株 is built from the 木, 丿 (slash / sweep), and 未 components.
It belongs to a phonetic family with 殊, 珠, and 朱 — they share the 未 component and the reading シュ.
A common word using 株 is 株 (かぶ), meaning “stock; stump (of tree)”.
Don't confuse it with 朱, 珠, and 殊.