Nikkei Slips 0.5% as Iran Oil Fears Meet BOJ Hold at 1.25%

Japanese equities opened the week lower as Middle East risk and energy costs weighed on sentiment, with the Nikkei Stock Average down about 0.5% at around 62,400 on Monday. Semiconductor and electronics shares led the decline. Chip testing equipment maker Advantest fell 1.7%, and electronic components producer Murata Manufacturing slipped 1.0%. In currency markets the dollar traded near 157 yen, little changed from Friday's Tokyo stock close. Oil had settled at a five-month high on Friday. ING economists expect the Bank of Japan to leave its policy rate at 1.25% at this week's meeting, with two further 25 basis point hikes pencilled in for January and April 2027.

Context — Why Japanese Assets Are Trading on Middle East Headlines

The report frames oil as the dominant near-term risk for Japanese assets. Japan is a major energy importer, so a further rise in crude tied to the Iran conflict raises costs across the economy. That pressure shows up in two places: corporate margins, as input costs climb, and the trade balance, as the import bill grows. Both weigh on the yen, which the report describes as soft near 157 per dollar.

A sustained oil climb would also reinforce imported inflation. That matters because it complicates the BOJ's stated preference to wait before tightening again. The report notes that a persistent rise in crude could pull hike expectations forward from January — the same month ING currently pencils in the next increase.

The BOJ raised rates last month, and ING expects this week's meeting to serve as a monitoring pause rather than a turning point. Policymakers may want more time to assess the economy, particularly while government support for domestic demand continues.

Because a hold is already fully priced, the report argues the yen and Japanese government bond yields are more likely to react to guidance than to the decision itself. A more hawkish tone could offer the currency some relief. That dynamic sets up this week's communication as the real event, not the rate announcement.

Data — What the Numbers Show

The Nikkei's roughly 0.5% decline put the index near 62,400. Advantest's 1.7% drop and Murata's 1.0% fall made them the visible drags among chip and component names. The dollar sat around 157 yen, essentially unchanged from Friday's Tokyo close, which tells you currency markets are waiting rather than positioning.

Asset	Level / Move
Nikkei Stock Average	~62,400, down ~0.5%
Advantest	-1.7%
Murata Manufacturing	-1.0%
USD/JPY	~157, little changed
BOJ policy rate (expected)	1.25%
ING terminal rate (2027)	1.75%

Oil reaching a five-month high on Friday is the single input behind the equity softness. ING's rate path implies 50 basis points of additional tightening from the current 1.25% level, taking the policy rate to 1.75% by April 2027. That is two 25 basis point moves spread across roughly six months, a gradual cadence that matches the bank's view that policymakers will take their time.

On the data calendar, Tokyo October inflation is expected to show headline CPI steady year on year and core inflation easing slightly, according to ING's read of consensus. September nationwide retail sales and industrial production are also due.

Analysis — Why Chips and the Yen Carry the Risk

Tech and chip-related names remain the most sensitive part of the Japanese market to risk-off swings driven by Middle East headlines. Advantest and Murata sit in that group, and their declines on Monday illustrate how quickly geopolitical headlines transmit into high-beta semiconductor exposure. The mechanism is straightforward: energy-intensive manufacturing faces higher input costs, and global risk appetite cools when conflict escalates.

The yen's position near 157 per dollar is the other transmission channel. A soft currency amplifies the cost of imported energy, which feeds back into the inflation problem the BOJ is trying to manage. That circularity is why the report flags oil as the dominant risk rather than a secondary one.

The counter-argument deserves weight. If oil stabilises or retreats, the imported-inflation impulse fades, and the BOJ's patient stance becomes easier to hold. ING's base case already assumes no move this week, so the burden falls on messaging. A hawkish tone could lift the yen and JGB yields without any change in the policy rate.

Positioning reflects that split. With a hold fully priced, there is little to trade in the decision itself, so flow is likely concentrated in guidance interpretation and in the incoming inflation and activity data. Traders long yen weakness have the oil channel working against them if crude keeps climbing.

Outlook — What to Watch Next

The immediate catalysts are the BOJ's tone and the data releases. Tokyo October CPI is the first inflation read that could shift hike expectations, with September retail sales and industrial production rounding out the picture. ING's January and April 2027 hike dates are the markers to test against those prints.

On the geopolitical side, the report points to Middle East developments and crude as the variables that matter most. Oil's five-month high on Friday is the reference point; whether that level holds or extends will determine how much pressure reaches corporate margins and the trade balance.

For the yen, 157 per dollar is the level in play. A more hawkish BOJ message could offer the currency relief, while a sustained oil climb would keep it soft. For equities, Advantest and Murata are the names that moved first, and they are likely to keep leading any risk-off leg tied to Iran headlines.

Frequently Asked Questions

What does the BOJ holding at 1.25% mean for the yen?

A hold is already fully priced, so the decision itself should not move the yen much. ING expects attention to centre on the tone of the BOJ's messaging. A more hawkish signal could offer the currency some relief from its soft level near 157 per dollar, while a dovish tone would leave it exposed to the oil-driven imported-inflation channel.

Why did Advantest and Murata fall more than the Nikkei?

Advantest dropped 1.7% and Murata lost 1.0%, both steeper than the index's roughly 0.5% decline. The report identifies tech and chip-related names as the most sensitive part of the Japanese market to risk-off swings driven by Middle East headlines. Higher energy costs and cooling risk appetite hit semiconductor and component exposure hardest.

When does ING expect the next BOJ rate hike?

ING's base case assumes two further 25 basis point increases, in January and April 2027, lifting the policy rate from 1.25% to 1.75%. The bank expects this week's meeting to be a pause to assess last month's hike, with government support for domestic demand giving policymakers room to wait before tightening again.

Bottom Line

Oil is the variable that decides whether Japan's soft yen and chip-led equity weakness persist or fade.

Disclaimer: This article is for informational purposes only and does not constitute investment advice. CFD trading carries high risk of capital loss.