Fujikura Rides Two Waves as Margin Bets and Analyst Upgrade Align on AI Fiber Play

Fujikura's stock jumps 11% as margin buying surges to 8x shorts, analyst targets ¥6,000, and AI-driven demand for optical fiber fuels massive capacity investments.

The trading screens in Tokyo lit up on May 25, but the activity surrounding Fujikura told a story that went well beyond a single-day rally. As the Nikkei 225 punched through 65,143 points for the first time, driven by Wall Street gains and a drop in oil prices, the optical-fiber and electronic-components specialist surged 11 percent to 5,414 yen. Yet beneath that surface-level pop lay a deeper shift in investor positioning that had been building for days.

Margin buying had already been climbing sharply. In the latest reporting period, leveraged long positions jumped by 1.462 million shares to 18.341 million, while short interest shrank by 268,000 shares to 2.279 million. The resulting margin ratio of 8.05 — meaning long positions outnumber shorts more than eight to one — reflects a conviction that the market is still underestimating Fujikura’s AI infrastructure story. When the stock touched 5,414 yen, trading volume reached 51.8 million shares worth roughly 274.9 billion yen by mid-morning, with buyers consistently paying above the volume-weighted average price of 5,302 yen — a hallmark of genuine accumulation, not a dead-cat bounce.

That same conviction was echoed by Iwai Cosmo, which on May 22 reaffirmed its top “A” rating and lifted its price target from 4,167 yen to 6,000 yen — a 44 percent increase. The upgrade landed when Fujikura was trading at 4,850 yen, meaning the new target implies roughly 24 percent upside from that level. Both the margin data and the analyst call point to a market that is repricing the company not on past performance, but on the scale of its investment pipeline.

And that pipeline is enormous. Fujikura plans to spend up to 300 billion yen on new capacity in Japan and the United States. The centerpiece is a new plant at its Sakura Works complex, costing up to 40 billion yen, designed to meet surging demand for optical-fiber cables used in generative AI data centers. The company has already taken steps in the U.S. by incorporating a preparatory subsidiary, Fujikura Optical Cable Systems LLC, in Delaware. Those investments, however, are unlikely to have a material impact on the current fiscal year’s results — a fact that helps explain the tension between today’s momentum and tomorrow’s uncertainty.

The underlying fundamentals certainly justify some of the enthusiasm. In the fiscal year ended March 2026, Fujikura’s net sales rose 21 percent to 1.182 trillion yen, operating profit jumped 39 percent to 188.7 billion yen, and net profit surged 72.5 percent to 157.2 billion yen. The information and communications technology segment alone delivered 653 billion yen in revenue and 152.7 billion yen in segment profit — the lion’s share of group earnings. Looking ahead to fiscal 2026 (through March 2027), management forecasts more moderate growth: sales of 1.243 trillion yen, operating profit of 211 billion yen, and net profit of 156 billion yen, slightly below the prior year. That deceleration — explosive growth behind, a softer path ahead — is the source of the jitteriness that has kept the stock volatile.

Indeed, even after the May 25 surge, the shares were still down roughly four percent from the previous week and more than ten percent from a month earlier. The 52-week range of 963 yen to 7,933 yen says everything about the violent swings in the AI data-center trade. At a forward P/E of 57.5 and a price-to-book ratio of 16, Fujikura does not come cheap. Investors are pricing in a bet that the 300 billion yen capex program will translate into order book growth soon enough. The next quarterly numbers will be the first real test of whether that bet is paying off — or whether the margin buyers and the analysts are getting ahead of the curve.