COHR: AI Optics Star Faces Execution Test

What happened

Coherent has surged 337% in the past year driven by AI datacenter optics demand and a $2 billion NVIDIA deal, but the stock recently dipped as valuation stretched and investors await proof of capacity ramp conversion. The latest quarter showed Datacenter & Communications revenue growing 41% year over year, yet operating cash flow remained minimal due to heavy inventory builds and capital spending. The company is expanding internal indium phosphide capacity to address shortages, but success depends on converting this investment into sustained free cash flow. The market is now focused on near-term proof points: InP capacity doubling next quarter and CPO revenue starting in the second half of 2026. Without clear evidence of improving cash conversion and margin stability, the stock's high multiple leaves little room for error.

Implication

Investors should wait for two consecutive quarters showing Datacenter & Communications growth above 25% year over year alongside stable or declining inventory, indicating the capacity ramp is converting to cash. The attractive entry point is around $320, offering a better risk/reward given the base case valuation of $380. The NVIDIA agreement provides visibility but also concentration risk, and the non-exclusive structure limits pricing power. Monitor the next quarterly report for evidence of InP capacity expansion and gross margin traction. Position sizing should be limited until free cash flow credibility is restored; the re-assessment window is 3-6 months.

Thesis delta

The thesis remains unchanged: Coherent is a wait-and-see at current levels. The recent dip does not alter the need for operational proof; if anything, it reflects market skepticism that the ramp will convert smoothly. The $2B NVIDIA deal adds a floor to demand visibility but also increases concentration and capital intensity, raising the execution bar.