-Stock is more specific. It's a type of security, and represents an "equity" investments in a business (versus lending the business money - i.e. bonds or loans)-Share is a unit of stock. All together: "My brother wanted to invest $1,000 in some sort of security. He thought about bonds, but in the end decided to buy 10 shares of Microsoft stock. Your 2020 Guide to Social Security; What Is the Difference Between Stocks, Stakes, and Shares? have a stake in a company even if you don't own shares of its stock. Bondholders, for example Key Differences Between Share and Stock. The principal points of difference between share and stock are as follows: A share is that smallest part of the share capital of the company which highlights the ownership of the shareholder. On the other hand, the bundle of shares of a member in a company, are collectively known as stock.