A word to the wise: do not rely on the iOS Stocks app for Japanese stocks. The iOS 11 Stocks version of the app was actually handy until Verizon took control of the old Yahoo Inc. backend service. 3 things happened: Japanese language support for stock tickers broke, stock prices updates were delayed 20 minutes or longer, and individual stock news feeds dried up.
iOS 12 Stocks fixed Japanese language support for stock tickers but they are not dynamic; if a company changes its name your registered stock ticker will never update until you delete and re-register it. Individual stock news feeds have returned but are mostly useless selection of bad AI.
The biggest problem remains: stock prices are still delayed anywhere from 20~30 minutes to 24 hours. If you follow Japanese stocks do yourself a favor and use Yahoo Japan Finance (web/app), or any of the stock apps on the App Store (JP).