Tuesday’s technology rout was triggered by a leverage shock in South Korea rather than a sudden break in AI demand. Samsung Electronics and SK Hynix dropped more than 12%, dragging the KOSPI down 9.99% and prompting a market-wide trading halt, before losses spilled into US memory names as Micron and SanDisk fell more than 13%. Positioning had been extended: retail buyers accumulated ₩79 trillion of KOSPI stock this year, while borrowed stock investment hit a record ₩29 trillion, up 71% from end-2025, with brokerages already at lending limits. With Samsung and SK Hynix accounting for more than half of index market value, regulatory warnings on leveraged single-stock ETFs helped turn foreign selling into a broader shock.

Attention now turns to whether the move becomes a deeper Nasdaq drawdown amid rising yields and a more hawkish Federal Reserve. Technical levels cited include KOSPI’s 8,610 midpoint, Nasdaq’s 29,600 and support near 28,196, while the dollar proxy UUP rebounded from the 61.8% retracement around $26.65 and is testing $28.45 as volume fades. Micron’s latest quarter reported $23.86 billion revenue, $12.20 adjusted EPS and a 74.4% non-GAAP gross margin; guidance for fiscal Q3 is $33.5 billion revenue, $19.15 adjusted EPS and 81% gross margin. Cash-flow detail showed $11.9 billion operating cash flow, $5.0 billion capex, $6.9 billion adjusted free cash flow and $8.27 billion inventory, with chart supports flagged at the daily 20-EMA near $984 and the 50-EMA near $812, alongside resistance gaps from $1,125 to $1,168.57. Thursday’s PCE inflation release is the next macro test.

—

Leverage Shock and Overextended Positioning in South Korea

We saw last week’s tech selloff was not about AI demand failing, but a leverage shock from South Korea. The KOSPI dropped nearly 10% after Samsung and SK Hynix plunged, forcing a market-wide halt. This unwinding of crowded retail positions quickly spilled over into our markets, hitting memory stocks like Micron hard.

The Korean market was clearly overextended, with retail borrowing for stocks hitting a record ₩29 trillion earlier this year. This leverage was highly concentrated in Samsung and SK Hynix, which had grown to over half the index’s value. The forced selling happened in an already crowded global semiconductor trade, making the entire market fragile.

Micron’s subsequent earnings report did beat expectations, with revenue hitting $34 billion for the quarter. However, the stock sold off as forward guidance hinted at moderating data-center demand and rising inventories. This suggests the bigger issue for us is crowded positioning and a peak growth narrative, not a fundamental failure of the AI story itself.

—

Macro Risks, Technical Levels, and Positioning for Volatility

For derivative traders, the Nasdaq’s failure to reclaim 29,600 after the Micron news is a significant warning sign. The index has confirmed a bearish island-top reversal pattern on the charts. We are now watching for a decisive break below the daily 20-EMA cloud, which would open the way to the next support level near 28,196.

The macro picture became more complicated with last week’s Core PCE inflation data coming in slightly hot at an annualized 2.9%. This was just above the 2.7% consensus, but enough to push Treasury yields higher and reinforce the idea the Federal Reserve will remain on hold. This renewed pressure on rates is a direct headwind for growth and tech valuations.

We’re also seeing this pressure in the US dollar, which acts as a key confirmation for our macro view. The dollar ETF, UUP, is now breaking out from its weekly double bottom pattern around the $28.45 level with expanding volume. A stronger dollar makes financial conditions tighter and adds another layer of risk for technology shares.

This setup suggests we should position for more volatility and potential downside in the coming weeks. We are looking at buying puts on major tech indices for downside protection or implementing bear call spreads to capitalize on the failure to break key resistance levels. Implied volatility has picked up from its recent lows, but it may still be cheap if this correction deepens.