaker than the strongest tech financings, especially in the longest maturities. Investors are beginning to ask whether a debt-funded AI boom can keep generating returns fast enough to justify the financing costs.

Japan’s rate shift is the other crucial channel. After the Bank of Japan lifted policy rates to 1% in June, the 10-year JGB yield has more than tripled in two years and crossed 3% for the first time since 1996. That threatens the yen carry trade and could prompt Japanese investors — the largest foreign holders of US Treasuries at roughly $1.2 trillion — to bring money home or demand higher compensation abroad. The July joint US-Japan currency intervention underscored how closely these markets now move together.

For Pakistan and other frontier borrowers, the message is clear: the world’s benchmark borrowing costs are not drifting higher in isolation, they are converging at levels that make external funding more expensive everywhere. A stronger dollar, firmer oil around $100 a barrel and thinner reserves amplify the effect by tightening currency and inflation pressures at the same time. The most likely consequence is that countries dependent on external financing will need to diversify away from traditional dollar Eurobonds, lean more heavily on multilaterals, Gulf funding or Chinese market access, and move faster on fiscal reforms.

The bull case for borrowers is that growth and earnings can eventually outrun the higher rates. The bear case is that global capital is entering a phase in which scarce savings, heavier government issuance and a capital-hungry AI boom keep real funding costs elevated for longer. If that happens, the bond squeeze will not stay confined to London, Berlin, Tokyo and Washington; it will be felt in pricing, refinancing and policy choices from Islamabad to Silicon Valley.