Alphabet's market capitalization surpassed $4 trillion, marking a historic first for the technology giant. This valuation surge immediately followed the announcement of a multi-year collaboration with Apple.

The agreement integrates Google's Gemini AI model. Gemini will power future features for Apple's virtual assistant, Siri.

This strategic partnership significantly benefits Google's AI division. It enhances distribution and credibility by embedding the technology into Apple's ecosystem, which boasts over 2.2 billion active devices. Alphabet's shares rose by approximately 1% following the news, pushing the total valuation past the landmark figure.

Alphabet is now the fourth company to reach the $4 trillion valuation. It joins Nvidia, Apple, and Microsoft in this exclusive group.