Apple’s most recent stock weakness on Monday cost the tech giant its title of most valuable U.S. company in terms of market capitalization.

In Monday’s trading session on Wall Street, Apple Inc. shares dropped 2.4 percent to about $420, giving the company a market capitalization of $394 billion. Shares of Exxon Mobil Corp. fell 0.5 percent to $88.95, but the oil giant still managed to overtake Apple with a market cap of $400.5 billion.