Layer 6 · 6857 — Advantest Corporation
Thesis
Advantest is the HBM tester monopoly — when an HBM stack comes off a SK Hynix or Samsung packaging line, it gets tested on an Advantest V93000. FY26 guide came in +26% revenue with the SoC tester segment +32%. Tier B is purely tactical: the stock dropped -7.88% on a conservative flat-margin guide despite the revenue print. Fundamentals are Tier A and would re-promote on stabilisation.
What it does + financial print
Layer 6 ATE — semiconductor automated test equipment. The HBM testing flow is genuinely sole-sourced to Advantest in practice (Teradyne plays in SoC and is the second source on memory but lags on HBM). HBM4 brings 16-Hi stacks with new known-good-die testing requirements; Advantest's roadmap is the only one with confirmed coverage.
Q4 FY26: EPS JPY 174.55 versus JPY 138.67 consensus — a clean beat. Revenue JPY 328.07B versus JPY 281.48B consensus. FY26 guide (the year ending March 2027): revenue +26%, SoC tester market +32% on the year. But the operating-margin guide came in flat to slightly down despite the revenue acceleration, and the stock printed -7.88% on the result. Price JPY 26,360. Next earnings July 29.
Bull case
What promotes back to Tier A is a clean stabilisation of the price around JPY 25-27K plus a Q1 FY27 print confirming the +26% revenue trajectory is on. The HBM testing thesis is single-best inside the AI test stack.
Gap / bear case
The conservative flat-margin guide is the gap. Customer concentration on the TSMC/NVIDIA/HBM trio creates beta to any single-name AI capex revision. The -7.88% drop signals positioning fragility.
Trigger to upgrade / downgrade
Upgrade trigger: hold of JPY 25,500 zone plus July 29 Q1 print confirming margin trajectory. Downgrade trigger: loss of JPY 24,000 (technical breakdown level).
The trade
- Entry zone: JPY 25,500-26,500 - Stop: JPY 24,000 (technical; below post-print swing) - Position size: 2% of NLV - Catalyst date: Q1 FY27 print July 29 - Conviction: 8/10