Nikkei 225 · October 20, 2025
The day the premiership was locked in
+3.37%
single-day change vs previous close
What happened that day?
- On 20 October 2025 the Nikkei 225 rose 3.37% and passed 49,000 for the first time
- That day the ruling party and another party signed an agreement to form a coalition government
- The deal effectively guaranteed that the new prime minister would be elected in parliament the next day
- The market had already jumped two weeks earlier when the party chose its leader. This was the confirmation that it would become an actual government
- What it wanted was more spending and low rates — both good for shares
- The certainty was itself the news. While politics is unresolved, policy cannot be priced
- The dip before it was only 1.32% from the peak
Sources
Every figure on this page is recomputed from the original daily closing prices and checked against them at build time. The account of what happened is written from the sources listed above.