Apple became the world's first publicly traded company to reach a market capitalization of $1 trillion on August 2, 2018.
The milestone reflected the enormous growth of Apple's iPhone business, along with strong sales of Macs, iPads, services, and accessories. Market capitalization is calculated by multiplying a company's share price by its total number of outstanding shares, so the figure changes with the stock market.
Apple's achievement was widely reported as a landmark in corporate history, although the exact value fluctuated after the milestone. Some comparisons adjust historical valuations for inflation, while others distinguish between intraday and closing prices. The $1 trillion figure refers to Apple's market value during trading on that date, not to its annual revenue or cash holdings.
Other technology companies later crossed the same threshold, including Amazon, Microsoft, Alphabet, and Saudi Aramco. Apple's milestone nevertheless established the modern benchmark for mega-cap public companies.