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Alphabet Joins $4 Trillion Club After Apple Picks Gemini for Siri

A broad AI push — Gemini 3 progress, Ironwood TPUs, robust cloud bookings, and a favorable court ruling — drove a rapid re‑rating.

Overview

  • Apple and Google announced a multi‑year collaboration in which Apple's next‑generation foundation models will run on Google's Gemini and cloud tech, with a more personalized Siri slated for release this year.
  • Alphabet became the fourth company to reach a $4 trillion valuation and recently surpassed Apple in market cap for the first time since 2019.
  • Shares jumped about 65% in 2025 as Gemini 3 drew strong reviews and Google unveiled Ironwood, its seventh‑generation TPU, which it is also renting to outside customers.
  • Google Cloud reported 34% revenue growth in Q3 and a $155 billion backlog of unrecognized contracts, signaling strong enterprise demand for AI services.
  • A September federal court ruling rejected calls to break up Alphabet and Berkshire Hathaway disclosed a stake, reinforcing investor confidence even as AI‑trade volatility remains a risk.