Trillion Dollar Club Companies

A "trillion-dollar company" is a publicly traded firm whose market capitalization — share price multiplied by shares outstanding — sits above one trillion U.S. dollars. The threshold is symbolic rather than fundamental, but membership reflects how much investors collectively value a company's future cash flows.

The list moves with daily share-price changes: a company can drop below the trillion mark and later cross back above. It is a subset of the broader market cap ranking; for size measured by actual sales rather than valuation, compare with the revenue ranking.