Microsoft is back on top.

After trailing behind Apple for the majority of the past decade, Microsoft is the world’s most valuable publicly traded company as of market close on Friday.

The tech giant’s stock closed at $338.47 a share on Friday, giving it a market capitalization of $2.89 trillion. Apple’s stock closed at $185.92 a share, for a market capitalization of $2.87 trillion.

Market capitalization — or market cap — is the total value of all the shares of a publicly traded company. In other words, it’s the market value of the company.

Microsoft’s rise to the top comes after the company had a stellar year thanks to its success with generative artificial intelligence.

In 2023, the company’s CEO, Satya Nadella, made a multi-billion dollar investment in AI, including commercializing and adding AI tools like ChatGPT into its suite of products before rivals.

He even strengthened Microsoft’s ties to ChatGPT maker OpenAI, a major pioneer in the field of artificial intelligence, during a board and leadership upheaval at the smaller company late last year.

Apple, meanwhile, is facing a barrage of problems. iPhone sales are slowing in part because of the Chinese government’s reported efforts to restrict purchases (Beijing denies it has put any restrictions in place). That’s helped Chinese smartphone maker Huawei to gain market share.

Apple also recently contended with a brief ban from selling the latest Apple Watch models in the United States.

Microsoft declined to comment, while Apple did not return CNN’s request for a comment.