Applied Opto shares fall 3.5% postmarket

Applied Optoelectronics (AAOI) shares fell 3.5% in postmarket trading on August 21, 2026, following the release of its second-quarter 2026 financial results and updated revenue guidance for the third quarter. The company reported higher sales but also wider losses, raising questions about its path to profitability amid aggressive capacity expansion efforts. Despite the recent decline, the stock has delivered strong returns over the past 30 days, with an 18.61% gain, reflecting ongoing investor optimism around its role in AI infrastructure and data center networking.

AAOI’s current valuation remains elevated, trading at approximately 14x to 15x trailing sales and 6.5x forward sales if the company meets its $1 billion revenue target for 2026. Analysts and investors are closely watching the company’s ability to scale its 800G and 1.6T optical components, as well as its progress toward improving gross margins and achieving profitability. Any delays or setbacks in these areas could weigh on investor sentiment.

The stock’s price-to-sales ratio of 18.5x remains significantly higher than the communications industry average, suggesting that investors are paying a premium for its growth potential. While some models indicate the stock may still be undervalued relative to its growth profile, the recent volatility highlights the market’s cautious stance amid high expectations.