ACM Research Inc.'s stock plummeted 5.54% during Tuesday's intraday trading session. The sharp decline coincided with the company's announcement of a new share issuance.

The semiconductor equipment maker priced a registered direct offering of 2,884,615 shares of its Class A common stock at $52.00 per share. The company entered into a securities purchase agreement with U.S. institutional investors, with net proceeds expected to be approximately $149.85 million. ACM Research stated the funds are earmarked for U.S. and global expansion, as well as general corporate purposes.

Such offerings often lead to share price pressure due to the dilution of existing shareholders and the potential for the offering price to be set at a discount to the prevailing market price. The transaction is expected to close on or about May 15, 2026, and includes a standard six-month lock-up period on the newly issued shares.