A semiconductor-led selloff pushed the Nasdaq-100 within striking distance of a correction on Tuesday, as panic over artificial intelligence investment returns spilled from Seoul to Wall Street. The index closed 9.7% below its record high, one bad session away from the 10% threshold that marks a formal correction.
The trigger came from Asia. South Korea’s Kospi plunged nearly 11%, tripping its eighth circuit breaker of 2026 and recording one of the worst single-day performances of the year. The rout in Seoul’s notoriously volatile retail-driven market then cascaded into U.S. trading, where the Philadelphia Semiconductor Index (SOX) fell as much as 6% — a fourth consecutive losing session and the longest such streak this year.
Semiconductor Selloff Signals Deeper AI Anxiety
The chip sector’s decline reflects more than routine profit-taking. Semiconductor companies have been the primary beneficiaries of the AI infrastructure buildout, and their valuations have climbed on expectations of sustained capital expenditure from hyperscalers. When those stocks reverse sharply, it signals that investors are repricing the risk that AI spending may not deliver the revenue growth the market has priced in.
“A lot of panic around the AI investment,” one observer described the market mood — a sentiment that captures the shift from euphoria to doubt that has defined recent sessions. The Nasdaq-100’s 9.7% drop from its peak is not yet a correction, but the velocity of the decline suggests momentum has turned decisively negative.
South Korea’s Contagion Risk
The Kospi’s 11% plunge and its eight circuit-breaker halts in 2026 point to structural fragility in one of Asia’s most important markets. South Korea is home to the world’s largest memory chip manufacturers, making its equity market a proxy for global semiconductor demand. When retail traders there unwind leveraged positions, the shock travels fast.
Tuesday’s session demonstrated that transmission path clearly. The Kospi’s decline preceded and then amplified the SOX index’s losses, with U.S. chipmakers opening lower and failing to recover. The four-session losing streak for SOX is the longest of the year, erasing gains that had pushed the index to records earlier in 2026.
What Happens Next
If the Nasdaq-100 breaches the 10% correction line, algorithmic and systematic strategies will likely accelerate selling, potentially dragging the broader Nasdaq Composite and S&P 500 with it. Investors will be watching the next batch of semiconductor earnings and hyperscaler capital expenditure guidance for evidence that AI demand remains intact.
Central bank policy adds another variable. If rate-cut expectations firm up in response to market stress, risk assets could find a floor. But if inflation data stays sticky, policymakers may remain on the sidelines, leaving equity markets to absorb the chip selloff without a safety net. The next two trading sessions will determine whether this is a healthy pullback or the start of a deeper drawdown in the AI trade.
— Nadia Okonkwo, business desk, AXO News