SOX jumped 8.19%. Memory names led the repair
The largest one-day gain in 15 months. SanDisk +26%, Micron +18%. The drivers were Microsoft’s Azure commentary, Lam Research, and Samsung’s multi-year memory shortage warning.
After a multi-day rout that had taken the Philadelphia Semiconductor Index into official bear-market territory from its late-June highs, July 30 produced the largest single-day SOX advance in roughly 15 months: +8.19%. The VanEck Semiconductor ETF (SMH) rose 6.8% and the iShares Semiconductor ETF (SOXX) climbed about 8.5%.
Memory did the real work. SanDisk (SNDK) finished up roughly 26%. Micron (MU) rose about 18%. Both had been among the hardest-hit names in the prior week’s competitive-driver selloff that started with Korean trading halts and SK Hynix. Samsung’s second-quarter results and explicit warning that the global memory shortage could stretch into 2028 gave the bounce a fundamental anchor rather than pure short-covering.
The other two catalysts were Microsoft and Lam Research. Microsoft’s Azure growth and capital-expenditure commentary eased the fear that hyperscalers were about to slow AI infrastructure spend. Lam Research posted strong numbers and guidance tied to the same demand. The combination flipped the narrative that had dominated the prior sessions: from “the competitive driver is winning” back toward “the demand signal is still intact.”
Context still matters. The sector had already given back more than 20% from the late-June peak and erased over a trillion dollars of market value at the trough of the move. A single +8% day repairs some of the technical damage and resets positioning, but it does not erase the questions that produced the rout in the first place. Those questions now sit next to a clearer demand signal from the two largest buyers of the cycle. The next few sessions will decide which one the market weights more heavily.