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The changes in Berkshire Hathaway’s (BRK.A) Q3 portfolio once again captivated the global markets. Warren Buffett’s company continued to reduce its stake in its long-time favorite, Apple (AAPL), while initiating a new position in tech giant Alphabet (GOOGL). This move, involving a reallocation between trillion-dollar market cap behemoths, is widely interpreted by the market as a key evolution in Buffett’s investment framework for the artificial intelligence (AI) era.
The Core Logic Behind the Reallocation: Selling “Expensive Certainty” for “Reasonable Growth”
The essence of Buffett’s move is not a loss of faith in Apple, but rather a disciplined reassessment based on valuation and growth prospects. The core logic is to sell “expensive certainty” and buy “reasonable growth.”
There is no doubt that Apple is one of the greatest companies in American history. Its fundamentals remain solid, with an ecosystem of over 2.35 billion devices forming an unparalleled moat, and it holds a favorable position for monetizing consumer-facing AI.
However, the problem lies in its valuation. The market generally expects its earnings to grow at about 10% annually over the next three years, yet its price-to-earnings (P/E) ratio stands as high as 36, resulting in a price-to-earnings-to-growth (PEG) ratio of 3.6. This far exceeds the range typically considered reasonable in value investing (PEG below 2). For Buffett, who strictly adheres to “price is the margin of safety,” Apple’s current stock price already fully, if not excessively, reflects its future growth.
In contrast, Alphabet presents a more attractive risk-reward profile. The market expects its earnings to grow at about 16% annually over the next three years, with a current P/E ratio around 30 and a PEG ratio of 1.9, indicating a more reasonable valuation. More importantly, what Buffett is buying is not merely a tech stock, but an ecosystem with multi-layered, high-conviction monetization pathways in the AI era.
Key Catalysts Supporting Alphabet’s Growth in 2026
The market believes Buffett’s new position is based on Alphabet’s comprehensive, AI-driven growth engines for 2026 and beyond:
AI-Driven Remodeling and Efficiency Gains in Advertising: Search is Alphabet’s cash cow. The integration of generative AI features into search has already shown positive effects in increasing query volume and click-through rates. AI-powered advertising tools (like AI Max) directly improve advertisers’ return on investment. This means AI can not only defend its core advertising market share but also drive its organic growth and profit margin expansion.
A Strong Second Growth Curve in Cloud and Infrastructure: Google Cloud has been ranked by industry analysts as a leader in AI large language models and application development tools. Its self-developed TPU chips have been adopted by top-tier clients like Apple and Anthropic, with potential for deeper integration into data centers of giants like Meta in the future. This indicates Alphabet is evolving from an AI software service provider into an indispensable, core provider of AI infrastructure hardware, suggesting sustained acceleration in its cloud business growth momentum.
The Long-Term Optionality Value of Autonomous Driving (Waymo): Waymo has already launched commercial robotaxi services in multiple U.S. cities and plans rapid expansion. Although not yet profitable on a large scale, as a global leader in autonomous driving, it provides Alphabet with a “long-term call option” on a potentially trillion-dollar future mobility market. This aligns seamlessly with Buffett’s logic of investing in the “essentials of the future.”
In conclusion, Buffett’s portfolio reallocation is not speculative chasing of market trends, but a rigorous exercise in “value discovery” within the technology sector. It clearly signals that in the industrial revolution sparked by AI, he favors platform giants that possess dominant market positions, have clear and diversified monetization paths, and whose valuations have not yet priced in excessive growth expectations.
For the market in 2026, whether Alphabet can fulfill its earnings growth expectations by leveraging its AI synergies across advertising, cloud, hardware, and autonomous driving will be the key to validating Buffett’s decision. It also provides investors with a crucial window for examining the value benchmark in the AI sector.
