---
symbol: "JP225"
name: "Nikkei 225"
date: 2026-08-18
change_pct: -2.633713855247146
direction: "down"
event_type: "macro_print"
url: "https://perplo.app/why/JP225/2026-08-18"
updated_at: 2026-08-18T13:06:29.476Z
---

# Why Nikkei 225 (JP225) fell 2.63% on August 18, 2026

Nikkei 225 (JP225) fell 2.63% on August 18, 2026 — Japan bond yields hit 30-year peak, crimp growth.

## What happened

Japan's 10-year government bond yield surged to a three-decade peak, marking a sharp spike in borrowing costs and tightening financial conditions across the economy.

## Why it moved

Rising JGB yields compress equity valuations by increasing the risk-free discount rate and tightening credit availability; higher rates also erode corporate and consumer borrowing capacity, weighing on earnings and…

## Why it matters

Japan (Yen & Equities) theme: the yield surge reflects market repricing of inflation and BOJ policy normalcy, a headwind for equities in a low-rate-dependent market where higher yields signal less monetary support.

## What would break the thesis

If the Bank of Japan steps in with yield-curve control or signals a dovish pivot, it could cap further JGB gains and restore equities' cushion.

## Sources

- [Japan’s 10-year government bond yield rises to three-decade peak](https://www.investing.com/news/economy-news/japans-10year-government-bond-yield-rises-to-threedecade-peak-4864126) — Investing.com
- [Japan's Oil Crisis Eases, But the Import Bill Keeps Climbing](https://oilprice.com/Latest-Energy-News/World-News/Japans-Oil-Crisis-Eases-But-the-Import-Bill-Keeps-Climbing.html) — OilPrice
- [Japanese automakers vulnerable to one-two punch of Iran war, yen rally](https://www.cnbc.com/2026/08/17/japanese-automakers-vulnerable-iran-war-yen-rally.html) — CNBC

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