ACM Research Inc. (NASDAQ: ACMR) stock plunged over 16% in pre-market trading on Monday, despite the semiconductor equipment company reporting strong earnings and revenue growth in its latest quarterly results.

The sell-off appears to be driven by broader market concerns and investor skepticism surrounding ACM Research's ability to sustain its rapid growth trajectory. While the company's financial performance has been impressive, with earnings per share growing by 40% annually over the past five years and revenues increasing by 40% year-over-year in the latest quarter, some analysts have raised concerns about the company's valuation and potential headwinds in the semiconductor industry.

According to a report by Zacks Investment Research, ACM Research is trading at a discount to its peers, potentially indicating that investors view the stock as overvalued. However, the report also noted that the company has consistently beaten earnings and revenue estimates, suggesting that its growth prospects remain strong.