Sinking semi stocks are the 'canary in the coal mine,' market watcher warns

Semi stocks are getting knocked off their perch.

Semi stocks are getting knocked off their perch. The once high flying group sank more than 2 percent on Thursday, and the SMH ETF, which tracks the space, is now down more than 7 percent from 2018 highs.

Some strategists not only see further downside for the largely Asia-exposed companies, which have gotten caught in the trade war crosshairs, but view the decline as a warning for the broader economy.

Names like Micron, Advanced Micro Devices, Applied Materials and Lam Research sank Thursday. Micron saw the biggest drop – falling nearly 10 percent due in part to a warning from Morgan Stanley about demand for memory chips.

Boris Schlossberg, managing director of foreign exchange strategy at BK Asset Management, is concerned about the decline.

"I think we should be paying attention to this. Semis, if you believe the fact that semis lead the economy, they could be the canary in the coal mine in the sense that we are already seeing a lot of anecdotal evidence" that demand for chip stocks is slowing, Schlossberg said Thursday on CNBC's "Trading Nation."

That may be signaling the economy is seeing a slowdown. He would be cautious about stepping into what he sees as a "falling knife," particularly because September is traditionally the market's worst month of the year and trade tensions between the U.S. and China remain.

From a technical standpoint, several semiconductor charts still look sound, said Bill Baruch, president of Blue Line Futures.

Specifically, AMD and Nvidia are still sporting strong respective uptrends while Applied Materials and Micron are pushing lower. He'd avoid those two names.

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Trading Nation is a multimedia financial news program that shows investors and traders how to use the news of the day to their advantage. This is where experts from across the financial world – including macro strategists, technical analysts, stock-pickers, and traders who specialize in options, currencies, and fixed income – come together to find the best ways to capitalize on recent developments in the market. Trading Nation: Where headlines become opportunities.

Sara Eisen

Sara Eisen joined CNBC in December 2013 as a correspondent, focusing on the global consumer. She is co-anchor of the 10AM ET hour of CNBC's "Squawk on the Street" (M-F, 9AM-11AM ET), broadcast from Post 9 at the New York Stock Exchange.

In March 2018, Eisen was named co-anchor of CNBC's "Power Lunch" (M-F, 1PM-3PM ET), which broadcasts from CNBC Global Headquarters in Englewood Cliffs, N.J.

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