The buying and selling of stocks (shares) in companies; refers to stock transactions conducted by individual or institutional investors, often via stock exchanges.
最近はスマホで簡単に株式取引ができるようになった。
Recently it's become easy to trade stocks on smartphones.
株式取引にはリスクとリターンの両方があることを理解しておくべきだ。
One should understand that stock trading involves both risks and returns.
証券会社の口座を開いて株式取引を始めた。
I opened a brokerage account and started trading stocks.