The Japanese yen rose sharply against major peers during European trading on Wednesday, with EUR/JPY down more than 0.3% to about 185.40. The move followed reports of renewed official warnings on the currency, while it remained unclear whether the Bank of Japan (BoJ) had intervened directly; Japan’s Ministry of Finance declined to comment on the cause, according to Reuters. Separately, the BoJ governor reiterated a policy stance of continuing to raise the policy rate in line with economic, price and financial conditions. The BoJ’s mandate is price stability, defined as inflation of around 2%. It adopted ultra-loose policy in 2013 through Quantitative and Qualitative Easing (QQE), then added negative interest rates in 2016 and began controlling the yield on its 10-year government bonds; in March 2024 it lifted interest rates, moving away from that stance. The prolonged stimulus contributed to yen depreciation, which intensified in 2022 and 2023 as other central banks tightened, before partly reversing in 2024. A weaker yen and higher global energy prices pushed Japanese inflation above the BoJ’s 2% target, alongside expectations of rising salaries.

Risks of Direct Yen Intervention Rise

We are seeing a significant increase in the risk of direct market intervention to support the Japanese Yen. The recent spike in the currency, following strong warnings from top officials, suggests authorities are losing patience with the Yen’s weakness, especially as USD/JPY has been testing the 170 level. This is a clear signal that the government is prepared to act decisively at any moment. The fundamental pressure on the Yen remains due to the wide interest rate differential between Japan and other major economies. For example, the Bank of Japan’s policy rate sits at a modest 0.50% as of its last meeting, while the US Federal Reserve’s rate is holding at 4.25%. This gap continues to encourage carry trades that sell the Yen, but the risk of a sudden reversal is now extremely high. Adding to this, Bank of Japan Governor Ueda’s recent hawkish language aligns with a domestic inflation picture that justifies a stronger currency. Japan’s latest core CPI reading for April 2026 came in at 2.8%, marking more than two full years of inflation above the bank’s 2% target. We believe this persistent inflation gives the BoJ a solid domestic reason to support a stronger Yen, either through policy or direct intervention.

Market Volatility and Positioning Implications

For derivative traders, this means we should anticipate a sharp spike in short-term implied volatility. The Cboe Japanese Yen Volatility Index (JYVIX) has already climbed over 15% in the past week, and we expect this trend to continue as the market prices in the growing chance of a sudden, large move. Shorting Yen volatility looks like an increasingly dangerous position in the coming weeks. We recall the interventions of 2022 and 2024, where Japanese authorities spent over $60 billion to trigger rapid, multi-yen appreciations in the currency over very short periods. The current verbal warnings are stronger than what we saw leading up to those events. Therefore, we should not underestimate the scale or speed of a potential market operation this time around. Given this, we see value in one-week and one-month call options on the Yen, as they may be underpricing the risk of a sudden, official-led rally. The cost of protection against a sharp JPY appreciation is rising but may still not fully reflect the government’s clear intent. This presents a defined-risk way to position for an abrupt policy response.

Start trading now — click here to create your real VT Markets account.