The Roundhill Memory ETF (DRAM) experienced a sharp pre-market plunge of 5.38%.

The decline reflects a severe selloff across the global memory and storage chip sector driven by multiple converging pressures. Core constituent stocks, including Micron Technology, Western Digital, and SanDisk, fell sharply in the prior session, with the Korean KOSPI index triggering a circuit breaker. Investor concerns over excessive valuations for AI storage chips intensified, leading to a sector-wide reassessment. Sentiment was further damaged by news that Korean prosecutors raided offices of memory interface companies, including Montage Technology, Renesas, and Rambus, to investigate alleged price collusion. Additionally, a major brokerage downgraded its expectations for Q3 DRAM price hikes, citing customer resistance.

Compounding these sector headwinds, a breakthrough in disruptive memory technology raised fears about the future competitiveness of traditional DRAM. Researchers at Fudan University achieved a milestone in room-temperature single-electron non-volatile quantum memory, a potential leapfrog technology that could drastically reduce power consumption. The team plans to establish a startup, heightening investor concerns about rapid technological obsolescence in the memory chip landscape tracked by the ETF.