On January 12, Alphabet’s market capitalization surpassed $4 trillion for the first time, becoming only the fourth global company to reach this milestone. The surge was driven by investor enthusiasm around the adoption of its Gemini AI models, which now power over 650 million monthly users, up from 450 million just six months ago. The announcement that Apple will deploy Gemini technology in its next Siri upgrade reinforced confidence in Alphabet’s AI leadership, pushing the stock to record highs in intraday trading and cementing its status alongside fellow mega-caps.

Glen Kacher, founder of Light Street Capital, told CNBC’s Closing Bell that Google is poised to be the primary long-term winner from the AI revolution. Citing the company’s deep investments in custom Tensor Processing Units (TPUs), a growing enterprise customer base for Google Cloud’s AI platform, and strong monetization in search and advertising, Kacher argued that Alphabet’s infrastructure spending will translate into sustained cash flow growth. He pointed to a 15 percent year-over-year increase in search revenue during Q3 2025 as evidence that AI enhancements are already bolstering the core business.

Laura Martin, senior analyst at Needham & Company, downgraded Alphabet from Strong Buy to Buy, noting that a 19.7 percent rally in 2025 has expanded the forward price-to-earnings multiple from 20× to 30×, leaving fewer catalysts unpriced by the market. While she lauded the technical superiority of Gemini 3.0 and the strategic value of Google’s TPU roadmap, Martin highlighted that most major positive developments—such as the Siri partnership and robust ad revenue growth—are already reflected in the current valuation, constraining near-term upside potential.