# Korean Semiconductor Supply Chain Entities

Every entry below is a lead to investigate, not a fact to cite. Your job is to verify,
contradict, or discover what's missing. Look for companies and relationships that aren't
listed here.

## Precursor Chemicals (ALD/CVD)
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| DNF Co. | 디엔에프 | 092070.KQ | Hf/Zr ALD/CVD precursors | HIGH |
| UP Chemical | 유피케미칼 | NOT LISTED (acquired by China's Yoke Technology/雅克科技 002409.SZ in 2016, 96.28% stake) | Metal-organic ALD/CVD precursors | HIGH |
| SK Trichem | SK트리켐 | — | Hafnium ALD precursors (SK Group) | HIGH (user-provided Investmap data) |
| LK Chem | 엘케이켐 | 489500.KQ | Precursor ligands (tier-2) | MEDIUM (user-provided Investmap data) |
| Hansol Chemical | 한솔케미칼 | 014680.KS | H2O2, precursors | HIGH |

## Specialty Gases
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| SK Specialty | SK스페셜티 | Part of SK Inc. (034730.KS) | NF3 (suspected major global position, verify), WF6, SiH4 | HIGH |
| Foosung | 후성 | 093370.KS | NF3, WF6, BF3, fluorine gases | HIGH |
| Hyosung Chemical | 효성화학 | 298000.KS | NF3, specialty gases | HIGH |
| ENF Technology | 이엔에프테크놀로지 | 102710.KQ | Ultra-pure gases, HF | HIGH |

## Wet Chemicals
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| Soulbrain | 솔브레인 | 036830.KQ / 357780.KQ | Ultra-pure HF, etchants, phosphoric acid | HIGH |
| Dongjin Semichem | 동진쎄미켐 | 005290.KS | Photoresists, developers, etchants | HIGH |
| Dongwoo Fine-Chem | 동우화인켐 | 088910.KQ | IT chemicals, semiconductors, display materials (Sumitomo Chemical affiliated) | HIGH |
| KC Tech | 케이씨텍 | 281820.KQ | CMP slurry and pads | HIGH |

## Photoresists & Lithography
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| Dongjin Semichem | 동진쎄미켐 | 005290.KS | KrF/ArF resists, SOH, BARC | HIGH |
| S&S Tech | 에스앤에스텍 | 101490.KQ | EUV pellicles, photomask blanks | HIGH |

## Silicon Wafers
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| SK Siltron | SK실트론 | SK Inc. subsidiary | 200mm/300mm wafers, SiC | HIGH |

## Equipment (Selected)
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| WONIK IPS | 원익IPS | 240810.KQ | CVD, ALD, diffusion furnaces | HIGH |
| HPSP | 에이치피에스피 | 403870.KQ | High-pressure annealing (near-monopoly) | HIGH |
| Hanmi Semiconductor | 한미반도체 | 042700.KS | TC bonding, packaging equipment (HBM) | HIGH |
| PSK Inc. | 피에스케이 | 319660.KQ | Ashing/strip equipment | HIGH |
| Jusung Engineering | 주성엔지니어링 | 036930.KQ | PECVD, ALD equipment | HIGH |
| SEMES | 세메스 | NOT LISTED (Samsung sub) | Etch, CVD, coater/developer, clean | HIGH |
| Park Systems | 파크시스템즈 | 140860.KQ | AFM metrology | HIGH |
| Nextin | 넥스틴 | 348210.KQ | Wafer defect inspection | HIGH |

## Ceramic/Quartz Parts
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| WONIK QnC | 원익큐엔씨 | 074600.KQ | Quartz ware, SiC, ceramic | HIGH |
| Hana Materials | 하나머티리얼즈 | 166090.KQ | SiC rings, quartz parts | HIGH |
| MiCo | 미코 | 059090.KQ | Ceramic heaters, ESCs | HIGH |

## Packaging Materials
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| Samsung Electro-Mechanics | 삼성전기 | 009150.KS | FC-BGA substrates, MLCC | HIGH |
| Simmtech | 심텍 | 222800.KQ | FC-BGA substrates | HIGH |
| Duksan Hi-Metal | 덕산하이메탈 | 077360.KQ | Solder balls | HIGH |
| Haesung DS | 해성디에스 | 195870.KQ | Lead frames, substrates | HIGH |

## Test & Inspection
| Company | Korean | Ticker | Products | Confidence |
|---|---|---|---|---|
| Leeno Industrial | 리노공업 | 058470.KQ | Test probes, pogo pins | HIGH |
| ISC Co. | 아이에스시 | 095340.KQ | Rubber test sockets | HIGH |
| Koh Young | 코영테크놀로지 | 098460.KQ | 3D SPI, AOI | HIGH |

## Key Intelligence Notes
- **SEMES** (세메스) is Samsung's captive equipment arm — NOT publicly traded, ~KRW 2T+ revenue. Invisible outside Korea.
- **SK Group** is building a parallel captive supply chain: SK Specialty (gases), SK Siltron (wafers), SK Enpulse/SKC Solmics (CMP pads), SK Trichem (precursors).
- **KOSDAQ** is where most supply chain companies trade. KOSPI for larger diversified ones.
- **HBM demand** is reshaping the supply chain — benefiting HPSP, Hanmi Semi, Leeno, Haesung DS.

## Verification Log

Entries start as unverified hypotheses from training knowledge. When an investigation confirms or updates a claim, log it here. Unlogged entries remain unverified.

| Company | Claim Verified | Date | Sources | Investigation |
|---|---|---|---|---|
| Soulbrain | Samsung Pyeongtaek primary HF supplier (post-2019) | 2026-03-13 | 피치원미디어, 녹색경제신문, BusinessKorea, ZDNet Korea | HF supplier ID |
| Soulbrain | 12N purity achieved, ~85% domestic HF market, ~2/3 of Korean fab HF | 2026-03-13 | BusinessKorea, ZDNet Korea | HF supplier ID |
| ENF Technology | Samsung secondary HF supplier; imports/refines from Stella Chemifa & Morita | 2026-03-13 | 디지털데일리, ET News English, The Worldfolio | HF supplier ID |
| Wonick Materials | Samsung gaseous HF (etching gas) supplier; Samsung >80% of revenue | 2026-03-13 | 아주경제, FOMEK | HF supplier ID |
| Foosung | Samsung/SK Hynix gaseous HF supplier | 2026-03-13 | Korean press (multiple) | HF supplier ID |