Wall Street has been consumed for months with fears that the artificial intelligence boom is actually a bubble about to pop, but that didn’t stop Berkshire Hathaway from buying shares of a top AI hyperscaler.

Warren Buffett’s conglomerate revealed in a regulatory filing late Friday that it purchased 17.8 million shares of Google parent Alphabet during the third quarter. The stock jumped 4% in after-hours trading yesterday.

It was the biggest stock addition last quarter and was worth about $4.3 billion at the end of September. Berkshire also bought shares of Chubb , Domino’s Pizza, Sirius XM and Lennar .

Meanwhile, Berkshire maintained its position in Amazon , another AI hyperscaler, in the third quarter.

The addition of Alphabet comes amid a massive rally. Even after the mo

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