Market Cap

Key term: market capitalization

How big is a company, really? Not by counting its offices or its employees, but by the value the stock market currently places on the whole business. That figure is called market capitalization — usually shortened to "market cap" — and it's calculated simply as the share price multiplied by the total number of shares outstanding.

This is where a common mix-up happens: a high share price does not mean a company is large, and a low share price does not mean a company is small or cheap. A company with a $20 share price and five billion shares outstanding is worth far more than a company with a $400 share price and ten million shares outstanding. Price alone tells you what one slice costs — it says nothing about how many slices exist or what the whole business is worth.

Market cap is what actually answers the size question. Big does not automatically mean better, and small does not automatically mean cheap — a large market cap usually signals an established business with a long track record, while a smaller one usually signals a younger company with more room to grow (and more room to stumble).

When you're comparing two companies in a matchup, market cap gives you a quick read on what kind of contest you're watching: two giants of similar size, two young challengers, or a mismatched David-and-Goliath pairing. That framing shapes how much a single day's news is likely to move each one.

In the daily game

Market Cap sits in the Long Game section of every matchup's metrics panel — check it before assuming the higher-priced company is automatically the bigger one.