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What Is Market Cap? (Market Capitalisation Explained)

Market capitalisation — usually shortened to market cap — is the total dollar value of all of a company’s outstanding shares. It is the simplest way to measure how big the stock market thinks a company is.

The formula

Market Cap = Share Price × Total Number of Shares Outstanding

For example, if a company has 100 million shares and each share trades at $50:

100,000,000 shares × $50 = $5,000,000,000 ($5 billion market cap)

You can try this yourself with our Market Cap Calculator.

Why market cap matters

  • It shows size. Companies are grouped as large-cap, mid-cap, and small-cap.
  • It is better than share price alone. A $10 stock is not “cheaper” than a $1,000 stock — what matters is the total value and the company’s earnings behind it.
  • It is used for valuation. Analysts compare market cap to revenue or profit to judge whether a stock looks expensive.

Market cap and SpaceX / SPCX

SpaceX has been valued at hundreds of billions of dollars in private funding rounds. If SpaceX lists as SPCX, its market cap at IPO would be set by multiplying the offer price by the number of shares. A very large valuation can mean high expectations are already “priced in”, which is a risk worth understanding.

SpaceX’s exact share count and valuation at IPO are not yet confirmed. Any figures you see today are estimates.

  • Enterprise value — market cap plus debt, minus cash. A fuller picture of a company’s value.
  • Float — the shares actually available for public trading (excludes locked-up insider shares).
  • Fully diluted shares — includes shares from options and convertible securities.

Educational content only. Not financial advice.

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