South Korean stocks rallied sharply on Thursday, August 13, pushing the benchmark Kospi index into technical bull-market territory in just over a month — a dramatic reversal fueled by a global revival in the AI trade after last month's historic tech-driven sell-off.
The Numbers Behind the Rebound
The Kospi jumped as much as 4.8% intraday on Thursday, extending its rebound from its July 30 low to roughly 22-23%, according to LSEG data — comfortably clearing the 20% threshold commonly used to define a technical bull market. Index heavyweights Samsung Electronics and SK Hynix led the charge, both climbing more than 5% intraday, with SK Hynix at one point up as much as 7%. Together, the two chipmakers drive nearly 30% of the index's overall movement, underscoring just how concentrated this rally really is.
What's Driving the Turnaround
The rebound traces back to a punishing sell-off in July, driven partly by leveraged positions and forced selling that pushed the Kospi into bear-market territory. Since then, several factors have combined to fuel the sharp recovery: strong earnings from major US technology companies reaffirmed continued heavy spending on AI infrastructure, with Supermicro and cloud provider CoreWeave both climbing on better-than-expected results. Wednesday's benign US CPI report also eased concerns over further Federal Reserve rate hikes, providing a supportive macro backdrop. On the domestic side, South Korea's government tightened regulation of single-stock leveraged ETFs, and a decline in margin trading helped stabilize the market after July's forced-selling spiral.
Is the AI Trade Really Regaining Strength?
The bullish case rests heavily on renewed confidence in memory-chip demand. Fundstrat Global Advisors said the rally could have further room to run as strength returns to Korea's heavyweight memory-chip makers, with the firm's head of technical strategy, Mark Newton, noting that the iShares MSCI South Korea ETF has broken above a key technical level, confirming a reversal pattern he described as "attractive technically for further near-term gains." Fundstrat also flagged that memory shares — among the hardest-hit names during the recent tech sell-off — are beginning to outperform the broader technology sector for the first time since June.
David Morrison, senior market analyst at Trade Nation, put it more bluntly: "The AI spending boom is far from over," pointing to strong results from US AI-related companies as evidence the underlying demand story remains intact rather than fading.
A Rally Built on a Narrow Foundation
Not everyone is fully convinced the rally reflects a durable shift rather than a technical bounce. Phillip Wool, head of research at Rayliant Global Advisors, noted that "Korea's equity market is basically synonymous with the AI hardware trade at this point," and cautioned that part of the rebound has been mechanical — forced selling subsiding, dip buyers returning, and fear of missing out taking hold, rather than purely fundamentals-driven buying. Still, Wool acknowledged that stronger-than-expected Big Tech earnings have reinforced expectations for AI infrastructure spending and helped drive upward revisions to growth forecasts for Korean hardware companies.
He also flagged the risks that could quickly unwind the rally: "Anything that calls this narrative into question, whether it's soft guidance on capex from hyperscalers, sagging token pricing, Fed tightening fears, we can expect to see a pullback." Given the Kospi's outsized dependence on a small handful of semiconductor names, analysts widely agree that continued volatility is likely as long as uncertainty persists around the pace and durability of global AI hardware spending.
How This Compares Regionally
The Kospi's sharp reversal stands out against a more mixed picture elsewhere in Asia. Japan's Nikkei has been comparatively choppy in recent sessions, Chinese tech stocks remain under regulatory pressure, and Taiwan's market faces its own valuation concerns despite continued strength from TSMC — making Korean equities look, for now, like a relative value play within the region's AI hardware trade.
What to Watch Next
With the rally so heavily concentrated in Samsung and SK Hynix, the durability of this bull run will likely hinge on upcoming earnings from major hyperscalers, any signs of softening AI capital expenditure guidance, and how memory-chip pricing trends evolve in the coming months. For live Kospi index data and market updates, see the Korea Exchange.
For now, the speed and scale of the Kospi's reversal offers a striking real-time test of just how far AI-driven optimism can carry a market — and how quickly that same optimism could reverse if the underlying spending story falters.