Optical connectivity stocks have posted large gains in 2026, but a 9% pullback over the past month suggests the window for a clean exit may be closing. Applied Optoelectronics (NASDAQ:AAOI) is up 175% year to date, Lumentum (NASDAQ:LITE) is up 164% and Coherent (NYSE:COHR) is up 55%, while the iShares Semiconductor ETF (NASDAQ:SOXX) is up 79% and the SPDR S&P 500 ETF Trust (NYSEARCA:SPY) is up 14%. Supporters argue that transceiver demand follows AI cluster construction that is already committed. The bear case centers on scale and pricing, as Applied Optoelectronics is a small manufacturer competing against far larger suppliers on a product that commoditizes as speed generations age. The key question is whether its order book holds through the next transceiver speed transition.
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