mstack

FN

2 min read

FN — Fabrinet

TL;DR

Fabrinet is a key contract manufacturer for high-speed optical modules and active electrical cables (AECs) used in AI/ML datacenters. As demand grows for 800G/1.6T interconnects and co-packaged optics (CPO), FN’s precision manufacturing capabilities position it as an agnostic beneficiary across multiple optical component vendors. The company faces risks from potential oversupply in optics but benefits from its role as a manufacturing partner for leaders like Credo and Broadcom.

Business

Fabrinet provides advanced optical packaging and electronics manufacturing services (EMS) for datacom transceivers, silicon photonics modules, and active cables. Key products include 800G/1.6T optical modules, CPO subassemblies, and HiWire AECs. Customers include optical component vendors who outsource manufacturing to FN’s Thailand facilities.

Thesis

  • Leading EMS provider for 800G+ optical modules used in AI clusters 1
  • Manufacturing partner for Credo’s HiWire active electrical cables 1
  • Beneficiary of CPO adoption through silicon photonics packaging 2
  • Agnostically positioned across multiple optics vendors (Lumentum, Coherent, etc.) 1
  • Strong margin profile (30%+ gross margins) in high-mix manufacturing 3

Risks

  • Potential oversupply in optical components could pressure margins 1
  • Customer concentration risk with top 5 customers accounting for ~50% of sales 3
  • CPO adoption could reduce total module count (though FN participates in CPO supply chain) 2

Recent catalysts

  • 2026-02-12 — Tower Semiconductor earnings call mentions FN as packaging partner for Nvidia’s optical modules 3
  • 2026-03-09 — Chipstrat CPO primer highlights FN’s role in optical subassemblies 2

Second-order reads

  • 2026-03-09 — Chipstrat — CPO scaling drives need for advanced packaging → positive for FN’s SiPh capabilities 2
  • 2024-07-03 — Citrini Research — Credo’s AEC growth (75% AI/ML exposure) → positive for FN as manufacturing partner 1

Valuation & positioning

Trading at ~20x forward P/E (inline with optical peers). Market pricing steady growth but may be underestimating CPO-related opportunities.

Sources

CRDO LITE COHR AAOI AVGO MRVL MTSI TSEM

Footnotes

  1. Citrini Research — Interconnects 101 — 2024-07-03 ↩ ↩2 ↩3 ↩4 ↩5

  2. Chipstrat — Optics Primer, Part 3: Co-Packaged Optics (CPO) — 2026-03-09 ↩ ↩2 ↩3 ↩4

  3. Irrational Analysis — Tower+GloFo Earnings, HBM4 Qualification Noise — 2026-02-12 ↩ ↩2 ↩3

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