On September 15, Alphabet rose 3.04% in regular trading, trading at $345.78/share, with turnover of $35.34 billion. The stock surged on multiple converging catalysts spanning institutional endorsement, hardware economics, and AI research breakthroughs.

On the news front, Berkshire Hathaway disclosed a major new position in Alphabet following an internal review led by Greg Abel in consultation with Warren Buffett, with the investment thesis extending beyond AI alone. The move signals strong long-term conviction from one of the world's most closely watched institutional investors.

Additionally, Google Cloud's CEO revealed at the Goldman Sachs conference that AI server investments achieve payback in under two years on average, with proprietary chip recovery periods running at half that of GPU-based alternatives — underscoring a significant cost advantage. Market chatter further indicated that Blackstone's TPU procurement from Google could reach several multiples beyond the initially announced $5 billion joint venture, amplifying bullish sentiment.

Meanwhile, rumors circulated that Google DeepMind is approaching a key milestone in recursive self-improvement, a critical frontier in AI research. These layered catalysts collectively drove the broad-based rally in Alphabet shares.

(The above content is based on publicly available market information, generated by a program or algorithm, and is intended solely as a stock movement alert. It does not constitute investment advice or a basis for trading decisions.)