Alphabet Hits $3 Trillion Market Cap

Google’s parent company, Alphabet, has officially become the fourth publicly traded company to cross the $3 trillion valuation milestone. The elite club already includes Apple, Microsoft, and Nvidia, and now Alphabet joins their ranks after a surge in its stock price.

On Monday, September 15, Alphabet’s shares jumped more than 4% to $251.22, pushing its market capitalization just past the $3 trillion mark. This achievement highlights the company’s continued dominance in search, advertising, and increasingly, artificial intelligence.

What Drove Alphabet’s Stock Surge?

Alphabet’s stock has been on an impressive run in 2025, climbing more than 70% since April and adding nearly $1.2 trillion in value during that period. A key catalyst was a favorable antitrust ruling from U.S. District Judge Amit Mehta earlier this month.

The ruling rejected calls by the U.S. Department of Justice to force Google to sell its Chrome browser and Android operating system, both central to its business. Instead, the court ruled that regulators had “overreached” in their demands, noting that the rise of new AI players such as OpenAI has already reshaped the competitive landscape.

This lighter-than-expected decision reassured investors, leading to a rally that boosted Alphabet’s market cap by more than $230 billion in just four days.

Nearly Two Decades in the Making

Google’s journey to the $3 trillion mark has been two decades in the making:

• 2004: Google went public with its IPO.
• 2015: Alphabet was created as Google’s parent company.
• 2025: Alphabet breaks into the $3 trillion club.

The milestone demonstrates how Google evolved from a simple search engine into a tech powerhouse spanning search, cloud services, YouTube, Android, and AI-driven innovation.

The Bigger Picture

Alphabet’s milestone also signals broader market confidence in Big Tech despite regulatory pressures. With Apple, Microsoft, Nvidia, and now Alphabet all above the $3 trillion threshold, investors are betting on tech companies that dominate both hardware and software in the age of artificial intelligence.