Investors are rattled by rising U.S. bond yield. They should be more worried about Japan.

Soaring Japanese government bond (JGB) yields are posing a risk to U.S. financial assets, according to Société Générale strategist Albert Edwards, who suggests investors should closely monitor the JGB market. The rise in JGB yields could entice Japanese investors to shift investments from U.S. Treasuries back to their home market, potentially unwinding the yen-funded carry trade and triggering a sell-off in U.S. bonds and equities. Deutsche Bank notes that the yen's strength despite rising Treasury yields indicates declining foreign participation in the U.S. Treasury market, further supporting the concern that increasing JGB yields are a significant problem for U.S. assets.

Analysis

The recent surge in Japanese Government Bond (JGB) yields, highlighted by a weak 20-year bond auction that propelled the Japanese 30-year yield upwards, presents a significant and potentially underappreciated risk to U.S. financial assets. Strategists, notably Albert Edwards of Société Générale, caution that if rising domestic JGB yields incentivize Japanese investors—historically large buyers of U.S. Treasurys—to repatriate capital, the unwinding of the yen-funded carry trade could induce substantial outflows from U.S. Treasuries and equities. Edwards emphasizes that understanding and monitoring the JGB market is currently the most critical task for investors, suggesting that the recent ascent of the U.S. 30-year Treasury yield to an intraday high of 5.15% (before settling at 5.063%), a level that briefly neared its highest close since 2007, is not solely a consequence of U.S. domestic fiscal developments but is also influenced by these global fund flow dynamics. This view is corroborated by George Saravelos of Deutsche Bank, who interprets the yen's appreciation alongside increasing U.S. Treasury yields as evidence of diminishing foreign participation in the U.S. Treasury market, thereby accentuating the vulnerability of U.S. markets to a JGB sell-off that renders Japanese assets a more attractive alternative for domestic investors.

Key Decisions for Investors

• Investors should prioritize monitoring Japanese Government Bond yield movements and associated capital flow data from Japan, given their potential to significantly impact U.S. asset prices.
• Consideration should be given to the increased risk of capital outflows from U.S. Treasuries and equities if JGB yields continue to rise, potentially leading to a reassessment of positions in assets that have historically benefited from yen-funded carry trades.
• It may be prudent to evaluate portfolio sensitivity to a strengthening yen or a weakening U.S. dollar if these carry trades unwind on a large scale, impacting both U.S. assets and currency valuations.