The tech giant's shares have soared since reporting better-than-expected quarterly earnings on Tuesday after the bell. The stock jumped 5.9 percent on Wednesday and continued higher Thursday.

The stock reached the price of $207.05 that was needed to bring it to the $1 trillion mark.

Apple is the first publicly traded U.S. company to hit a $1 trillion market capitalization. Amazon, which some analysts speculated would reach the milestone first, is second in value, worth $879 billion at last count on Thursday.

Apple revealed an adjusted outstanding share count of 4,829,926,000 alongside the company's June quarter results in a filing Wednesday.

The share count was lower than the previous number as it factored in the company's hefty stock buybacks. Market value is stock price times shares outstanding.

— CNBC's Sara Salinas contributed to this report.