Samsung Just Confirmed the Memory Boom. Why Did Memory Stocks Fall?

Samsung's Q2 was huge, but the bar was higher

$Samsung Electronics (005930.KR)$ 's preliminary Q2 numbers were extraordinary. Revenue is expected to rise 129% year over year to about KRW 171 trillion. Operating profit is expected to rise about 19 times year over year to about KRW 89.4 trillion. That implies an operating margin of roughly 52%, far above the 6% margin Samsung reported in Q2 2025.

The message is clear: the memory cycle is still very strong. AI demand is pushing up HBM, but it is also tightening conventional DRAM and NAND supply. Citi Research said average selling prices for DRAM and NAND rose 44% and 53% quarter over quarter, respectively, in Q2. That is a powerful signal for the whole memory chain.

So why did Samsung's shares fall? The answer is expectations. The guidance beat broad market estimates, but investors had already priced in a very strong print after a major rally. Some analysts also noted that operating profit could have exceeded KRW 100 trillion without employee bonus provisions. In other words, this was a great result, but the market wanted an even cleaner upside surprise.

What it means for SK hynix

For $SK Hynix (000660.KR)$ , Samsung's report is mostly a positive read-through. It suggests memory demand remains supply-constrained across both AI and non-AI products. That matters because $SK hynix (SKHY.US)$ has one of the strongest HBM positions in the industry and is also benefiting from tight conventional DRAM supply.

The key debate is whether SK hynix can deliver cleaner operating leverage than Samsung. Samsung still has foundry and logic chip businesses that can drag on group profitability. SK hynix is a purer memory story. If its next update shows strong HBM pricing, resilient server DRAM demand, and disciplined capex language, investors may continue to treat it as the cleaner AI memory play.

What it means for Sandisk

For $SanDisk (SNDK.US)$ , the most important signal is NAND. Samsung's Q2 guidance and the reported NAND ASP jump suggest that AI infrastructure demand is spilling into storage, not just HBM and DRAM. That supports the bull case for enterprise SSDs, higher NAND pricing, and stronger data center storage demand.

Sandisk is not an HBM proxy. It is more directly tied to NAND, SSDs, and storage pricing. That makes Samsung's NAND pricing signal especially relevant. If NAND ASP continues to rise while AI builders keep adding storage capacity, Sandisk could remain one of the more direct U.S.-listed ways to trade the NAND side of the memory upcycle.

SK hynix ADR adds another catalyst this week

The Samsung print also arrives at a perfect time for SK hynix's U.S. listing story. SK hynix has launched its U.S. ADR offering, with Nasdaq trading expected under the ticker $SK hynix (SKHY.US)$ . The deal is expected to raise about KRW 43 trillion, or roughly $28 billion, and 10 ADRs represent one common share.

The institutional demand signal is strong. Baillie Gifford Overseas Limited, funds managed by Coatue Management, and Situational Awareness Partners LP have indicated interest in buying up to a combined $7 billion of ADRs. This is not a final allocation, but it is a meaningful signal from high-profile growth and AI-focused investors.

Summary

Samsung's Q2 guidance was a strong confirmation of the memory upcycle, but the stock reaction shows that expectations are already very high. For SK hynix and Sandisk, the data still points to strong DRAM, NAND, HBM, and SSD fundamentals.

The next test is whether upcoming memory earnings and SK hynix's Nasdaq debut can turn strong industry pricing into a fresh re-rating. The opportunity is clear, but so is the risk: memory stocks now need to beat not just consensus, but also a very bullish market narrative.

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