彼はその会社の株を100株持っている。
He holds 100 shares of that company's stock.
株価が急に上がった。
The stock price suddenly rose.
Original meaning: the remaining part of a tree after cutting. Rare standalone; mostly in forestry or historical contexts.
切り株が庭に残っている。
A stump remains in the garden.
clump of roots; plant with roots
Used for a plant together with its root clump, often when transplanting. Also a counter for such plants.
花の株を植え替える。
I replant the flower with its root clump.
バラを3株買った。
I bought three rose plants.
Biology: a genetic variant or subtype of a microorganism.
このワクチンは新しいウイルス株に対応している。
This vaccine works against the new virus strain.
stock company; corporation; KK
Abbreviation of 株式会社, used in company names as (株) or ㈱. Not used as a standalone word for 'company'.
See also: 株式会社
トヨタ自動車(株)は愛知県に本社がある。
Toyota Motor Corporation has its headquarters in Aichi Prefecture.
goodwill; privilege; reputation
Intangible asset or social standing built up over time. Often used in phrases like 株を上げる (gain reputation) or 株を下げる (lose face).
彼の親切な行動で株が上がった。
His kind act boosted his reputation.
あの失言で大臣の株が下がった。
That gaffe lowered the minister's standing.
Usually as お株: a person's specialty or strong point, often in a slightly teasing way.
See also: お株
料理は彼女のお株だ。
Cooking is her forte.
My father owns shares in several companies.
I sold my stock because I made a profit.
That remark raised his standing among his colleagues.
He kept being late and hurt his reputation.
株 is the common word for a stock or share, while 玉（ぎょく）is a technical finance term for a traded security or open position.
stock holdings; one's shares
tree stump; stubble
new stock; newly issued shares
old-timer; veteran; senior member · old stump; old roots
stock certificate; share certificate
bacterial strain; microbial strain
preferred stock; preference shares
one's forte; strong point; specialty
root division; dividing a plant
rented coaching stock · stock borrowing
company name with 'kabushiki kaisha' at the beginning
new bulb; new root; new stock · new share; new stock
actual shares; shares actually traded
company name ending in 'kabushiki kaisha'
old shares; previously issued stock
base of a plant or tree; near the roots
falling stock prices; low stock prices
stockbroker
kabufuda (playing cards for oicho-kabu) · merchant guild membership tag (Edo period)