South Korea's leading memory names have delivered an extraordinary rebound. Jefferies reports that Samsung Electronics and SK hynix have rallied 798% from their 500-day low as of Monday, a gain that exceeds the 717% rise recorded during the IT bubble.
According to Jefferies, the run-up in the two stocks started in late May. The firm highlighted factors that have supported the advance, including earnings momentum and sustained retail participation, and said that top-performing stocks often extend their leadership during bubble-like moves and become historical outliers.
At the same time, Jefferies cautioned that the path ahead is unlikely to be smooth. The bank noted that later stages of such rallies tend to come with greater volatility, a dynamic that makes it harder for investors to separate short-term market noise from durable trends. Jefferies pointed to a period of heightened volatility in March and said similar episodes could repeat multiple times going forward.
On trading strategy, Jefferies suggested that active approaches which rely on frequent buying low and selling high may underperform a buy-and-hold strategy under elevated volatility conditions. The firm emphasized that day-to-day trading decisions made during volatile stretches can materially influence returns realized weeks or months later.
Jefferies also set out a short list of early warning signs that could herald a bubble collapse: an economic slowdown, irreversible increases in interest rates, or a failure by artificial intelligence firms to raise capital. The firm said it does not see those signs yet and believes more time remains before they could appear.
Separately, Barclays analysts raised their price targets on both SK hynix and Samsung, pointing to continued supply tightness in the memory market as the primary driver. In their note, Barclays wrote: "LTAs are gaining increasing focus and could help multiple perception in the near term but our positive view on ASPs holding until the end of 2027 is driven by supply/demand tightness and material HBM pricing uplift next year given conventional DRAM ASPs - something to closely monitor."
Market performance this year has been dramatic. Samsung shares are up more than 200% year-to-date, while SK hynix has gained 262.5% so far.
Context and implications
The information provided by Jefferies frames a market in which two dominant memory suppliers have outperformed historical bubble-era benchmarks, supported by near-term earnings and retail flows. However, the firm underscores that late-stage rallies often carry increased volatility and make trading outcomes more sensitive to timing and short-term decisions.