Tokyo market holidays spur yen intervention speculation

During the first half of this week, thin Asian trading leaves USD/JPY exposed to two-way risks. The absence of Tokyo participants would amplify any intervention-style decline, whereas a quiet session would allow the currency pair to drift on the wide interest-rate differential between Japan and the United States. Yen crosses are expected to follow suit. Typically, a stronger yen hurts exporters, while renewed yen weakness would benefit them.

Because Tokyo is closed until Thursday, the currency is moving through some of the thinnest trading of the year at a time when investors are testing whether Japan will again use a holiday window.

Summary:

• On Monday 21 September (Respect for the Aged Day), Tuesday 22 September (Citizens' Holiday) and Wednesday 23 September (Autumnal Equinox Day), the Tokyo Stock Exchange and Osaka Exchange will be closed.
• Trading returns to normal on Thursday 24 September and continues through Friday 25 September. The bond market is also closed for those three days.
• Offshore yen trading persists via Singapore, Hong Kong, Australia and New Zealand, albeit with reduced liquidity.
• On Friday, the yen dropped as much as 1.3% against the dollar, settling near 157, for a weekly loss exceeding 2%, following the Bank of Japan raised rates without much indication of additional increases.
• Speculation exists that officials might leverage the thin liquidity to prop up the yen, citing the record intervention of approximately ¥11.7 trillion during Golden Week as a precedent.

According to the Japan Exchange Group calendar, Japan's primary markets are closed for the initial three days of this week—the Tokyo Stock Exchange and Osaka Exchange shut on Monday for Respect for the Aged Day, Tuesday for Citizens' Holiday and Wednesday for Autumnal Equinox Day. The Tuesday closure results from a rule that makes a single working day between two public holidays a holiday itself. Nikkei futures and cash equities restart on Thursday, September 24, and trade normally on Thursday and Friday. The government bond market also remains closed for those three days.

The yen never halts trading, though. Activity persists in Singapore, Hong Kong, Australia and New Zealand, but without Tokyo desks, order books and liquidity tend to shrink, allowing price swings to exceed what the underlying volume would typically support.

This is significant because the yen has just endured a tough week. It slid as much as 1.3% versus the dollar on Friday, ending near 157 and losing over 2% for the week, after the Bank of Japan's rate increase came with scant detail on the pace of further hikes. On September 8, the currency had firmed to around 153 per dollar, aided by coordinated yen purchases from Japan and the US in late July, when the pair neared 164. Part of that recovery has since been relinquished.

Against this setting, expectations are growing that Japanese officials might exploit the sparse holiday liquidity to defend the yen. Precedent exists: during Golden Week in April and May, Japan deployed an unprecedented approximately ¥11.7 trillion (about $73 billion) after USD/JPY passed 160, 161, 162, 163 and approached 164, with strategists pointing out that the holiday window magnified its effect. No official statement on intervention is anticipated this week, so market talk and Asian-session price action will likely steer sentiment.

A market holiday is exactly the sort of window where an intervention would pack its strongest punch, and Friday's decline has brought the pair within striking distance of levels that have triggered action previously. Yet this remains a risk, not a prediction. USD/JPY sits below the 160 threshold that existed before Golden Week. Earlier operations have been swift, which could make authorities hesitant to deploy funds during a period of thin liquidity only.

A sudden, unprovoked spike in the yen during Asian hours, or a move toward 160 that fails to bounce back, would reinforce the case for intervention, whereas a calm holiday drift would erode it. When Tokyo trading resumes on Thursday, the market will learn how the holiday period was valued.