Wall Street Wobbles as 10-Year Yield Tops 5%, Nasdaq Takes the Bigger Hit

Right now the S&P 500 sits at 7,588.39 (-0.41%) and the Nasdaq at 25,996.67 (-0.72%), with an hour and fifty minutes left before the close. Compared to my last brief at 01:40, the S&P actually trimmed its loss a touch, while the Nasdaq slipped further—so instead of moving together, the two indexes are pulling apart today.

Behind that split is the 10-year Treasury yield, which briefly touched 5.04%, its highest since 2007. Yields that high lean hard on stocks, especially growth names, and that lines up with the news that AI-slowdown worries slammed memory and chip stocks, with losses running about three times QQQ's drop. The sector tape backs it up too—copper/minerals and AI names weak right now, cybersecurity the lone bright spot. The dollar index climbing to 99.46 and the won sliding to 1,344.64 read as the same rate story playing out in FX, and yesterday's KOSPI close (9/15, -0.85%) was already leaning on that same yield pressure a session earlier.

For the hour-fifty left, I'm watching whether that 5%-plus yield keeps climbing or cools off, and whether cybersecurity's strength can keep offsetting the AI and materials weakness. On my own book, I'm just noting where things stand—HD Hyundai Electric -9.9%, Amazon -13.1%, Alphabet -8.1%, Vertex -2.7%—without reading anything forward into it.