AI optics lift MACOM, but execution matters
- Management lifted FY26 Data Center growth guidance to over 60%, a sharp jump from the prior 35% to 40% range.
- Q2 FY26 revenue was $289.0 million, with Data Center at 34.0% of sales.
- Bookings were strong at 1.5:1 book-to-bill, giving better near-term demand visibility.
- The IQE investment helps secure indium phosphide and silicon carbide supply, but it still carries capital allocation risk.
- Finn's score points to a solid operator, while the stock price still needs growth to show up.
AI optics now lead the story
MACOM has become a clear winner from the AI data center buildout. Its chips help move data at very high speeds inside optical links. Management raised FY26 Data Center growth guidance from 35% to 40% to over 60%, which is a large step up in confidence.
The near-term setup looks strong. Q2 FY26 revenue was $289.0 million, and Data Center revenue was $98.2 million. Management also guided for about 35% sequential Data Center growth in Q3 and said bookings were at a 1.5:1 book-to-bill ratio, meaning orders were much higher than shipments.
The catch is execution. MACOM must add capacity, move technologies like GaN4, and protect margins while demand is rising. The stock also needs the growth to keep coming, since Finn's valuation score is only middle of the pack. This is not a cheap turnaround story. It is a growth and execution story.
Special chips for hard jobs
MACOM designs and makes analog and mixed-signal semiconductors. These are chips that handle real-world signals, such as radio waves, light signals, and high-speed electrical pulses. Customers use them inside larger systems for defense radar, satellites, fiber networks, 5G gear, and AI data centers.
The company sells thousands of standard and custom parts to more than 6,000 end customers through its own sales team, outside sales reps, and distributors. Its edge comes from deep know-how in compound semiconductors such as GaAs, GaN, and InP, plus advanced packaging. These materials can handle high speed, high power, or high frequency jobs better than normal silicon in many uses.
The model breaks if MACOM cannot turn demand into shipped parts at good margins. Capacity, wafer supply, and manufacturing transfers matter a lot. That is why the IQE investment is important. It is meant to secure key outside supply, not simply add another financial asset.
Where the chips fit
800G and 1.6T PAM4 chipsets
These chips help optical modules move data faster in AI data centers. Management said Data Center strength was driven by higher sales of products supporting speeds up to 1.6T.
200G per lane photodetectors
Photodetectors turn light signals back into electrical signals. MACOM moved 200G per lane photodetectors into high-volume production in FY2025.
Linear Pluggable Optics chipsets
LPO tries to reduce power and complexity in optical links. Management said MACOM is in various phases of production with three hyperscalers.
Drivers, TIAs, and CW lasers
These support customers that build their own silicon photonics systems. MACOM is stepping back from commercial silicon photonics itself, but still sells key helper chips into that market.
Industrial and defense RF products
This group includes amplifiers, switches, diodes, and other RF and microwave parts. It remains the largest reported end market by revenue in Q2 FY26.
GaN4 telecom products
GaN is a compound semiconductor used for high-power radio frequency chips. MACOM is sampling next-generation GaN4 products to 5G base station customers.
PCIe 6 and 7 equalizers
Equalizers help clean up fast electrical signals. These products give MACOM more exposure to the compute side of the data center, not only optical links.
Q2 FY26 revenue mix
The mix is from the fiscal second quarter ended April 3, 2026. Industrial & Defense is still the largest end market, but Data Center is growing fastest and is changing the company mix.
What could break the thesis
Data Center growth cools
High impact · Medium oddsThe bull case leans on FY26 Data Center growth of over 60%. If that growth is mostly a short AI optics surge or a few big customer ramps, the FY27 base could be harder. MACOM needs to show that 800G, 1.6T, 200G per lane, and LPO demand can stay strong.
Factory expansion hurts margins
High impact · Medium oddsMACOM is adding capacity and managing fab transfers while demand is rising. Earlier, management warned that the accelerated RTP fab transfer would create about a 60 basis point near-term gross margin setback in Q4 FY25. The next test is whether the company can exit FY26 near 60% adjusted gross margin.
SATCOM ramp slips again
Medium impact · Medium oddsA large satellite program is expected to ramp in calendar 2027. That timing helps explain why Telecom may not step up right away. Another delay would weaken one of the cleaner FY27 growth drivers.
IQE investment disappoints
Medium impact · Medium oddsMACOM agreed to invest £30.0 million in IQE equity and £15.0 million in convertible notes. The reason is clearer now: securing supply of materials such as indium phosphide and silicon carbide. The risk is that the deal does not deliver enough supply security or financial return.
Policy and export rules change
Medium impact · Medium oddsMACOM has warned that U.S. government changes could affect trade policy, tariffs, export controls, and CHIPS Act funding. This matters because the company sells into defense, telecom, and high-performance semiconductor markets. A funding change could alter strategic investment plans.
In one breath
Why is MACOM tied to AI?
AI data centers need fast optical links to move huge amounts of data. MACOM sells chips used in high-speed optical modules, including products for 800G and 1.6T systems.
What are MACOM's main markets?
MACOM reports three end markets: Industrial & Defense, Data Center, and Telecom. In Q2 FY26, they were 41.8%, 34.0%, and 24.2% of revenue.
Is MACOM still a silicon photonics company?
Management has said MACOM is stepping back from the commercial silicon photonics market. It still sells supporting parts such as drivers, TIAs, and CW lasers to customers using their own silicon photonics designs.
What is the biggest thing to watch next?
The key test is whether MACOM meets the new over 60% FY26 Data Center growth guide without losing margin progress. The next signal is Q3 Data Center growth versus management's 35% sequential growth guide.