Alphabet joined an elite financial tier on Monday, hitting a $4 trillion valuation for the first time and unseating Apple as the world’s second-most valuable company.
Google’s parent company is just the fourth entity in history to cross this threshold, following Nvidia, Microsoft, and Apple. The valuation surge was driven largely by news that Apple has selected Google’s Gemini AI model to power the next generation of Siri, a move Apple described as providing the “most capable foundation” for its devices.
The deal capped a dominant run for Alphabet, which saw its stock climb approximately 65% in 2025, outpacing other “Magnificent Seven” tech giants.
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While fears of a market bubble persist, investors have flocked to Google as its AI strategy appears to be paying off. Recent product launches, including the Gemini update and the Nano Banana image generator, have been well-received, contrasting with the lukewarm reception of OpenAI’s GPT-5.
Beyond AI, Google’s cloud division has become a critical growth engine. Revenue for the unit jumped 34% in the third quarter, with a $155 billion sales backlog and a rare investment from Warren Buffett’s Berkshire Hathaway.
The financial high comes amidst significant legal headwinds.
While a judge recently ruled against breaking up the company over its search dominance, Alphabet is currently facing the remedy phase of a separate antitrust trial after being found liable for monopolizing the online ad market.
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