(Reuters) -Alphabet's shares rose 5.2% on Monday after Berkshire Hathaway disclosed a stake in the tech giant, marking what could be one of the final major investments by the conglomerate under the leadership of Warren Buffett. The stock purchase, a rare bet on technology by Berkshire, comes amid growing concerns over heavy AI spending as tech behemoths splurge hundreds of billions of dollars to build data centers and buy chips that power them. A filing showed on Friday that Berkshire owned 17.85 million shares in Google's parent as of September 30. The stake would be worth $4.93 billion as of the stock's last close, according to Reuters' calculations. While Berkshire's investment could be seen as an endorsement of the tech sector, questions over the sustainability of the spending spree ha

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