South Korea KOSPI Bounces Back After Biggest Drop in Years as Samsung Surges 10%

TLDR

• South Korea’s KOSPI rebounded 3.3%–4.6% on Wednesday after crashing nearly 10% on Tuesday
• Samsung surged up to 10% on news of a planned $5.8 billion share buyback
• SK Hynix rose around 1%–3.4% after reports of a planned US ADR listing
• Tuesday’s crash was triggered by MSCI rejecting South Korea’s developed market status and AI trade doubts
• Despite the selloff, the KOSPI remains the world’s best-performing index, up nearly 100% year-to-date

South Korea’s stock market staged a strong recovery on Wednesday after one of its worst single-day crashes in recent memory. The KOSPI index climbed 3.3% to close at 8,471, having risen as much as 4.6% earlier in the session.

The rebound came just one day after the index plunged nearly 10% on Tuesday, wiping out billions in market value across tech and chip stocks.

Samsung Electronics led the recovery, surging between 7% and 10% during the session. The gains followed a Yonhap report that Samsung was preparing a share buyback worth around 90 trillion won, equal to roughly $5.8 billion.

SK Hynix also recovered, rising between 1% and 3.4%. Reports surfaced that the company was moving forward with a plan to list American Depositary Receipts in the US, a move that could attract significant foreign investment.

Both companies had shed more than 12% each in Tuesday’s session, making Wednesday’s bounce a partial but not full recovery.

What Triggered Tuesday’s Crash

Several factors hit South Korean markets at once on Tuesday. The most immediate was MSCI’s decision to reject South Korea’s application to be reclassified as a developed market, a status upgrade the country had been seeking.

Doubts about the AI trade also played a role. A report suggested SK Hynix was considering shifting focus away from high-bandwidth memory — the kind used in AI chips — toward more traditional memory products. That spooked investors who had bet heavily on AI-driven chip demand.

Leveraged exchange-traded funds made things worse. As prices fell, investors sold these funds quickly, amplifying the losses. South Korea’s top market regulator publicly expressed regret over approving the launch of those ETFs just last month.

Mixed Picture Across Asia

The wider Asian market picture on Wednesday was uneven. Japan’s Nikkei 225 fell 0.9%. Taiwan’s Taiex dropped 2.2%, with chipmaker TSMC closing 4% lower.

Hong Kong’s Hang Seng gained as much as 1%, bucking the regional trend.

Analysts noted that the volatility reflects how closely tied some of Asia’s biggest markets have become to global AI sentiment.

Chris Weston, head of research at Pepperstone, said the tech selloff partly reflected funds taking profits as the risk-reward balance shifted, especially in crowded AI and memory stock positions.

Michael Wan, an analyst at MUFG, said the longer-term outlook for the sector remains positive. He described current turbulence as early-stage noise in what he called a generational shift in technology.

Despite the sharp two-day swings, the KOSPI is still up nearly 100% year-to-date, making it the best-performing major stock index in the world in 2026.

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