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Why Semiconductor Equipment Stocks ASML Holdings, KLA, and Lam Research Plunged Today

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Shares of semiconductor equipment stocks ASML Holdings (NASDAQ: ASML), KLA (NASDAQ: KLAC), and Lam Research (NASDAQ: LRCX) were plunging on Monday, down 6.8%, 4.7%, and 6.7%, respectively, as of 3:52 p.m. ET

Semiconductor stocks are long-term growers, but they also have cyclical qualities as well. Therefore, today's fears over a tariff-induced recession is causing a big sell-off.

In addition, tariffs that increase trade tensions with China tend to especially complicate things for semiconductor stocks. This is because China is a big purchaser of chips, and its government is also investing heavily in domestic chipmaking alternatives, including homegrown semiconductor equipment stocks.

On that note, there was also a report today that China is developing an alternative to extreme ultraviolet (EUV) technology. That may have hit ASML especially, which currently has a monopoly on EUV and dominates lithography technology generally.

Recession fears, China tensions aren't a good recipe for semi stocks

Over the weekend, President Trump gave an interview to Fox News' Maria Bartiromo. Bartiromo asked Trump if he predicted a recession as a consequence of the tariffs his administration has implemented, and the additional tariffs it's still considering.

After the past few weeks' turmoil, investors were likely hoping for reassurance. Instead, Trump wouldn't say whether a recession would occur, nor did he give any reassurance he would change his tariff stance should such a slowdown occur, saying:

I hate to predict things like that. There is a period of transition, because what we're doing is very big. We are bringing wealth back to America. That's a big thing. And there are always periods of -- it takes a little time.

Those comments hit basically all economically sensitive stocks, which includes tech stocks, and especially semiconductor and other hardware stocks.

In addition, tariffs on China can doubly affect semiconductor stocks. This is because China is a huge buyer of chips, and its government is feverishly investing to develop more homegrown semiconductors. Therefore, restrictions on selling equipment to China, or greater restrictions on advanced artificial intelligence (AI) and memory chips, could lead China to blacklist U.S.-made semiconductors in retaliation.

Now, for some semiconductor categories, there aren't really alternatives to U.S.-designed semiconductors today. But for others, China could increasingly look to domestic alternatives, or potentially alternatives that are made in Europe or South Korea.