Developed economies have become increasingly dependent on bond markets to fund government spending, and investor bases have changed significantly. Historically, the UK relied on domestic insurers and pension funds to absorb long-term gilts. Regulatory and demographic shifts have boosted foreign investors, who are more price-sensitive and quicker to sell.

The US story differs; Treasury ownership reflects the global cycle and the dollar’s safe-haven role. Foreign holdings hit 57 per cent post-crisis but fell to 32 per cent by late 2025. Japan never needed a large foreign base, as domestic banks, insurers, and the Bank of Japan’s unconventional policies absorbed supply.

The Eurozone requires attention. Despite breaching EU limits, a high share of its debt is held by non-residents, backed by assumed ECB support. Yet the 2027 French election may test that assumption, highlighting shifting sovereign funding dynamics. Tracking these structural shifts remains vital for navigating yield volatility across developed markets.