CoreWeave Results Send Optical Stocks Up: AAOI +12%, Lumentum +11%

Applied Optoelectronics traded at $54.03, up 12%, shortly after the open on November 11, as CoreWeave's quarterly beat revived buying across optical networking stocks. Lumentum followed at $651.43, up 11%. Coherent, the most diversified of the three, lagged at $228.62, up 7%. All three build the optical transceivers and lasers that move data between AI chips and servers over fiber, so their fortunes track data center spending.

What did CoreWeave actually report?

CoreWeave beat expectations with its Q3 2026 results after the close on November 10. The GPU cloud provider also raised its 2026 guidance. A plan to fund growth through contract financing and upfront customer payments eased fears about how the AI buildout gets paid for.

Chip, data center and memory names climbed on the update. Coherent and Lumentum ranked among the notable gainers.

The rally faces a hostile macro backdrop. Chicago Fed President Austan Goolsbee called the latest inflation report "borderline disturbing" while the Fed weighs further rate hikes. That context turns the move in Applied Optoelectronics and its peers into a test of how much rate risk AI-related stocks can absorb.

How steep was the prior slide?

The bounce follows a rough stretch. Applied Optoelectronics fell 7% on November 10, the deepest drop of the three. Coherent slid 5% the same day. Lumentum dipped only 2%.

All three names were already coming off a steep one-month decline, with Applied Optoelectronics down the most. Bigger swings in both directions fit a smaller company that depends on a small number of customers. Lumentum's rebound roughly matches Applied Optoelectronics after the shallowest pullback of the group. Coherent posts the smallest gain, partly because its Industrial segment sits outside the AI spending wave.

Applied Optoelectronics has its own news. The company guided on November 5 for Q4 2026 revenue of $385 million to $420 million. It also disclosed a multi-year agreement with a Tier 1 hyperscale datacenter customer. Guidance is a promise, not a shipment; the customer's name and contract value remain undisclosed.

Why does the FCC's transceiver ban matter?

Reuters reported on November 10 that Microsoft is lobbying the Trump administration to drop a planned ban on new Chinese optical transceivers. The Federal Communications Commission is drafting the ban over security concerns. Chinese companies make about two-thirds of the world's transceivers, according to Counterpoint Research. Reuters named Coherent as a U.S. maker that could fill the gap.

Coherent CEO Jim Anderson said on the company's November 4 call that calendar 2027 is "basically booked out" and that customers are already booking calendar 2028. That suggests a ban would add pricing power for Coherent more than near-term volume.

There is a catch. Two Reuters sources said the FCC is weighing a 3.2-terabit-per-second threshold. That would hit faster parts not expected to ramp until 2028. Whether the ban happens at all remains open.

How do the three companies differ?

Applied Optoelectronics is the smallest. It is a vertically integrated transceiver maker that builds its own lasers and also sells into cable TV broadband networks. Lumentum focuses exclusively on optical components and systems, with pump lasers and optical circuit switches leading its growth.

Coherent is the most diversified, spanning datacenter optics, industrial lasers and engineered materials such as indium phosphide and silicon carbide. Those structural differences help explain why Applied Optoelectronics swings harder than its larger peers.

What comes next?

Applied Optoelectronics faces a capacity question. The company disclosed a seven-month delay in its Phase 2 Texas expansion, tied to electrical power and construction issues. Its Q3 GAAP profit also depended on $8.2 million of other income, against an operating loss of $1.44 million.

Optimists can cite Coherent's Datacenter & Communications revenue, up 79% year over year in Q1 FY2027, and Lumentum's Q2 FY2027 revenue guidance of $1.575 billion to $1.625 billion. The bears counter with the one-month decline, inflation pressure that could keep rates higher, and an unresolved FCC ruling. Until the Chinese transceiver decision settles, the optical rebound rests on one strong quarter from a GPU cloud provider.