# Photoresist

Part ID: 1.20a · Layer 1 (Compute silicon & packaging) · child of 1.20

Light-sensitive photoresist chemicals used to pattern each layer of a chip during lithography.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| DuPont | manufacturer | inferred | public | DD | / Qnity (QNTY) |
| Fujifilm | manufacturer | inferred | public | 4901.T |  |
| Shin-Etsu | manufacturer | inferred | public | 4063.T |  |
| Tokyo Ohka | manufacturer | inferred | public | 4186.T |  |
| JSR | manufacturer | inferred | private |  | JIC |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.