Summary · why it matters
Chip stocks are heading for their best quarter ever, with the Philadelphia Stock Exchange Semiconductor Index soaring 81% in the second quarter and up 94% in 2026, though last week's 7.9% plunge and continued volatility have investors questioning the rally's durability. The index's 2026 gain would mark its best year since 1999, far outpacing the Nasdaq 100's 25% quarterly rise and the S&P 500's 14% gain. Memory-related companies have led the charge, with Sandisk Corp. up 764% and Micron Technology Inc. jumping 301% to surpass a $1 trillion market cap, while Nvidia Corp. has lagged with just a 4.5% gain. Valuations remain elevated, with the semiconductor index trading at roughly 26 times estimated earnings versus a 10-year average of 19, though analysts expect chipmaker earnings to rise 49% in 2027. The Cboe Semiconductor ETF Volatility Index has surged 83% this year, reflecting a hyper-volatile environment driven by fickle retail investors and hedge fund selling.