The Philadelphia Semiconductor Index has climbed roughly 64% since late March. Nathan Peterson, Director of Derivatives Research and Strategy at Schwab, framed last week’s action around a single dominant theme on the firm’s Market Update podcast: “The driving engine behind last week’s push higher in stocks continued to be the AI infrastructure plays, especially in ... The AI Chip Rally Is Masking a Dangerous Truth. Half the S&P 500 Is Being Left Behind