Asian equity markets plunged today after an overnight tech-led selloff in the U.S. exposed stretched valuations and triggered a risk-off wave. Tokyo and Seoul led losses as semiconductor and AI-hardware names tumbled; volatility spiked to multi-week highs. Investors rotated out of megacaps into safe havens, pushing yields down and the dollar higher. Brokers say the move reflects valuation re-ratings rather than fresh macro shocks, and fund managers are trimming growth exposure while reallocating to value and defensive sectors ahead of upcoming macro data and earnings. Watch breadth and liquidity flows for confirmation.