Memory Stocks MU, SNDK Plunge as TurboQuant's 'DeepSeek Moment' Rattles Sector

A sharp, concentrated sell-off hammered memory stocks today, with Micron (MU) and SanDisk (SNDK) leading a dramatic reversal for a sector that had been a market leader. While broader indices closed higher, Micron shares fell over 6% at one point, and SanDisk slid 9%, marking a severe five-day underperformance for Micron against the semiconductor index not seen since 2011. The abrupt move triggered intense 'sanity checking' among institutional clients, questioning the sustainability of the recent memory price rally.

The catalyst for the plunge appears to be a seismic shift in the competitive landscape, framed by analysts as TurboQuant's "Google's DeepSeek Moment." This event signals a potential game-changing advancement in AI or data processing architecture that could drastically reduce the future demand for traditional memory chips. The sell-off was notably selective, punishing pure-play memory manufacturers like MU and SNDK while leaving original equipment manufacturers (OEMs) relatively unscathed or even higher.

The downturn exposes a critical vulnerability in the memory sector's narrative: its explosive outperformance since last October, driven by soaring prices, may have been built on a fragile foundation. The market is now rapidly repricing these stocks based on the risk of technological obsolescence or demand destruction. This event places intense scrutiny on the long-term growth thesis for memory manufacturers, suggesting that the sector's dominance is facing its most significant structural challenge in over a decade.