Alphabet, Google's parent company, has surpassed Apple to become the world's second-most valuable company, driven by its advancements in artificial intelligence. Alphabet's stock rose 2.4% on Wednesday, closing with a market valuation of $3.89 trillion, overtaking Apple's $3.85 trillion. This shift marks the first time since 2019 that Alphabet has exceeded Apple's market cap. The rise in Alphabet's valuation is attributed to its strong performance in AI, particularly with its Gemini AI model and Tensor Processing Unit chips, which have been well-received in the market. Alphabet's stock has surged over 65% in 2025, positioning it as the top performer among major U.S. tech companies. Meanwhile, NVIDIA remains the most valuable company with a valuation of approximately $4.6 trillion.