Buffett's Berkshire just trounced chip stocks and flashed a rare dot-com-era signal

For three weeks, Wall Street sold the hottest trade in the market and bought one of the oldest. Chip stocks lost 15% while Warren Buffett's Berkshire Hathaway gained 7%. That swing carried Berkshire's Class B stock (BRK-B) to a record close Tuesday, its first since May 2, 2025 — the day before Buffett said he would hand the CEO job to Greg Abel. The stock pushed to an intraday record Wednesday, as did the Class A stock (BRK-A). The wait took 17 months, a stretch in which the S&P 500 (^GSPC) gained more than 35%. Yahoo Finance From Oct. 6 through Tuesday, the iShares Semiconductor ETF (SOXX) fell in 10 of 11 sessions. Berkshire rose on nine of those days, and on chips' two worst days, Oct. 14 and Oct. 16, it posted two of its best gains of the run.