The Bank of Japan hiked to a 31-year high and the yen fell instead of firming

Methodology note: Morning report, generated before the September 18 US open. Sources cited inline.

The Bank Of Japan Raised Rates To A 31-Year High And Every Japanese Market Moved The Other Way

The Bank of Japan lifted its policy rate 25 basis points to 1.25%, the highest since 1995, and the market read the decision as dovish. The yen weakened as much as 0.7% to 157.09 per dollar, the ten-year Japanese government bond yield slipped to about 2.95% in a third straight decline, and the Nikkei 225 closed 1.51% higher at 65,102 — three moves that each run against the textbook response to tightening. The 7-2 vote is why: two board members appointed this year by Prime Minister Takaichi voted to hold, which said the path is shallower than the level. The consequence for US markets is that the currency behind a large share of global carry funding did not get dearer this week, two days after the Fed's first increase in three years.

• The Bank of Japan raised its policy rate 25 basis points to 1.25%, its highest since 1995, on a 7-2 vote with board members Toichiro Asada and Ayano Sato dissenting in favour of a hold — roughly 90% of surveyed economists expected the move, so the two dissents rather than the hike were the new information, and both dissenters are reflationists appointed this year
• The yen fell as much as 0.7% to 157.09 per dollar, the ten-year JGB yield slipped to about 2.95% and the Nikkei 225 gained 966 points to close at 65,102 — a currency that weakens on its own rate rise is pricing the guidance rather than the decision, and it leaves yen-funded positions in foreign assets cheaper to hold rather than costlier
• WTI traded at $100.04 and Brent at $102.41, both lower for a third straight session, with Brent more than $5 below its September 14 high near $108 after Saudi Arabia signalled half the East-West pipeline's capacity returns within days — $100 is the exact level Thursday's report named as the point at which the energy input leaves the long end, and crude is sitting on it before the bell
• Citadel Securities counted nearly $9.6 trillion of US options notional expiring on or before today, about 35% of the entire US options market, in an August 31 note from the firm's Scott Rubner — the VIX at 15.41 is pricing calm into the session that removes a third of the market's outstanding options positioning
• CME FedWatch put the probability of a further 25 basis point increase at the October 28 meeting near 55%, with an 87% chance of at least one more this year after Chair Warsh's press conference — the US policy path has not softened this week even as the funding and energy channels both loosened, which is the tension the open has to resolve
• The Federal Reserve's August industrial production report is due this morning, forecast at 0.3% against 0.2% in July, and Governor Michelle Bowman speaks at 8:30 AM ET — the first Fed voice since Wednesday's decision, landing on the day the quarterly expiry withdraws a large block of the positioning that has held the index steady

September 18, 2026 Pre-Market

What changed since last report

• The split vote, not the level, set the price. Two dissents in favour of holding turned a 31-year-high policy rate into evidence that the committee is divided about the next one. Japanese government bonds erased earlier gains and the currency gave up 0.7% on a decision that roughly 90% of economists had already forecast — the level was priced, the division was not.
• Oil is sitting on the line Thursday's report drew. That report said a WTI settle under $100 removes the energy input that built a 5% ten-year, and a settle above $105 says the bypass is slower than announced. Crude is at $100.04 before the open, a third of the way through a three-session decline, and the level resolves rather than approaches.
• Both of this week's tightenings have landed without global funding conditions tightening. The Fed raised on Wednesday and the BOJ on Friday, and the ten-year is back under 5% from its 5.016% close, the yen is cheaper to borrow than it was, and crude is roughly $8 off its high. The policy rates went up; the cost of carrying risk did not.
• What would change it: a ten-year back above 5.016%, or a WTI settle above $105, restores the energy input to the long end. USD/JPY through 158 raises the intervention question that this hike was supposed to settle.

Movers

• AMD gained more than 1% in early pre-market on a report that it has notified partners of a roughly 10% price increase on AI accelerators, Radeon GPUs and motherboard chipsets beginning in the fourth quarter, citing higher TSMC wafer costs, with Ryzen CPUs left off the list. AMD has confirmed none of it — the figure comes from supply-chain reporting, and a company denial is what takes the move back. The same wave of reporting has TSMC notifying Nvidia, Apple, AMD and Qualcomm of 5% to 10% wafer increases, 8% to 10% on sub-5nm, which makes this a cost pass-through across the fabless layer rather than an AMD pricing decision.
• CoreWeave rose about 2% off a one-month low after falling 4.2% Thursday to $79.88 on a $3 billion convertible senior note offering due 2033, with a 2.375%–2.875% coupon and a 22.5%–27.5% conversion premium, against 2026 capital expenditure guidance of $35–39 billion. ARK Investment Management bought 239,083 shares worth about $19.1 million into the decline. The financing is roughly 8% of one year's planned capex, so the capital intensity, not the coupon, is what the equity is being asked to absorb.
• Gold rose about 1% to roughly $4,385 and silver futures 2.34% to $67.64, with December gold at $4,421.30. Metals firming while the dollar holds at 100.24 and the ten-year sits under 5% is a real-rate move rather than a policy-rate one, consistent with a week in which two central banks raised and long yields fell.

What to watch

WTI at $100.04, on the level rather than near it. A settle below $100 takes the energy input out of the long end without any diplomacy behind it, which would be the first time since the September 10 pipeline attack that crude stopped setting the ten-year. A settle back above $105 says Aramco's bypass is slower or smaller than announced. Aramco's "within days" window for restoring half the 7 million barrel-a-day line closes Monday, so this resolves inside three sessions.

The yen at 157, and whether the hike settled the intervention question or reopened it. Tokyo and Washington intervened jointly to support the currency earlier this month, and Treasury Secretary Bessent publicly pressed for a BOJ increase. The increase arrived and the yen fell through 157 anyway. A slide toward 158 puts intervention back on the table with the policy tool already spent; a reversal under 155 would say the market re-read the guidance. Resolves within days.

The expiry, and the first session without it. About a third of the US options market's outstanding notional comes off on or before today, with volume concentrating between 3:00 and 4:00 PM ET. The VIX at 15.41 measures expected volatility with that positioning still in place, so it is Monday's open, not today's close, that shows what the index does without it. The S&P 500's 7,640.82 against the 7,500 line is the range that frames it.