SK Hynix stock fell 15.4% in Seoul on Monday, the worst single day since the memory-chip maker began trading in 1997 [1]. The plunge dragged South Korea's Kospi index down 8.9%, and it landed three trading days after the same company staged one of the year's loudest debuts.

That debut is the record the paper covered on July 10, when SK Hynix raised roughly $26.5 billion listing shares in the United States and separated a market open from HBM4 manufacturing execution. Those U.S. shares jumped 13.1% on Friday and gave back 9.3% on Monday [1]. The company that looked like AI's validation on Friday looked like its warning by Monday's close.

AP attributes the reversal to a specific fear, not a verdict: worries that AI stocks "have shot too high" and that memory demand "may not be sustainable if AI doesn't deliver as much profit and productivity as expected" [1]. The company's shipments moved the other way. SK Hynix said June revenue rose nearly 68% from a year earlier, lifting first-half growth to 35.6% [1]. Micron fell 4.4% on the day, trimming a 243.1% gain for the year; Nvidia fell 3.5%, the single heaviest weight on an S&P 500 that lost 0.8% to 7,515.34 [1].

Feeds read the 15.4% drop as the AI trade breaking; the numbers show a price falling against rising sales, a repricing of expectations rather than a collapse in what the factories shipped. Which reading holds will not settle until later filings and delivered HBM4 arrive.

-- CAMILLE BEAUMONT, Los Angeles