Global AI Stock Selloff Hammers Hedge Funds as KOSPI Plunges to Six-Month Low

Global markets were rattled this week as an AI stock selloff hammered hedge funds, with Asia-focused managers suffering the heaviest losses, according to a Goldman Sachs prime brokerage note reported by Reuters on Thursday.

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• Global fundamental long-short funds — stock pickers — lost money every single day this week, falling 2.9 percent in the week to October 15, Goldman Sachs data shows.
• Asia-focused hedge fund managers were hit hardest, losing 2.6 percent on Wednesday alone and 6.8 percent in the first half of October.
• South Korea’s benchmark KOSPI tumbled nearly 8 percent on Thursday to a six-month low, triggering a circuit breaker that halted trading for 20 minutes.
• Samsung Electronics fell 9.5 percent and SK Hynix plunged about 11 percent; Japan’s Nikkei dropped nearly 5 percent and Taiwan’s Taiex slid 3.4 percent.
• Hotter-than-expected US inflation — September consumer prices rose 3.7 percent year-on-year — reignited fears of further Federal Reserve rate hikes.

Trading screens during the selloff that hammered hedge funds across global markets this week.

How the AI stock selloff hit hedge funds

The Goldman Sachs note, cited by Reuters, shows the pain was broad and synchronized. On Wednesday, hedge funds across strategies retreated sharply: global stock pickers lost 0.9 percent, tech-focused funds fell 2.0 percent, and global systematic long-short managers and multi-strategy funds each declined roughly 1 percent.

The bank noted that from the start of the COVID pandemic through the end of 2025, all three broad strategies never fell more than 0.8 percentage points on the same day. That has now happened three times in 2026 alone — on February 4, July 28 and October 15 — a sign of how concentrated and crowded the AI trade has become.

Asia-focused stock pickers have been the epicenter of the damage. Down 6.8 percent in the first half of October, they have erased more than half of the gains from their late-June peak, when they were up more than 40 percent for the year, according to Goldman Sachs.

Asia’s chip-heavy markets bore the brunt

Semiconductor-heavy markets took the worst of the selling. South Korea’s KOSPI closed around 5,550 — down roughly 7.6 to 8 percent — its lowest close since April and its seventh consecutive drop. The scale of the decline triggered a circuit breaker, temporarily halting trading on the exchange, reportedly the tenth such halt this year against only 16 in the index’s entire history.

Samsung Electronics slid 9.5 percent and memory-chip maker SK Hynix plunged about 11 percent. Japan’s Nikkei 225 tumbled nearly 5 percent, with OpenAI investor SoftBank Group losing more than 9 percent, chip-equipment maker Tokyo Electron dropping around 7 percent, and memory maker Kioxia down more than 11 percent. Taiwan’s Taiex fell 3.4 percent.

Even Taiwan’s TSMC — the world’s largest maker of advanced semiconductors, which reported a sixth consecutive quarter of record net profit, up 69 percent year-on-year — saw its shares fall about 2 percent after executives sounded a cautious note on rising component prices, macroeconomic uncertainty and aggressive expansion plans.

What drove the rout

The selling followed a hotter-than-expected US inflation report: the consumer price index rose 3.7 percent year-on-year in September, up from 3.4 percent in August, pushing up expectations of further Fed rate hikes and lifting borrowing costs — a direct threat to the debt-financed AI infrastructure buildout.

Investors are also increasingly questioning whether massive AI spending can pay off anytime soon. Signs of slowing revenue growth at leading frontier AI labs added to the unease: at an investor presentation ahead of its planned IPO, Anthropic announced sales grew 45 percent to 17 billion dollars last quarter — strong, but a sharp slowdown from the second quarter, when growth had more than doubled. Growing competitive pressure from China, after Chinese chipmaker CXMT announced progress on advanced memory chips, added to market jitters.

“Worries about the AI buildout, bubbly valuations, lower-than-expected earnings growth at leading US frontier labs, Chinese competition, inflation and rates sent investors running for the covers,” Saxo strategist Neil Wilson wrote in a note cited by CNN.

Wall Street steadies, bonds rally

On Wall Street, markets recovered from early losses. The Dow Jones Industrial Average rose 1.08 percent, the S&P 500 gained 0.33 percent and the Nasdaq Composite edged up 0.08 percent, led by healthcare and materials stocks. The closely watched index of chip stocks is down roughly 20 percent since a peak in June, CNN reported.

Money moved into safe havens: benchmark 10-year US Treasury yields fell back toward 5 percent in their biggest daily drop in more than a year, as investors repriced the cost of capital and the sustainability of the AI spending boom.

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