Kanto Chemical Co., Inc. — AI supply-chain exposure

Kanto Chemical is a private Japanese maker of the ultra-high-purity wet chemicals — sulfuric acid, ammonia solutions, photoresist developers — that fabs use to clean and etch wafers between the many process steps behind a finished chip. These liquids are unglamorous but unforgiving: trace contamination scraps wafers, so leading fabs qualify a narrow set of suppliers and rarely switch. That quiet lock-in is the hook. As a consumable bought continuously across every advanced line, Kanto sits in the materials layer that underpins memory and logic alike, even though the model scores its chain centrality lightly.