Layer 4 · 009150 — Samsung Electro-Mechanics
Thesis
Three-leg AI thesis — ABF substrate share gains as Ibiden / Unimicron run at capacity, MLCC content per AI server rising, and camera-module / semi packaging diversification. Tier B because v3 had this at WATCH 7/10 and the price action validates the watch but hasn't yet earned the upgrade — needs a single quarter where ABF revenue is explicitly disclosed at materially higher mix.
What it does + financial print
Samsung Electro-Mechanics (SEMCO) is a Samsung-affiliated component supplier — three segments: MLCC (multi-layer ceramic capacitors, ~30-40% of mix), camera modules (for Galaxy phones), and semiconductor packaging (ABF substrates, FCBGA). The AI angle runs through ABF substrate share-gain (the duopoly with Ibiden / Unimicron is so tight that any qualified third supplier wins business) and MLCC content increasing per AI server.
Q1 2026 (April 29) printed in-line revenue, in-line EPS. Guidance constructive on ABF/MLCC AI server mix rising. Stock at KRW 1,024,000 on May 14, near ATH.
Bull case
ABF substrate volumes ramp at scale — every Blackwell/Rubin GPU package needs a substrate, and SEMCO is the third source. A clean quarter where SEMCO discloses ABF revenue at >10% of total mix, or names a hyperscaler design partner, would unlock Tier A. MLCC pricing tightening with AI server build adds the second leg.
Gap / bear case
Samsung captive customer dependency — the smartphone OEM business and Galaxy camera-module mix is mature and not growing. MLCC pricing is cyclical and the up-cycle is in its later innings. The ABF story is real but not yet quantified in the financial disclosures.
Trigger to upgrade / downgrade
Upgrade to Tier A on an explicit ABF substrate revenue disclosure with named hyperscaler / AI customer. Downgrade on smartphone-mix collapse hitting >20% of revenue.
The trade
- Entry zone: KRW 920,000-980,000 on pullback
- Stop: KRW 870,000 close (200-day)
- Position size: 1% NLV
- Catalyst date: Q2 print July 29 2026
- Conviction: 6/10