Business
JGB Yields Hit a 29-Year High Before Tokyo Intervened
Tokyo's bond market closed at a 29-year yield high before either official spoke. The $34.5 billion in dollar sales came more than three hours later.
On April 6, Wolf Street recorded the 10-year JGB yield at 2.432%, already a 29-year high, as the yen traded near 160 and officials cycled through warnings that produced no dollars sold. The yield did not pull back. Over the next 24 days it rose to briefly above 2.5%, touching a reported 2.535% intraday, during the April 30 session that closed at 3:30 p.m. Tokyo time. Atsushi Mimura, the vice finance minister for international affairs, issued his "final warning before action" at approximately 3:45 p.m., 15 minutes after the bond market had closed on its highest reading since June 1997.
The Bank of Japan's April 28 meeting had framed the bind three days earlier. The BoJ held its policy rate at 0.5% while raising its 2026 CPI forecast from 1.9% to 2.8% and cutting its GDP projection from 1.0% to 0.5%. Japan imports roughly 90% of its crude oil, most from the Middle East, and oil above $100 per barrel since the Iran conflict had kept imported inflation elevated. Publishing a stagflation forecast while leaving rates unchanged places the entire adjustment burden on the currency.
Finance Minister Satsuki Katayama followed with a second warning shortly before 5 p.m., telling reporters "the timing for taking decisive action is finally approaching." Dollar-selling intervention started just past 7 p.m. CFTC data as of April 21 had shown speculative traders holding 94,460 net short yen contracts, the most since the July 2024 operation, nine days before Tokyo spent anything. Unlike the crude futures positions that ran ahead of Trump's Iran policy announcements in the months before, the JGB and yen positioning wasn't a bet on a single undisclosed decision. The pressure had been accumulating since the BoJ formalized its stagflation forecast in print on April 28.
Bank of Japan balance sheet data published May 1 indicated the April 30 operation cost approximately 5.48 trillion yen, around $34.5 billion at rates near 160. That is close in scale to the 5.53 trillion yen Tokyo spent in July 2024, though the July operation ran alongside a simultaneous BoJ rate hike that helped the recovery hold. This time the rate stayed at 0.5%, and the yen moved from 160.72 into the mid-155 range before settling near 157.21 by May 1.
CFTC data published after the intervention showed net short yen positions had expanded from 94,460 contracts to 102,100. Speculators added to their shorts while Tokyo was spending $34.5 billion. Mimura declined to comment on further operations, describing the Golden Week window as "still in its early stages," the framing he used before secondary interventions in 2024 as well. Japan's reserves stood at $1.37 trillion as of March 2026, down roughly $36 billion from the prior month. The 30-year JGB at 3.76% is the next level to watch; a push through 4% would make the April 28 BoJ hold look less like a verdict and more like a due date.