Alphabet shares surged 5.21% in pre-market trading, reaching $291.42, following Berkshire Hathaway's disclosure of a $493 million investment in the tech giant. This move marks a notable shift for Warren Buffett, who has traditionally steered clear of technology stocks. Alphabet now ranks as Berkshire Hathaway's 10th-largest holding. Year-to-date, Alphabet's stock has climbed 45.91%, significantly outperforming the S&P 500's 14.49% increase, fueled by robust demand in AI and cloud services.