Alphabet recently achieved a historic milestone by eclipsing a $4 trillion market capitalization for the first time, solidifying its position as the world’s second-largest public company. This landmark was reached after shares closed above key thresholds in mid-January, driven by accelerating demand for its AI-powered products and services. Investors have rewarded Google’s resurgence in AI innovation, with the stock posting its best annual performance since 2009 and rallying more than 70% over the past 12 months as of mid-January.

Since combining Google Brain with its DeepMind unit in 2023, Alphabet has optimized its AI development pipeline and infrastructure. DeepMind’s acquisition in 2014 for approximately £400 million now serves as the core “engine room” for models underpinning search, ads, cloud services and the Gemini assistant. DeepMind CEO Demis Hassabis and Google CEO Sundar Pichai reportedly hold daily strategic calls, enabling the company to reduce model release cycles from years to months and maintain a competitive edge against OpenAI, Anthropic and other challengers.

Alphabet has executed one of the largest share buyback programs in corporate history, repurchasing approximately $342 billion of its shares over the trailing decade through September 2025. This level of repurchases ranks second only to Apple among S&P 500 companies, helping reduce share count, boost earnings per share and provide support under turbulent market conditions. In the most recent fiscal year, the company allocated more than $50 billion to buybacks, underscoring management’s commitment to returning excess cash to shareholders.

Despite the stock’s strong run, Google’s forward earnings multiple of roughly 30 times remains below many of its U.S. tech peers, presenting an attractive entry point for long-term investors. Yet risks persist: intensifying competition in cloud infrastructure from Amazon and Microsoft, potential regulatory scrutiny in both the U.S. and EU, and uncertainty around AI hardware supply constraints. Analysts expect revenue growth to accelerate above 15% this year, led by advertising rebound and Cloud expansion, but warn that any slowdown in AI adoption or macroeconomic headwinds could trigger volatility.