Applied Optoelectronics (AAOI) experienced a significant pre-market plunge of 5.35% on Friday, as investors reacted negatively to a major capital markets announcement from the optical networking components maker.

The sharp decline came after the company disclosed 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 typically raise concerns about potential shareholder dilution, as they increase the supply of shares in the market.

Market participants reacted swiftly to the news, driving the stock lower in pre-market trading as they weighed the implications of the substantial capital raising plan against the company's future growth prospects and capital needs.