There are multiple definitions - click on the translation that matches your context.

akcje

rzeczownik

full

stock

noun

Definitions of stock

a supply of something for use or sale; any item stored by a business for use in production or sales

It's better to run out than have stock left over.

one of the equal parts into which a company's capital is divided

Its stock rose this year from $33 a share to $131 by the end of September.