When a headline says a technology company is “worth $1 trillion”, it usually does not mean the company owns $1 trillion in cash or factories.
For a publicly traded company, the common measure is market capitalisation. It is calculated by multiplying the current share price by the number of shares outstanding. If a company has two billion shares and each trades at $500, its market capitalisation is $1 trillion.
That number can change every second because the share price changes. It reflects what investors are willing to pay for a small slice of the company at that moment, extrapolated across all shares.
For a private AI company, “valuation” works differently. A funding round may set a price per share that implies a value for the entire company. The U.S. Securities and Exchange Commission notes that private valuations are often described as pre-money or post-money, depending on whether new investment is included.
Private valuations can be harder to interpret because the shares do not trade freely every day. Different share classes can have different rights, and the price negotiated by a few investors does not guarantee that the whole company could be sold at that value.
AI companies can reach huge valuations because investors expect enormous future revenue from chips, cloud computing, models or data-centre services. But expectations can move faster than current profits.
In September 2026 AMD crossed $1 trillion in public market capitalisation as investors bet on its expanding AI role. That milestone did not mean AMD received a trillion dollars; it meant the market value of all its shares reached that level.
The useful distinction is simple: revenue is money a company earns, profit is what remains after costs, cash is money it holds, and valuation is what investors currently think ownership is worth.