Apple first reached a $1 trillion market capitalization on a U.S. stock exchange during intraday trading in August 2018.
An intraday milestone occurs while trading is still underway, so it can differ from a milestone based on a closing share price. Apple’s shares rose enough during the session for the company’s equity value to pass the trillion-dollar line.
The calculation uses the share price and the number of shares outstanding. Because both the price and share count can change, market capitalization is a moving measure rather than a permanent corporate attribute.
Apple’s milestone followed years of expansion after the iPhone became its central product. The company also built substantial businesses in services, accessories, tablets, computers, and wearables, reducing reliance on a single product category.