Alphabet Hits $3 Trillion After Antitrust Win Sparks 4% Stock Rally

• Antitrust victory fuels Alphabet stock rally, surpassing $3 trillion market cap.
• Landmark court ruling boosts investor confidence by averting a forced breakup.

On September 15, 2025, Alphabet, Google's parent company, achieved a historic milestone by surpassing a market capitalization of $3 trillion. The company's stock surged over 4% following a pivotal antitrust ruling in its legal battle with the U.S. Department of Justice (DOJ).

Judge Amit Mehta ruled against the DOJ's demand for Alphabet to divest its Chrome browser business, alleviating investor fears of a potential breakup of critical operations. This decision marks a turning point in a broader antitrust case, where Alphabet had earlier been found to maintain a monopoly in the search and advertising technology markets. The ruling provided a much-needed boost to investor confidence, further solidifying Alphabet's standing in the tech sector.

Year-to-date, Alphabet's stock has climbed more than 30%, significantly outpacing the Nasdaq's 15% gain over the same period. The company now joins an exclusive group of U.S. corporations, including Apple, Microsoft, and Nvidia, in reaching the $3 trillion valuation threshold.

The landmark ruling comes as Alphabet faces intensifying competition in the artificial intelligence (AI) sector. Rivals such as OpenAI and Perplexity are challenging its dominance, shaping the court's perspective that the market for search and related services has expanded. Alphabet's ability to sustain its competitive edge will hinge on the success of its AI initiatives, particularly its developing Gemini model suite.

This legal victory serves as a pivotal moment for Alphabet, reinforcing its position in the market while highlighting the challenges ahead in the rapidly evolving tech landscape. The ruling's broader implications bear watching as Alphabet continues to navigate increasing scrutiny and competition in the years to come.