Coherent Just Dropped 19% in a Week, Lumentum 16%. Is It Time to Sell, or Load Up?

Key TakeawaysCoherent shares fell 19% in the past week and Lumentum fell 16%, as AI optics stocks sold off after a hot September inflation report. Coherent put out no news except its earnings date, and analysts’ revenue estimates for fiscal 2027 and 2028 held up through the selloff.