SK Hynix ADR Plummets 21.5% in Two Days; Philadelphia Semiconductor Index Falls 4.3%

On July 16, SK Hynix ADR plunged 21.5% in two days, closing at $152.31, according to market data. The Philadelphia Semiconductor Index dropped 4.3%, with Micron, Intel, and AMD each declining 5–6%.

TSMC reported a 77% increase in second-quarter net profit but its ADR fell 2.3%, suggesting market concerns over peak semiconductor valuations despite strong earnings. The semiconductor sector has risen approximately 70% this year, with its weight in the S&P 500 exceeding 20%, compared to 8% three years ago.