Warren Buffett and Philippe Laffont invest $5.6 billion in Alphabet during AI growth.

Three billionaire investors collectively injected $5.6 billion into Alphabet Inc. in the third quarter, showing their support for the Google parent company’s focus on advancing artificial intelligence technology.

Warren Buffet’s Berkshire Hathaway made a significant move by initiating a $4.3 billion position, acquiring 17.85 million shares. Meanwhile, Philippe Laffont’s Coatue Management substantially increased its holdings by 259%, purchasing an additional 5.21 million shares valued at approximately $1.27 billion. Stanley Druckenmiller’s Duquesne Family Office also joined in by acquiring 102,200 shares worth $24.8 million.

These strategic investments coincided with Alphabet’s milestone of achieving its first-ever quarterly revenue exceeding $100 billion.

Despite Buffett’s historical preference for avoiding tech stocks, Berkshire’s stake in Alphabet became its 10th-largest equity holding. This move surprised many, especially considering Buffett’s prior admission of regret for not investing in Google during its early growth phase. In 2018, Buffett candidly expressed, “I blew it,” highlighting his missed opportunity when Berkshire’s Geico unit was an early customer for Google’s advertising services.

Coatue Management’s increased investment in Alphabet now positions the tech giant as its fourth-largest holding. In contrast, Druckenmiller made multiple strategic shifts within the tech industry, completely selling off its stake in Microsoft while initiating new positions in other tech companies.

It is worth noting that all three billionaire investments occurred prior to Alphabet’s third-quarter earnings report release on October 29.

Alphabet’s financial performance for Q3 2025 showcased revenue reaching $102.3 billion, marking a 16% year-over-year increase. Notably, Google Cloud revenue experienced a significant acceleration, surging by 34% to $15.2 billion, following a 32% growth rate in the previous quarter.

CEO Sundar Pichai shared exciting news about landing more billion-dollar cloud deals in Q3 2025 than in the previous two years combined. Additionally, he highlighted that over 70% of existing Google Cloud customers are utilizing AI products. The popular Gemini AI app also experienced a notable increase in monthly active users, climbing from 450 million to 650 million between Q2 and Q3.

When comparing Alphabet’s valuation to competitors, the company trades at around 27 times forward earnings, positioning it below tech peers like Microsoft at 32 times and Nvidia at 42 times. The billionaire investments in Alphabet signal a strong vote of confidence in the company’s ability to capitalize on AI technology while sustaining its dominance in search and advertising.

Following Berkshire’s disclosed stake in Alphabet on November 14, the company’s shares saw a 5% rally in after-hours trading. Overall, the stock has surged by approximately 50% in 2025, demonstrating solid performance and investor confidence in Alphabet’s future prospects.