MACOM Technology (MTSI)

RF + photonics semiconductors (MACOM) — RF/microwave + optical chips for data center + defense

AI exposure 33% — derived from reported segment revenue, not asserted.

Deep-dive research

MACOM: The RF-to-Light Compounder Hiding Inside the AI Infrastructure Boom — a single-company deep dive with its full slide deck, published on Frontier Macro & Markets, 2026-08-21.

Where it sits

Connectivity → Optical Components & Photonics · figures rebased to FQ3 FY2026, reported 2026-08-06

Data Center is 40.2% of revenue and now MACOM's largest end market — $137.584M in Q3 FY2026, ahead of Industrial & Defense at 39.0% — and it is where the 50G-to-1.6T optical franchise sits, so Optical Components & Photonics carries the primary on both readings. This used to need a documented exception: MACOM reports by end market, Industrial & Defense was the largest at 43%, and rule 2 read literally would have filed the company under analog ICs while rule 1 said place by what it makes. Data Center overtaking Industrial & Defense removes the conflict, and the exception with it. Both other legs are tagged secondary at full weight in their own product sub-tiers. Rebased 2026-09 to the Q3 FY2026 10-Q.

Also tagged: secondary in Silicon Layer → Analog, Logic & Mixed-Signal ICs; secondary in Connectivity → Wireless & Mobile Networks.

Reported segments

• Industrial & Defense (end-market) — 39% of revenue
• Data Center (end-market) — 40.2% of revenue
• Telecom (end-market) — 20.8% of revenue

MACOM reports by END MARKET rather than by product, which is what makes its placement awkward. Rebased to the Q3 FY2026 10-Q (quarter ended July 3, 2026, revenue $342.2M): Data Center $137.584M = 40.2%, Industrial & Defense $133.390M = 39.0%, Telecom $71.263M = 20.8% — the Atlas had 32/43/25. Data Center is now MACOM's largest end market, which changes the placement argument: rule 2 read literally used to point at Industrial & Defense and needed a documented override, and now it points at Data Center, where the 50G-to-1.6T optical franchise sits and where the primary already was. The…

How the 33% is built

• Industrial & Defense (end-market) — 39% of revenue × 5% AI-driven (estimate). Estimate, unchanged. Radar, defense and industrial RF/microwave content has no AI-infrastructure linkage
• Data Center (end-market) — 40.2% of revenue × 75% AI-driven (estimate). Estimate. Raised from 65 because the FY2026 data-center growth outlook was raised from over 40% to over 60% with ~35% sequential growth guided, and management attributes it specifically to 800G and 1.6T optical connectivity, photodetectors and pluggable-module production — the interconnect layer of GPU clusters. MACOM…
• Telecom (end-market) — 20.8% of revenue × 5% AI-driven (estimate). Estimate, unchanged. Carrier/metro optical and wireless backhaul demand is largely independent of AI cluster buildouts

Investment read

Moat. Owned RF/microwave and InP photonic fabs — a scarce process asset behind the 1.6T optical ramp — plus design-locked defense and telecom sockets. Contested at the top end by Marvell's InP platform and Coherent, which is what keeps this narrow rather than wide.

Bottleneck / pricing power. Stronger than 'moderate': adjusted gross margin 59.7% in FQ3 2026 with FQ4 guided to 60.0-61.0%, and adjusted operating margin up 630bps YoY to 31.5% as fab utilization ramps. The owned-fab margin thesis is now delivered rather than promised.

Role in the AI stack. The RF/photonic-IC layer for optics + defense.

Connected companies

• Keysight Technologies (KEYS) — MTSI supplies: MACOM foundry PDKs (GaN/GaAs models) integrated into Keysight ADS design software — design partnership
• Analog Devices (ADI) — MTSI competes with: RF/microwave/analog chips — MACOM vs Analog Devices (per company competitor list)
• Marvell Technology (MRVL) — MTSI competes with: data-center optics driver/TIA rivalry — MACOM vs Marvell (Inphi), neck-and-neck in 400G+ analog front-end
• Credo Technology (CRDO) — MTSI competes with: adjacent data-center connectivity — MACOM (drivers/TIAs/lasers) vs Credo (AECs/retimers/SerDes); overlap mainly at optical-DSP margin
• Nokia (NOK) — MTSI supplies: optical/RF components (laser drivers, TIAs) into telecom transport equipment; Nokia not publicly named as a customer
• Coherent (COHR) — MTSI supplies: laser drivers / TIAs / lasers — component supplier into optical-module maker
• Lumentum Holdings (LITE) — MTSI supplies: laser drivers / TIAs / lasers — component supplier into optical-module maker
• Fabrinet (FN) — MTSI supplies: laser drivers / TIAs / lasers — component supplier into optical-module maker
• Microsoft (MSFT) — MTSI supplies: analog/photonic ICs inside optical modules and cables deployed in hyperscale DCs (indirect; no named Microsoft tie)
• Meta Platforms (META) — MTSI supplies: optical-module chips (TIAs/drivers/lasers) reaching Meta indirectly via module vendors; pair not publicly named
• Alphabet (GOOGL) — MTSI supplies: RF/optical components for GOOGL AI data centers
• Amazon (AMZN) — MTSI supplies: optical/RF chips reaching AMZN AI data centers indirectly via transceiver module makers
• Oracle (ORCL) — MTSI supplies: RF/optical chips reaching ORCL AI data centers indirectly via optical module makers
• CoreWeave (CRWV) — MTSI supplies: component-level optical/RF silicon reaching CRWV only via transceiver and system vendors

Others in Optical Components & Photonics

• Coherent (COHR)
• Lumentum Holdings (LITE)
• Corning (GLW)

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