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DEEP RESEARCH · PSK HOLDINGS

PSK Holdings: Bottleneck Tools for HBM and CoWoS

GENEVA reflow and ECOLITE descum give the company exposure to two AI-hardware packaging bottlenecks.

Date: 2025-11-15 · Semiconductor back-end equipment analysis · Naver Blog

Investment decisions are your responsibility. This material is research, not a recommendation to buy or sell.

0. Bottom line first

Q3 2025 revenue of KRW 90.6bn, operating profit of KRW 41.2bn, and OPM of 45.5% show that GENEVA reflow for HBM MR-MUF and ECOLITE descum for CoWoS have become simultaneous growth engines.

AI packaging bottleneckHBM and CoWoS expansion
HBMGENEVA Fluxless Reflow
MR-MUFSK hynix process moat
CoWoSECOLITE Descum
OSATBreak in ULVAC dominance
Reflow is technology-led; descum grows through price competitiveness and OSAT spillover.

1. Earnings and outlook

ItemFigure
Q3 2025 revenueKRW 90.6bn, YoY +132%, QoQ +161%
Q3 2025 OPKRW 41.2bn, YoY +189%, QoQ +388%
OPM45.5%, 44% above consensus OP of KRW 28.5bn
2023ARevenue KRW 95.0bn, OP KRW 27.0bn, OPM 28.5%
2024ARevenue KRW 216.0bn, OP KRW 88.0bn, OPM 41.1%
2025FRevenue KRW 206.0bn, OP KRW 72.0bn, OPM 34.8%
2026FRevenue KRW 227.0bn, OP KRW 69.0bn, OPM 30.2%

2. Reflow and descum

GENEVA is a fluxless bump reflow tool that removes flux coating and cleaning steps. In HBM MR-MUF, it provides uniform heat across the stacked dies and bonds many bumps at once in the mass reflow step. Micron HBM mass-production tool supply in March 2024 means PSK has supplied all three major HBM makers: Samsung Electronics, SK hynix, and Micron.

ECOLITE descum removes plasma scum that interferes with RDL patterns or bump formation. TSMC CoWoS bottlenecks led to OSAT outsourcing, opening a price-sensitive equipment market where PSK challenged Japans ULVAC monopoly.

3. CoWoS and R&D

CoWoS outlook202520262027
Industry monthly estimate40k/month90k/month-
Goldman Sachs675k/year1.20m/year1.74m/year
Citi650k/year800k/year1.10m/year

Hybrid bonding is the long-term threat, but SK hynixs plan to use Advanced MR-MUF through 16-layer HBM4 gives GENEVA another 2-3 years. The Pangyo R&D center, totaling KRW 82.5bn with PSK Holdings share at KRW 41.25bn, is the pivot base for annealing tools needed after hybrid bonding.

4. Risks

  • Early hybrid-bonding transition could pressure reflow revenue.
  • High-margin mass reflow remains dependent on SK hynixs roadmap.
  • ULVAC and STI responses can pressure pricing and margins.

Sources

Naver original