The biggest risk is not product irrelevance; it is that the market already values Lumentum as a durable AI bottleneck before that durability is fully proven. If capacity expands across the industry, if a handful of customers regain bargaining power, or if
OCS and
CPO ramps slip, the business can still grow while the stock underperforms. The April 2026 debt exchange reduced financing stress, but customer concentration, capital intensity, and policy exposure remain meaningful.