Well Over $700 Billion Wiped From Memory Stocks Since Oct 10 — Samsung, SK Hynix, Micron and Peers Down 11–26% After CXMT 4F² DRAM News; Goldman Still Names Samsung and SK Hynix Buys

On Oct 16, 2026, Yahoo Finance reported a Goldman Sachs note saying well over $700 billion had been wiped from the market value of memory stocks — Samsung, SK Hynix, Micron, SanDisk, Kioxia and CXMT — since Oct 10, with sector falls of 11% to 26%. SK Hynix dropped about 25–26% over roughly five sessions (CNBC, 15 Oct; Korea JoongAng). Samsung alone fell 7.39% on Oct 13 (Korea JoongAng Daily). The trigger cited was China's CXMT progressing on a denser 4F² DRAM cell architecture, with a server-memory product planned by end 2026. Goldman named Samsung and SK Hynix as buys, arguing the market overestimated how fast China can close the advanced DRAM/HBM tech gap. Prefer "$700B+" / "well over $700B"; never an unverified $738B figure. Holdings: AllFactsAI holds SK Hynix and MU among others.