The Japanese yen is approaching its strongest level of the year, having broken through the 155-per-dollar mark and triggered a wave of stop-loss orders that have traders locking onto the 152 zone. On Tuesday, the currency strengthened as much as 0.5% to 153.53 per dollar, adding to a 1.2% overnight gain and bringing its monthly advance to nearly 3.8%, making it the top performer among G10 currencies.
There has been no single catalyst driving this move. Some traders point to thin liquidity during the U.S. holiday period, while others say the breach of the 155 level accelerated an already bullish trend. Last week, sentiment shifted sharply as expectations grew for a rate hike by the Bank of Japan, fueling the yen's rally. Speculation about possible changes to the asset allocation of Japan's Government Pension Investment Fund (GPIF) has also lent support.
According to a trader familiar with the transactions who requested anonymity, the break above 155 triggered significant stop-loss orders and forced options dealers to sell dollars. "The overnight break of the support zone clearly opens the door for further downside," said Rodrigo Catril, strategist at National Australia Bank. "USD/JPY looks highly likely to test prior lows around 152.27 and 152.10."
The 152.10 region represents the strongest support level for the dollar-yen pair this year, and it is drawing increasing attention as momentum builds. Technical indicators also point to 152 as a potential target following the breakout near 155.
The speed of this move has intensified the prospect of a broader unwind in yen carry trades, where investors borrow the currency at low cost to invest in higher-yielding assets elsewhere. "Our baseline view is that a break below 154 could trigger further unwinding of yen carry positions and additional stop-losses, opening room for more yen appreciation," said Rinto Maruyama, senior rates and FX strategist at SMBC Nikko Securities. However, he added that reduced positioning also means investors have room to rebuild short yen positions.
Attention now shifts to U.S. inflation data due Friday for clues on the Federal Reserve's policy path. In Japan, investors will closely watch remarks from Bank of Japan board member Kazuyuki Masu for signals on the potential pace of future rate hikes. The bigger test comes at next week's BOJ policy meeting, where overnight index swaps price in a 97% probability of a 25-basis-point hike, raising the bar for policymakers to deliver a sufficiently hawkish message to sustain the yen's momentum.
"The yen is at a crossroads," said Catril of National Australia Bank. "Next week's hike is a necessary condition, but for the yen to hold its recent gains, the BOJ needs to signal hawkishness and reinforce the market's view that another hike before year-end is more likely."
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