Benzinga复盘：长鑫4F²架构进展引发AI存储抛售，DRAM/RAM及美光、SK海力士、闪迪周一重挫

The Roundhill Memory ETF (BATS:DRAM) and its leveraged counterpart, the Roundhill T-REX 2X Long DRAM Daily Target ETF (BATS:RAM), tumbled Monday as concerns over Chinese competition rattled the artificial intelligence memory trade.
DRAM fell 4.4%, while RAM plunged 8.8%. The declines followed a selloff in Micron Technology Inc. (NASDAQ:MU), SK Hynix Inc. (NASDAQ:SKHY) and SanDisk Corp. (NASDAQ:SNDK), which collectively lost roughly $108 billion in market value.
The catalyst was reported progress by China’s ChangXin Memory Technologies (CXMT) on a chip design capable of fitting more memory cells onto each chip, raising concerns that additional supply could eventually pressure memory prices.
DRAM’s Concentrated Exposure to Memory Stocks
Unlike broad semiconductor ETFs, DRAM targets companies across the memory and storage industry, including manufacturers of dynamic random-access memory (DRAM), high-bandwidth memory (HBM) and NAND flash.
Samsung Electronics accounted for approximately 18.7% of the portfolio and SK Hynix for 16.8%. Micron exposure included roughly 12.2% and 10.5% through two swap positions, alongside a 4.4% direct stock holding. SanDisk represented about 4.6%, while a swap position tied to CXMT accounted for approximately 5%.
The portfolio’s exposure to CXMT adds an unusual dimension to the China competition story. However, the impact of increased Chinese production will depend on which products CXMT can manufacture competitively and how quickly new supply reaches the market.
The risks also differ by business. Micron and SK Hynix are major DRAM and HBM suppliers, while SanDisk focuses primarily on NAND flash storage. Competition in one segment will not necessarily affect all the ETF’s holdings equally.
RAM Amplifies the Same Trade
RAM takes the exposure a step further. The fund targets 200% of DRAM’s daily performance before fees and expenses, using derivatives and daily rebalancing to achieve its objective.
Monday’s 8.8% decline in RAM, compared with DRAM’s 4.4% drop, illustrates how a leveraged product can magnify a selloff in the underlying memory trade.
The distinction matters beyond a single session. RAM’s daily leverage target does not mean investors should expect twice DRAM’s cumulative return over several days. Compounding, volatility and fees can cause longer-term results to diverge significantly from that multiple.
Bearish, Bullish Cases
The bearish case is that Chinese competition could weaken pricing power in a market where tight supply has supported memory manufacturers’ earnings.
The bullish case is that demand for AI infrastructure will continue to outstrip available capacity.
BMO analyst Harsh Kumar expects the memory market to remain undersupplied through 2027 and potentially into 2028, with NAND potentially emerging as a major bottleneck.
SanDisk’s earnings report later this month could provide further clues on NAND pricing, supply constraints and customer demand.
For investors, the distinction between the two ETFs is clear: DRAM offers concentrated exposure to memory manufacturers, while RAM magnifies DRAM’s daily moves. Both remain exposed to shifts in the AI memory cycle, but RAM adds leverage and compounding risks to an already volatile sector bet.
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