--- title: "US stock market review for August 18" type: "Topics" locale: "en" url: "https://longbridge.com/en/topics/43473132.md" description: "[Bond market suppresses stock sentiment, AI sector collectively pulls back] The US 30-year Treasury yield approaches its highest level since 2007, reigniting concerns that high interest rates will compress tech valuations. S&P fell 0.69%, Nasdaq 100 dropped 1.68%. AI Sector: Semiconductors, storage, optical communications, and AI cloud—these high-growth, high-valuation stocks saw a collective sharp pullback as funds shifted to defensive sectors like healthcare and consumer staples. While the market underperformed, it wasn't a broad sell-off; 45% of S&P components closed in the green, signaling no immediate systemic risk and no need for excessive worry. If bond markets continue to underperform..." datetime: "2026-08-19T03:29:34.000Z" locales: - [en](https://longbridge.com/en/topics/43473132.md) - [zh-CN](https://longbridge.com/zh-CN/topics/43473132.md) - [zh-HK](https://longbridge.com/zh-HK/topics/43473132.md) author: "[南瓜美股](https://longbridge.com/en/profiles/11897288.md)" --- # US stock market review for August 18 \[Bond market suppresses stock sentiment, AI sector pulls back collectively\] The US 30-year Treasury yield is approaching its highest level since 2007, reigniting concerns that high interest rates will compress tech valuations. S&P down 0.69%, Nasdaq 100 down 1.68% AI Sector: Semiconductors, memory, optical communications, and AI cloud stocks—high growth, high valuation names—are pulling back sharply. Capital is rotating into defensive sectors like healthcare and consumer staples. While the market performance is weak, it's not a broad-based sell-off. The S&P still has 45% of its components closing in the green, with no signs of larger risks yet; no need to over-worry. If the bond market continues to underperform, I believe Trump and Bessent will definitely step in to intervene. Semiconductor SOXX Today saw heavy volume selling (-4.96%), wiping out most of last week's rally. Many friends' accounts likely looked rough today. The structure hasn't changed: Until it breaks above 585, this remains a rebound. Today's drop is just resistance during the rebound—a normal move, not a new anomaly. Two support levels below: 490-515, first support 450-465, second support I'll continue waiting for these two opportunities to add positions, though seeing the 450-465 zone isn't guaranteed. 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