• Stock is ownership in a company.
  • Stock is sold in units called shares.
  • A person who owns stock is called a stockholder or shareholder.

When you own stock, you own a small piece of a company. Stock comes in units that are called shares. A person who owns shares of stock is called a stockholder or a shareholder. Companies are typically divided into millions, tens of millions, or even billions of shares. For example, Facebook (FB) is divided up into 2.35 billion shares.

If you want to figure out how much of a company you own, divide the number of shares you own by the total number of shares.  If you owned 23.5 million shares, you’d own 1% of Facebook. Mark Zuckerberg owns 471 million shares, which is about 20% of the company. Not too shabby.

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