Memory semiconductor shares entered a sharp correction on July 13, dragged down by shifting investor sentiment amid three growing concerns. The Roundhill Memory ETF, which tracks global memory stocks, plunged 9% on the day, marking a roughly 30% decline from its June 22 peak. The ETF had attracted record inflows at its launch in early April.
Individual losses were steeper. In Seoul, SK Hynix tumbled 15%, while its US-listed ADR fell 9%. Sandisk dropped 13% and Micron Technology lost 4% on the same day.
The first factor is a looming supply glut. SK Hynix plans to channel $26.5 billion from its ADR offering into new facilities including a plant in Yongin, boosting high-bandwidth memory capacity. Samsung Electronics announced on July 13 that it would advance the start of its Yongin semiconductor fab by one to two years, targeting 2029. These concurrent expansions have raised fears that oversupply may arrive sooner than expected. Morningstar analyst JingJieYu forecasts a cycle shift by 2029 due to massive capacity additions in 2027–2028.
The second risk is the rise of Chinese producers. ChangXin Memory Technologies and Yangtze Memory Technologies are drawing comparisons to the 'China shock' seen in other industries. Reports that Apple is considering sourcing general-purpose memory from Chinese firms have heightened concerns that Western chipmakers' high margins could erode.
The third headwind stems from demand-side innovation. Google’s TurboQuant compression technology, unveiled in March, claims to cut the memory footprint of AI models by up to sixfold. Such efficiency breakthroughs are fueling doubts about long-term memory demand growth.