US Treasury intervenes to support yen for first time since 2011 in coordinated push

On Friday, July 31, 2026, the U.S. Treasury intervened directly in foreign exchange markets to support the Japanese yen — its first direct yen-buying intervention since 2011 — as part of a rare coordinated effort with Japan and South Korea. The intervention followed Japan's own massive yen-buying operation the previous day and came just ahead of the Bank of Japan's policy decision.

What the U.S. Treasury did

The Treasury, through the Federal Reserve Bank of New York, conducted outright purchases of yen. According to the Financial Times, the New York Fed sold euros to buy yen on behalf of the U.S. Treasury . This was a direct intervention in the spot market, not just the "rate checks" (pre-intervention inquiries) the U.S. had conducted earlier in the year.

Earlier Friday, the U.S. Treasury informed a number of banks — via the Federal Reserve Bank of New York — that it may intervene in the yen market and told them to "stand ready for future action" . This was Washington's first direct yen-buying intervention alongside Tokyo in more than a decade .

A Reuters photo taken at a Camp David cabinet meeting on Friday captured Treasury Secretary Scott Bessent's visible notepad, which included a "to-do" list entry reading "Buy JPY 5-10 billion" . A Treasury spokesperson declined to comment on the notebook's contents or whether any intervention occurred .

The broader coordinated effort

On Thursday, July 30 (New York hours), Japan conducted "massive" yen-buying, dollar-selling intervention — its first in three months — as the yen slumped to four-decade lows near 163 per dollar . South Korean authorities also stepped in to buy the won in what sources described as an unprecedented coordinated intervention, possibly with the U.S., sending a strong joint message . U.S. authorities conducted rate checks alongside Japan's Thursday intervention as a precursor signal , then escalated to outright intervention on Friday.

Market impact

The yen spiked suddenly on Thursday after Japan's intervention, soaring as much as 3.3% — its biggest one-day gain in nearly two years — to briefly touch the 158 handle against the dollar . It had been trading around 163 earlier in the week and had hit a near 40-year low of 163.99 . By Friday Asian trading, the dollar recovered some ground, gaining 0.45% to around 160.175, as intervention risks kept traders wary .

Scale of the intervention

No specific dollar figure for the U.S. Treasury's Friday intervention has been publicly confirmed by officials. Japan's Thursday operation was described as "massive" by Nikkei , but precise amounts are not yet available. The yen's intervention follows a $70 billion yen-buying operation Japan conducted in April and May 2026 .

Bank of Japan signals

The BOJ kept its benchmark interest rate steady at 1.0% on Friday, as expected, in an 8-1 vote . Board member Hajime Takata dissented, proposing an immediate hike to 1.25% . The BOJ signaled its resolve to continue raising rates, upgraded its growth forecast, and warned for the first time that underlying inflation could exceed its 2% target . The intervention and the BOJ's hawkish messaging were both responses to the yen's protracted weakness, exacerbated by an Iran war-driven energy shock that worsened Japan's import costs .