Already the world's most valuable company, Apple Inc. saw its stock hit $644.13 in morning trading Friday, before retreating to $642.
The previous high for the stock was $644, hit on April 10.
Apple has a market value of $602 billion, almost 50 percent higher than No. 2 Exxon Mobil Corp. at $408 billion.
Apple's stock fell last month after the company's earnings report for the April-June quarter showed the slowest growth in more than two years. It was only the second time in 10 years that Apple had missed analyst expectations.