Why Nikkei 225 (JP225) rose 0.77%
Nikkei 225 (JP225) rose 0.77% on September 19, 2026 — Weaker yen & BOJ uncertainty boost exporters.
What happened
The yen weakened amid post-BOJ rate uncertainty and US bond repricing, a dynamic that typically lifts the Nikkei as exporters see improved earnings translation.
Why it moved
A softer yen mechanically boosts the yen-translated revenues and profits of major exporters (automotive, electronics, machinery) — the core Nikkei weight — even as their dollar revenues stay flat.
Why it matters
Japan (Yen & Equities): The relationship is direct — BOJ policy uncertainty and relative rate differentials vs. the Fed drive currency swings, which in turn price the equity index.
What would break the thesis
If the BOJ signals a tightening cycle or the yen spikes on safe-haven demand, exporter support evaporates and the Nikkei loses its structural bid.