With Monday's gains, shares of Google parent Alphabet are up more than 50% for 2025. Adek Berry / AFP / Getty Images Close Key Takeaways Shares of Google parent Alphabet (GOOG, GOOGL) surged Monday after Warren Buffett's Berkshire Hathaway (BRK.A, BRK.B) revealed a new stake in the tech giant. Shares of Alphabet were up over 5% in recent trading, at a time when the broader tech sector lost ground. (Read our daily markets coverage here.) Berkshire bought about 17.8 million shares of Alphabet in the third q ...