noun
stock
STAHK/stɑːk/
Shares representing ownership in a company.
The owners hold stock representing parts of the same company.

Etymology
The tree-trunk word developed financial meanings by an uncertain route, perhaps through the image of gains growing from a trunk or through a sense meaning “money-box.” Collective wealth and money set aside led to corporate capital, underlying today’s ownership shares.
In context
equity financing is all about selling ownership stakes in your company. Okay. Usually through issuing stock. It's like bringing in partners, right? Each with a slice of the pie.