Yen Holds Near Three-Month High as Japan-US Intervention Spending Exceeds $100 Billion in 2026

The yen strengthened Monday against both the dollar and euro, holding near its strongest level in roughly three months, as markets assessed whether Tokyo and Washington's coordinated intervention last week signals more action ahead.

Current levels:

→ USD/JPY: 157.05, yen up 0.18%

→ EUR/JPY: 180.78, yen up 0.45% (earlier touched 179.435 — strongest since mid-November 2025)

→ Dollar Index (DXY): 99.97, up 0.25%, snapping four straight sessions of losses

→ EUR/USD: $1.15085, down 0.11% (after a fresh 1.5-month high at $1.1559)

→ GBP/USD: $1.3429, down 0.39%

The intervention, by the numbers: Japan's central bank data indicated Monday that authorities spent as much as $36.58 billion in the latest yen-buying action, bringing total 2026 intervention spending above $100 billion across two operations, Japan's Finance Ministry confirmed. The Financial Times reported the New York Fed sold euros for yen on the Treasury's behalf through two banks, a structure that analysts said may have helped avoid signaling broader dollar weakness.

Why markets are watching for further intervention: "It became clear by Friday that there was intent... of the U.S. actually working together with the Japanese to intervene," said Juan Perez, director of trading at Monex USA, though he noted the operations are costly to repeat. Eugene Esptein of Moneycorp flagged a secondary risk: intervention funded by Treasury sales "could just push bond yields higher," depending on where along the curve Japan sells.

Bank of America's Shusuke Yamada said the coordinated action challenges the conventional view that FX intervention has little lasting effect, noting it "can exert a significant influence on the market, and trigger an inflection" depending on context.

Market focus: Investors continue to monitor USD/JPY around the 157 level alongside any updated BOJ data on intervention activity. Analysts noted that any additional coordinated intervention could involve higher resource commitments following the more than $100 billion deployed this year.

Sources: Reuters, Japan's Finance Ministry, Financial Times, Bank of America, Monex USA, Moneycorp