KOSPI Chip Rally Volatility
South Korea's KOSPI Surges on Short Squeeze and US Tech Rally, But Analysts Warn of Volatile Rebound
Anonymous
Key Points
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SK Hynix had fallen about 58% from its June 25 intraday peak; on July 13 it dropped 15%, triggering forced selling in leveraged ETFs and roughly $5 billion in ETF assets exiting the market, accounting for about 18% of SK Hynix’s trading volume. Trading circuit breakers were then triggered again on July 28–29 for the first time back-to-back in the exchange’s history.
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The rally produced the Kospi’s largest single-day gain on record, following three days of steep losses, and was driven in part by a short squeeze as the overnight US AI hardware rally pushed short sellers to cover.
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US-led optimism helped fuel the rebound, with positive earnings reports from Amazon and Microsoft fueling AI-capex hopes; other Korean chip players such as LG Innotek and Seoul Semiconductor also rallied, indicating broader demand in the sector.
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Before the rebound, fears of rising competition from Chinese memory chipmakers contributed to the prior slide, though sentiment improved after Wall Street’s tech-led rally.
South Korea's KOSPI posted its largest single-day gain on record, surging 18% in one session as SK Hynix hit its 30% daily trading limit and Samsung Electronics climbed 27%, according to Zoom Bangla iNews. The explosive move came after three brutal days of losses and was fueled by a short squeeze tied to an overnight rally in US tech stocks.
The rebound did not erase all the damage. SK Hynix had fallen roughly 58% from its June 25 peak before the surge. Analysts cautioned that the rally reflected technical market forces more than a genuine earnings recovery.
Short Squeeze Ignites Record-Breaking Single-Day Surge
The catalyst was simple: US tech stocks rallied hard overnight, and short sellers panicked. Short selling means betting a stock will fall. When prices jump instead, those sellers must buy shares quickly to cut their losses. That rush of forced buying pushed SK Hynix and Samsung to their daily price limits, according to Zoom Bangla iNews. The KOSPI's 18% gain was the biggest single-day move in the index's history.
Before the squeeze, SK Hynix's slide had already caused chaos. On July 13, the stock dropped 15% in one day. That triggered forced selling in leveraged ETFs — funds that use borrowed money to amplify bets. About $5 billion left those ETFs, making up roughly 18% of SK Hynix's total trading volume that day.
Amazon and Microsoft Earnings Revive AI Chip Demand Hopes
Strong earnings from Amazon and Microsoft gave investors a reason to buy Korean chips again. Both companies signaled they would keep spending heavily on AI infrastructure. That boosted hopes for memory chip demand, since AI data centers need massive amounts of the chips that SK Hynix and Samsung make, according to GuruFocus and CNBC.
The optimism spread beyond the two giants. LG Innotek and Seoul Semiconductor also rallied sharply, suggesting broader confidence in Korea's chip sector. By July 31, SK Hynix and Samsung were up over 20% again in a follow-on session, according to Seoul Daily. The SOXX US semiconductor ETF also rose more than 8% alongside the Korea rally.
Circuit Breakers Trigger Back-to-Back for First Time Ever
The volatility cut both ways. On July 28 and 29, the Korea Exchange triggered circuit breakers two days in a row for the first time in its history. A circuit breaker is a temporary trading halt that kicks in when prices move too fast. The back-to-back triggers came during a sharp Asia-wide semiconductor sell-off that produced a 10.84% single-day drop on July 28.
Part of the earlier slide was driven by fear. Investors worried that Chinese memory chipmakers were closing the technology gap with Korean rivals. That fear pushed sellers into the market hard and fast, creating the conditions for the violent short squeeze that followed when sentiment shifted.
Analysts Warn Rally Looks Technical, Not Fundamental
Despite the record moves, experts urged caution. The KOSPI remained well below its June peak even after the surge. The rally looked more like a positioning squeeze than a sign of real earnings strength, analysts said. Short squeezes can reverse just as fast as they develop when the forced buying stops.
GuruFocus flagged a specific warning sign: the SOXX semiconductor ETF appeared roughly 50% overvalued based on GF Value metrics. That signal suggested the AI chip trade had run far ahead of actual fundamentals. Investors piling into the sector at current prices faced significant risk of a correction if earnings failed to catch up with expectations.
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