Alphabet reaches $4 trillion market capitalization

Alphabet’s market value crossed $4 trillion after shares rose about 1% following Apple’s announcement that it chose Google’s Gemini for its AI models; the company also finished 2025 with a roughly 65% gain in its shares.

Alphabet reached a market capitalization of $4 trillion after shares rose about 1% following an announcement from Apple that it had selected Google’s Gemini to underpin its artificial intelligence models and the next generation of Siri. The move adds to momentum for Alphabet after a strong 2025 in which its shares rose about 65%. The company has recently rolled out new AI and hardware developments, including the Ironwood tensor processing unit and Gemini 3. Key developments: - Alphabet’s market value crossed $4 trillion after a roughly 1% pop in shares on the Apple announcement. - Apple said it would use Google’s Gemini as the foundation for its AI models and to power the next generation of Siri. - Alphabet joined Nvidia, Microsoft and Apple as companies that have reached the $4 trillion mark; the article reports that Apple and Microsoft later fell below that level. - Alphabet’s shares rose about 65% in 2025, described as its sharpest rally since 2009. - Recent product steps cited include the Ironwood seventh-generation tensor processing unit and the release of Gemini 3 in December. Summary: Alphabet’s entry into the $4 trillion group follows a year of strong share gains and recent AI and chip developments that the article says have helped restore investor confidence. Analysts cited in the article have upgraded or highlighted Google’s position in AI and cloud services, while broader market positioning and future movements are undetermined at this time.