Hengtong Optic-Electric Co., Ltd. — AI supply-chain exposure

Hengtong is one of China's largest makers of optical fibre and cable, and through its majority stake in HMN Technologies it also builds the systems that lay bandwidth along the seabed. Its product is the physical medium — the glass and cabling — that carries traffic between cities and, increasingly, between the data-centre regions that cloud operators are separating across oceans.

The structural hook is subsea. As AI workloads push operators to knit distant regions into single training and serving fabrics, the cables crossing oceans become a scarce, hard-to-replace layer, and only a small set of vendors can manufacture and install them. That places Hengtong on a narrow but strategically important link, even though it sits far from the compute itself — which is why the model reads its centrality as modest rather than core.