Investors fear Japanese bond bets risk becoming new ‘widow-maker trade’

The so-called 'widow-maker' trade, involving shorting Japanese government bonds (JGBs) in anticipation of price declines, has historically led to significant losses for global bond funds due to Japan's prolonged ultra-loose monetary policy. However, this strategy has recently become one of the most lucrative bets in the global bond market, as JGBs have lost over 4% this year in total return terms, making them the worst-performing government bonds globally. This profitability is driven by rising interest rates, fears of increased government spending, and the Bank of Japan's move towards policy normalization.

Foreign investors have actively re-engaged with the Japanese bond market, particularly in the 20- to 30-year segment, where yields have surpassed 3.5%, leading to a record 9.3 trillion yen flowing into longer-dated Japanese debt in 2025. The 10-year JGB yield reached 2.901% and the 20-year JGB yield hit 3.901% last Thursday, with the 10-year yield now around 2.781%. This has prompted some to declare the 'uninvestable' JGB market as 'investable' again. Analysts like Mark Nash of Jupiter Asset Management and Mark Dowding of RBC BlueBay Asset Management have positioned for further declines in JGB prices.

Despite the current profitability, significant risks remain for the 'widow-maker' trade. Japanese Finance Minister Satsuki Katayama recently expressed intentions to encourage pension funds, including the $1.8 trillion Government Pension Investment Fund (GPIF), to increase investments in domestic assets. This signal led to overseas investors buying a net 499.8 billion yen ($3.08 billion) of long-term bonds in the week ending July 11, the first weekly net purchase since May 30, causing the 10-year JGB yield to slip by about 20.5 basis points from its peak. Potential repatriation of capital by Japanese investors, who sold $29.6 billion of U.S. debt in Q1 2026, could also stabilize the market by providing a significant domestic buying force. Some investors also see value in ultra-long positions despite the risks, while others remain cautious due to the structural implications for the global bond market, as Japan's era as a 'silent subsidizer of cheap global borrowing' is considered over.