SK Hynix’s Overnight U.S. Surge Triggers Another South Korean Trading Curb

 

Following a brutal sell-off in the previous session, South Korean equities rebounded sharply, triggering temporary programmatic trading curbs (Sidecar) for five minutes on both the benchmark KOSPI and tech-heavy KOSDAQ.

 

Market volatility continues to intensify. Just one day after triggering a downside circuit breaker, the KOSDAQ's safety mechanisms were activated in the exact opposite direction. The KOSPI index surged nearly 7% intraday before narrowing its gains to around 6%.

 

Samsung Electronics rallied over 6%, while SK Hynix jumped over 11%, fueled by a massive 27% overnight surge in its U.S. shares.

 

The recovery follows a roller-coaster session the prior day. The KOSPI had plunged over 5% intraday, prompting the Korea Exchange to activate a Sidecar to halt programmatic sell orders on the KOSDAQ.

 

A subsequent "V-shaped" recovery—sparked by news of an upcoming high-level meeting of financial regulators on Thursday—helped the KOSPI close up 0.73%.

 

This volatility comes after the KOSPI triggered trading halts on Monday (July 13) for the seventh time this year.

Cooling U.S. Inflation and Bank Earnings Lift Wall Street

U.S. stocks closed higher overnight as lower-than-expected June CPI data eased concerns over further Fed monetary tightening.

 

The S&P 500 rose 0.4%, the Nasdaq added 0.9%, and the Dow edged higher. Strong gains in technology and semiconductor shares, paired with solid earnings from major banks like Goldman Sachs, boosted global risk appetite.

 

Notably, SK Hynix’s U.S.-listed ADRs skyrocketed 27% to lead U.S. semiconductor gainers.

 

The move completely erased the prior day’s 9.3% drop and pushed the ADR premium over its Seoul-listed common shares to 51%. This massive spread dwarfs the 3% premium seen during its listing last week, when the company raised $26.5 billion through the ADR sale.

 

Analysts attribute the widening premium to conversion restrictions between local shares and ADRs, which make traditional arbitrage too costly to execute.

 

Trading volume was further amplified on Tuesday as major U.S. option exchanges launched option products for SK Hynix ADRs, triggering aggressive buying of short-term call options.

Renewed Memory Sector Optimism

Investor confidence in the memory sector appears to be stabilizing after a recent correction fueled by anxieties over the sustainability of AI capital expenditures.

 

Strong performance in U.S. peers like Micron suggests a broader upward shift in market expectations for the memory industry.

 

A highly bullish outlook from Barclays served as the primary catalyst for the rally. Barclays analyst Simon Coles initiated coverage on SK Hynix ADRs with an "Overweight" rating and a price target of $330.

 

Coles projects that DRAM supply shortages will intensify through 2027 and persist into 2028, as supply growth fails to keep pace with the aggressive expansion of AI data centers.

 

This indicates that the memory semiconductor upcycle could last significantly longer than previously anticipated.

 

Additionally, Barclays noted that SK Hynix ADRs trade at a target P/E multiple of 8x—representing a steep discount to its U.S. rival Micron Technology—making the stock highly undervalued.