Apple was the first company to reach a $1 trillion market capitalization during a stock-market day in 2018.
Apple passed the threshold on August 2, 2018, during trading on the Nasdaq stock market. The milestone followed a strong quarterly report and investor confidence in the company's iPhone-centered ecosystem, growing services business, and ability to generate substantial cash.
The wording “during a stock-market day” matters because share prices change continuously while markets are open. A company can briefly move above a valuation threshold and later close below it. Market capitalization is therefore a live estimate based on the current share price multiplied by shares outstanding.
Apple's $1 trillion milestone was not the result of one new product launch alone. The iPhone, introduced in 2007, had created a large ecosystem, while services, accessories, and buybacks also influenced how investors valued the business. Later companies crossed the same threshold, but Apple reached it first among publicly traded companies.