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COMPANY RESEARCH / 2802.T

Ajinomoto

Ajinomoto Build-up Film (ABF) substrate insulation

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Where it fits in an AI server rack

Makes Ajinomoto Build-up Film (ABF), the interlayer insulation used to build semiconductor package substrates. Its ASV Report 2026 says the business targets growing demand in AI, data centers and networks as package substrates grow larger with more layers, raising ABF use. ASE’s 2025 Form 20-F flags possible ABF substrate shortages from strong AI demand.

What the evidence establishes

Upstream enabler

Disclosed: upstream enabler; Ajinomoto’s ASV Report 2026 describes ABF as a material for package substrates, with demand driven by AI, data centers and networks.

Materials, substrates, equipment or foundry capacity behind rack components. This is not a component supplier role or an established AI-rack revenue stream.

Component roleAjinomoto Build-up Film (ABF) substrate insulation
EvidenceDisclosed: upstream enabler; Ajinomoto’s ASV Report 2026 describes ABF as a material for package substrates, with demand driven by AI, data centers and networks.
How we knowDisclosed The company’s own filing, release, annual report, product page or investor record describes the AI-server or AI-rack role. Where customers are unnamed, the listing says so.
Primary sourceAjinomoto — supporting disclosure
Company or official disclosure; vendor claims are attributed to their source.
Checked. This is the research review date, not the source publication or quote time.

Keep in perspective

A material supplier, not a substrate or component maker; its film customers are substrate makers and are not named. Electronic materials are a small part of a food and amino-acid group.

Diversified business exposure. This describes the breadth or role of the business; it is not an investment rating. An AI-server product, design-in or partnership does not by itself establish material AI-rack revenue, market share, or future returns.

Connections to the assembly

These links explain the technology relationship. The model is illustrative and does not represent an actual manufacturer’s bill of materials.

ABF package substrate

A large multilayer organic substrate made with build-up film. It fans the interposer’s dense connections out to the pitch of the board and carries power to the dies.

Scope of the company links: ABF (FCBGA) package substrates. Ibiden (strong GPU demand, substrates for AI servers and switching ICs) and Samsung Electro-Mechanics (FCBGAs for AI accelerators and server CPUs) disclose AI-accelerator substrate supply without naming customers. Unimicron markets FCBGA for AI servers and switches, and Nan Ya PCB is developing large, high-layer substrates for AI and HPC (positioning). Kinsus is named by ASE as an IC substrate supplier, with no AI program documented. Ajinomoto supplies the ABF insulating film to substrate makers and is an upstream enabler, not a substrate maker. Which substrate maker supplies a given GPU is reported, not disclosed.

Related research

Companies with overlapping sector exposure. Their products and evidence may differ; this is not a list of equivalent investments.

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