Meanings
Usage patterns
〈物〉の株を持つto hold/own shares (of a company)
My father owns shares in several companies.
株を売るto sell stock
I sold my stock because I made a profit.
〈人〉の株を上げるto raise someone's standing/reputation
That remark raised his standing among his colleagues.
〈人〉の株を下げるto lower someone's standing/reputation
He kept being late and hurt his reputation.
Expressions
株が上がるrise in esteem; become popular · rise in value (stocks) 株が下がるfall in public esteem; fall in value (stocks) 株買い占めcornering the stock market; stock cornering