Asian markets just had a rough session. Over $650B in market cap evaporated overnight as semiconductor and tech stocks got hammered.

South Korea's KOSPI down 5.5% — lost $186B
Japan's Nikkei off 3.1% — shed $232B
China's SSE down 2% — wiped $180B
Taiwan down 1.5% — dropped $55B

Semiconductor names took the brunt of it. These are the same stocks that led the rally for months. When they roll over, the damage spreads fast.

This kind of selling usually doesn't stay contained to one region. Watch how U.S. chip stocks and tech open today. If Asia's weakness bleeds into our session, we could see follow-through pressure on $NVDA, $TSM, $AMD, and the broader $SMH ETF.

Market structure matters. When leadership falters, rotation can get messy before it stabilizes.