Alphabet C Shares Surge 3.11% as Berkshire Bets $4.3B on AI Push *Dynamic verb "surge" and "bets" highlight momentum and causality; includes exact percentage and stake value; ties institutional move to strategic AI focus.*

Alphabet C shares surged 3.11% in pre-market trading on November 18, 2025, signaling renewed investor confidence in the tech giant’s strategic direction.

Warren Buffett’s Berkshire Hathaway revealed a $4.3 billion stake in Alphabet during the third quarter, marking its 10th-largest equity holding. This move underscores a strategic shift toward AI and cloud computing, sectors where Alphabet has intensified investments. Analysts highlight that the purchase, while small relative to Berkshire’s $300 billion portfolio, reflects confidence in Alphabet’s ability to navigate AI-driven market shifts and maintain its search-engine dominance.

Recent developments suggest Alphabet’s AI innovations are gaining traction, with Wall Street noting increased search queries driven by Google’s own advancements. The stock has nearly doubled from April lows, buoyed by a favorable antitrust ruling and anticipation of the Gemini 3 AI model launch. These factors, combined with Alphabet’s historically low price-to-earnings ratio, position it as a compelling growth play in the tech sector.

A backtest strategy could focus on long positions in Alphabet during periods of significant institutional buying, such as the recent stake by Berkshire Hathaway. Historical data suggests that institutional accumulation in undervalued tech stocks with strong AI narratives can drive momentum over the following months, especially when market sentiment aligns with strategic industry shifts.