Fujikura shares plunge 17% on disappointing AI demand outlook

Shares of Japan's Fujikura Ltd. lost 17% of their value after the company published a three-year forecast that came in below market expectations for AI-driven demand for high-density optical fiber used in global communication networks.

What happened

Fujikura, one of the world's leading makers of optical fibers and cables, published its three-year outlook. Investors had expected an optimistic statement about growth in demand tied to AI data centers. Instead, the company gave figures that sounded more modest.

This was not a negative forecast: Fujikura still expects growth. But the pace and volumes were lower than what the market had priced into the shares. Investors promptly repriced the stock downward. During the session, the shares fell by more than 17%.

Why investors believed in AI demand

The logic seemed clear and unassailable: AI chips require huge data centers. Data centers have to be connected to each other and to customers through a global network. That requires optical fibers, the cables that carry signals at the speed of light. Fujikura is one of the largest suppliers of these cables. So when AI takes off, its revenue takes off too.

That rule worked for chips (Nvidia, TSMC) and, in part, for cooling. Investors decided to apply it to network infrastructure as well, and Fujikura's shares rose on the wave of AI hype.

But the optical fiber market works differently. It is not microelectronics, where one player dominates. It is a fairly competitive segment with several large manufacturers. Demand is growing, but more steadily. It cannot be tripled in a year just because a new hype cycle has appeared.

Why demand disappointed

Several factors left real demand below expectations:

• The pace of cloud data center expansion has slowed, as providers have become more cautious
• The volume of new optical fiber orders for 2024-2026 turned out smaller than forecast
• Competition keeps prices under pressure and squeezes manufacturers' margins
• Existing network capacity has not yet been fully exhausted

What this means

The Fujikura story shows something important: AI hype overvalues not only the chips themselves but the entire infrastructure chain. Investors are betting that the world will rebuild itself around AI within a year, but reality is slower. Every component, from silicon to cables, needs a sober assessment.

Fujikura is falling not because it forgot how to make fiber, but because its income will grow more slowly than enthusiastic investors priced in.