Microsoft's return to the top of the list in market capitalization is due to its success in the field of artificial intelligence (AI), and its leadership in the field of artificial intelligence (AI) has attracted many investors. In contrast, Apple has had its worst start in years in 2024 due to heightened demand concerns, with multiple Wall Street investment banks downgrading their ratings.

However, the stock prices of both companies are still fluctuating, and the title of "King of Market Capitalization" may change hands again at any time.

But the fate of the two companies will diverge in 2024. Microsoft shares rose 3.3%, benefiting from continued optimism about AI, but Apple fell 3.4% as concerns about growth intensified.

So far, Microsoft and Apple remain the largest companies in the S&P 500, accounting for about 14% combined. Few other companies come close to matching the two in scale.