Layer 4 · 007660 — ISU Petasys
Thesis
Korean AI server HDI PCB pure-play — direct beneficiary of the AI server / supercomputer backplane mix shift. 2025 revenue +30% YoY, trailing 12-month gain +360% as the structural tightness in AI HDI PCB capacity gets priced. Tier B because the price source disagreement (TradingView KRW 106,400 vs Investing.com KRW 141,400) prevents Tier A confidence until reconciled with a clean local source.
What it does + financial print
ISU Petasys makes high-density interconnect (HDI) PCBs for AI servers, networking switches, and supercomputer backplanes. The AI server build-out is structurally tightening HDI capacity because the layer count and board complexity of GB200 NVL72 and equivalent racks is materially higher than prior-generation enterprise servers — a single Blackwell tray uses several times the PCB content of a Hopper tray.
Q1 2026 (May 8) printed revenue beat (2025 full-year +30% YoY to KRW 1.09T). EPS beat. Guidance constructive on AI server HDI PCB demand. Stock at KRW 106,400 on May 16 per primary source; needsmanualcheck for the variance vs Investing.com.
Bull case
AI server HDI demand continues to outrun supply through 2027 as hyperscalers can't get enough backplane capacity. ISU captures a tier-1 hyperscaler design win for a next-gen networking switch. Q2 print confirms the +30% YoY revenue trajectory. Price-source reconciliation pushes the stock to the higher of the two prints.
Gap / bear case
+360% TTM is a parabolic move that invites profit-taking on any disappointment. Small-cap Korean OSAT exposure means liquidity is thin and FX-translated returns can lag the local print. The price source variance suggests one of the venues has stale data — needs to be sorted out before sizing.
Trigger to upgrade / downgrade
Upgrade to Tier A on (a) price source reconciliation showing clean data above KRW 100,000, AND (b) a named hyperscaler / Korean defense backplane win. Downgrade on revenue deceleration below +20% YoY.
The trade
- Entry zone: KRW 92,000-100,000 on pullback (subject to price-source reconcile)
- Stop: KRW 84,000 close
- Position size: 1% NLV (already owned 5K sh; treat as add-on)
- Catalyst date: Q2 print August 10 2026
- Conviction: 7/10