Japanese long-term bonds collectively rise! A statement from Japan’s finance minister sparks demand, 20-year bond auction heats up

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The Japanese government bond market saw a strong rebound on Tuesday, as comments from Finance Minister Satsuki Katayama ignited market sentiment. Demand at the 20-year government bond auction reached a rarely seen high in recent years, and yields on the long end fell sharply.

Katayama sent out two major signals that day: First, she proposed including Japanese government bonds in tax-exempt savings accounts (NISA), which could guide individual funds into the bond market; second, she indicated that the Government Pension Investment Fund (GPIF) would adjust its investment portfolio as needed. The news quickly boosted investor sentiment, with both the 20-year and 30-year yields falling by as much as 18 basis points, to 3.565% and 3.725% respectively. The 40-year yield also dropped by 14 basis points to 3.753%.

The result of the 20-year government bond auction was particularly remarkable, with the bid-to-cover ratio soaring to 4.52 from 2.97 previously, approaching the strongest level in seven years seen in April. Bloomberg market strategist Mark Cranfield commented that this was a strong 20-year auction, with demand far exceeding the one-year average, a tail difference of zero, and a minimum accepted price well above expectations. "Just a few comments about adjusting bond investments had an astonishingly significant effect."

Finance Minister's Comments Become the Biggest Catalyst

Katayama's remarks were the direct trigger for this rally. She proposed including Japanese government bonds in NISA tax-free accounts, which, if implemented, would introduce a new source of individual investor funds to the bond market while also helping to support the yen. At the same time, her comments about GPIF adjusting its portfolio as needed further fueled market imagination about large-scale institutional inflows.

In fact, Katayama had already publicly called last week for large pension funds including GPIF to increase allocation to domestic assets. Her comments triggered strong policy expectations in the market—leading to speculation that the government intends to guide more institutional funds into the Japanese bond market. However, according to Reuters, the government currently has no plans to comprehensively adjust GPIF's asset allocation, and such expectations had already cooled previously.

Auction Demand Hits Historic Levels

The technical indicators of Tuesday’s 20-year government bond auction validated the market’s high enthusiasm. The auction tail difference (i.e., the gap between the average price and the minimum accepted price) narrowed to 0.00, matching the record low set in 2010.

Wee Khoon Chong, Senior Market Strategist for APAC at BNY Mellon, said the result of this auction matches recent trends of revived demand across Japanese government bond maturities. "Demand is collectively supported by potential GPIF portfolio adjustments, discussion about including Japanese government bonds in NISA, and various policy measures aimed at attracting capital into Japanese assets."

Multiple Uncertainties Still Weigh on the Long End

Despite the strong market performance on Tuesday, clouds still hang over super-long-term bonds. There is uncertainty about Prime Minister Sanae Takaichi’s spending and investment plans, and concerns about her dovish stance on monetary policy continue to intensify. The market believes the Bank of Japan’s pace of rate hikes is too slow to effectively control inflation.

Meanwhile, the situation in the Middle East has tightened again, pushing oil prices higher and intensifying inflationary pressure, which poses a potential drag on super-long-term bonds. The persistent weakness of the yen is also a significant risk—the yen/dollar exchange rate is hovering near its weakest level in nearly forty years, further boosting inflation expectations by raising import costs, which also keeps the market highly alert to the possibility of official intervention.

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