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Japan's market gets a fresh AI tailwind as a sliding yen keeps intervention watch alive

Published Sep 23, 2026
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Summary:
  • Nikkei 225 December futures in Osaka traded about 2.5% above Friday's close as cash markets return from Silver Week on Thursday.
  • By 6:15 pm in Tokyo on Wednesday, the yen was around 157.88 per dollar and on track for a fourth consecutive decline, intensifying speculation about possible intervention.
  • AI enthusiasm and cheaper oil are buoying equities, while uncertainty around the Bank of Japan's next steps complicates the backdrop for government bonds.

Catch-up rally meets an AI boost

Tokyo comes back from Silver Week with a built-in tailwind: Nikkei 225 December futures in Osaka sat roughly 2.5% above where the index ended on Friday, pointing to a positive restart on Thursday. Global tech optimism is doing the heavy lifting. Positive initial reviews of Meta Platforms Inc.'s new AI assistant, plus Alibaba Group Holding Ltd. introducing what the company describes as China's most powerful AI chip, have reignited risk appetite after appeals from top US AI players to slow development had cooled it.

That chip-fueled momentum lifted the Nasdaq 100 to a new all-time high on Tuesday - the first since June - and the strength is now washing over into Japan. The Nikkei 225 rose 1.6% in the five sessions through Sept. 18, its best weekly advance in about a month.

Yen watch: intervention on the radar

The currency backdrop is the other key storyline. Around 6:15 pm in Tokyo on Wednesday, the yen traded near 157.88 per dollar and was on pace for a fourth straight daily loss, its longest slide since late August. Earlier, it weakened to 158.05 per dollar before trimming the move after the Nikkei reported the Bank of Japan had contacted market participants to check exchange rate levels, a move frequently viewed as a prelude to intervention. As the yen softens, options sentiment has turned more bullish on the currency, reflecting stronger demand to hedge against the risk of Japanese authorities stepping in.

Bonds, oil and the BOJ's next move

Signals for fixed income are mixed. Brent crude has dropped below $100 per barrel and US Treasury yields have fallen this week, both supportive for Japanese government bonds. Pushing the other way, the BOJ raised its benchmark rate on Friday and indicated it remains open to further tightening, while yen traders were let down by the absence of more explicit guidance. That uncertainty over the tightening path could weigh on JGBs even as global rates and oil ease. iFast's Hu You expects pressure at the front end: "The BOJ hike establishes a higher floor for short-term interest rates, so it is fundamentally negative for JGB prices at the front end."

Bloomberg Economics notes the BOJ "quickened the pace of rate hikes with its latest increase Friday," adding Governor Kazuo Ueda was "more hawkish than we had expected." Senior Japan economist Taro Kimura noted Ueda offered scant commentary on the weak yen, and instead stressed that underlying inflation is getting close to the 2% target while saying the "stage" for monetary policy has changed.

In times of uncertainty, steady strategies help protect and grow your savings. Join Briefs Finance CEO Jaspreet Singh on September 29th for a FREE live investor workshop, How to Profit From A Dollar That's Losing its Value, where he shows how we're spotting investment opportunities as the dollar falls. Save your spot.

Global politics is part of the backdrop too. Focus has shifted to a pivotal meeting that will bring together President Donald Trump and Chinese leader Xi Jinping. Japanese Prime Minister Sanae Takaichi advanced her scheduled United Nations address by two days so she could meet Trump ahead of his talks with Xi, and on Tuesday she spoke with the US president about economic and security ties with China.

What this means for your money

Vantage's Chen says the near-term path for Japanese assets largely comes down to the currency. Additional depreciation in the yen could fuel worries about inflation and raise bets on renewed BOJ tightening, which would weigh on JGBs. In other words, what initially helps equities could later translate into "another round of pressure for bonds." If the AI spark keeps spreading, a semiconductor and AI-led upswing could lift the broader market, as iFast's You suggests. The swing factors to watch are the BOJ's policy trajectory and any move to stabilize the yen, whether you are eyeing exporters, chip names, or your bond exposure.

Long term focus and disciplined choices give your finances room to thrive. Our CEO Jaspreet Singh is hosting a FREE live investor workshop, How to Profit From A Dollar That's Losing its Value, on September 29th. Sign up free to join him live.

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