South Korea's two largest memory chipmakers, Samsung Electronics and SK Hynix, failed to sustain a rally on Tuesday, diverging sharply from Wall Street's semiconductor rebound. The Kospi index initially opened 1.5% higher after the Nasdaq Composite gained 2.13% and the Philadelphia Semiconductor Index advanced about 1% on Monday, but the gains quickly evaporated, with the index swinging from a 2.1% gain to a 2.8% decline. Samsung Electronics fell over 2%, while SK Hynix dropped 0.8%.
The muted response underscores that a single strong session on Wall Street was insufficient to resolve Korea's lingering positioning issues or concerns about memory supply. Monday's US advance was broad-based, driven by a return to technology and growth shares as oil prices fell, Treasury yields eased, and Amazon's post-earnings rally lifted AI-linked companies. However, the semiconductor index's modest 1% gain offered a weaker signal for memory-focused firms.
Mizuho trading-desk analyst Jordan Klein noted that investors remained cautious ahead of earnings from AMD, SanDisk, and other chipmakers, according to Investor's Business Daily. This hesitation is particularly relevant for Samsung and SK Hynix, whose profits are more directly tied to DRAM, NAND, and high-bandwidth-memory pricing than many US semiconductor companies.
The Korean stocks entered Tuesday after extreme volatility. Both Samsung and SK Hynix lost about 8.8% on Monday, following Friday's record Kospi rebound that had sent them sharply higher, including a near-30% jump for SK Hynix. The July rout was intensified by crowded positions and single-stock leveraged exchange-traded funds tied to these companies. Market data shows assets in those products collapsed from $50 billion in late June to $17 billion last week, forcing investors to reduce exposure as prices fell.
JPMorgan strategists led by Rajiv Batra told Reuters that the leveraged ETF unwind is complete and hedge-fund deleveraging is about 90% finished. While encouraging for longer-term buyers, it does not mean investors will immediately rebuild the same concentrated positions. William Brattan of BNP Paribas told Reuters that long-only investors are reluctant to manage holdings that move with such violence, explaining why a favorable Wall Street close produced only limited support in Seoul.
China's CXMT remains the clearest industry concern as the company considers another Beijing DRAM plant, potentially more than doubling its capacity if planned projects are completed. Morningstar analyst William Kerwin told MarketWatch that CXMT accounted for only about 6% of global DRAM production last year, limiting its immediate ability to disrupt Samsung, SK Hynix, and Micron. However, he warned that simultaneous expansion by all four producers could pressure prices by 2028.
The near-term outlook is stronger. Moody's upgraded SK Hynix to A3 from Baa1, citing expectations of robust profitability and cash generation over the next 12 to 18 months. Samsung has also stated that memory supply should remain tight through 2027, supported by multiyear customer contracts. These fundamentals contrast with the market's recent volatility, which has been driven more by positioning than by changes in demand.
Investors now face a delicate balance: the memory sector's underlying demand remains resilient, but Korea's leverage hangover and geopolitical supply concerns continue to distort price action. As the market digests these factors, the divergence between Wall Street's chip rally and Seoul's memory stocks may persist until positioning stabilizes further.
This article is for informational purposes only and does not constitute financial advice.
