Doubts over Japanese yen intervention are growing as institutional and corporate fund flows continue to favor the US dollar, according to BNY Mellon. Despite verbal warnings from Tokyo and the first joint US-Japan currency intervention since 2011, the yen remains pinned near 159.25 against the dollar, reflecting persistent economic pressures that short-term market operations have failed to reverse.
The intervention effect has been limited. In the hours after the coordinated sale of dollars for yen, USD/JPY briefly fell below 155.00, but buying interest quickly reemerged as traders viewed the move as an opportunity to rebuild long dollar positions. The wide interest rate differential between the Federal Reserve and the Bank of Japan continues to support carry trade flows into the greenback, while Japan's finance ministry signals readiness to act again if depreciation accelerates.
BNY Mellon’s client data shows dollar-favorable flows from institutional investors and corporations, suggesting that one-off intervention may only create short-term volatility rather than a lasting yen recovery. Analysts note that a sustained shift would require either Federal Reserve rate cuts or more aggressive Bank of Japan tightening, alongside a change in global risk sentiment. Until then, market participants expect the dollar advantage to persist and view further intervention as a key political risk around the 160.00 to 161.00 levels.