Applied Optoelectronics (AAOI) experienced a significant 5.24% decline in its stock price during the night session. The drop came as the company made a major capital markets announcement that typically concerns investors about potential shareholder dilution.

The optical components manufacturer disclosed that it has established an at-the-market (ATM) equity distribution program that could allow it to issue up to $600 million worth of common stock. Such equity issuance programs often lead to stock price pressure as they increase the supply of shares in the market and dilute existing shareholders' ownership stakes.

Market participants reacted negatively to the news of the potential equity offering, driving the stock lower as investors weighed the implications of the substantial capital raising plan against the company's future growth prospects and capital needs.