Fujikura’s ¥5.6 Trillion Reality Check: A Forecast Miss Rewrites the AI Fiber Narrative

Fujikura’s 40% weekly plunge after a 140 billion yen profit forecast gap highlights the fragility of even the hottest AI infrastructure plays, despite a massive capex plan.

The sheer velocity of Fujikura’s rally had become a story in itself — a 400% surge in 2024 followed by another 160% by the end of 2025, fuelled by insatiable demand for fibre-optic cables powering AI data centres. But the script flipped violently between May 19 and May 25, when the stock crashed roughly 40% in a single week. The trigger was a single number that didn’t match the market’s expectations: management’s forecast of 315 billion yen in operating profit for fiscal 2028, compared with the consensus of 455 billion yen. That 140 billion yen gap — roughly 30% below what analysts had baked in — wiped out around 5.6 trillion yen in market capitalisation and sent a stark signal that even the hottest AI infrastructure plays are not immune to a credibility check.

The aftershocks are still being felt. On a recent Friday, with the Nikkei 225 punching to a fresh all-time high and gaining 2.53%, Fujikura slid 4.90% to land among the index’s three biggest decliners alongside Mitsubishi Motors (down 8.54%) and Fujitsu (off 4.13%). The stock closed at roughly 4,701 yen, slipping from the previous day’s 4,939 yen, while peer supply-chain names such as SUMCO and Ibiden surged 19.30% and 16.51% respectively. The contrast highlights a growing divide: the AI trade is still lifting many boats, but Fujikura’s vessel is taking on water after the profit projection debacle.

Valuation remains a sticking point. Even after the 40% haircut, the stock trades at a price-to-earnings ratio of around 58.5, compared with a sector average of 14 for Japanese electrical-equipment makers. Some analysts argue a fairer multiple would be roughly 49 based on current earnings power, but the market is still pricing in a hefty growth premium — perhaps too hefty. The average price target among analysts stands at 5,808.90 yen, implying 23.6% upside from recent levels, with a wide range from 3,500 to 8,100 yen. The consensus rating is “Strong Buy,” yet the gap between bullish analyst expectations and the market’s sudden skittishness has rarely been wider.

None of this has deterred Fujikura from pressing ahead with one of the most ambitious capital-expenditure plans in its history. The company is committing up to 300 billion yen to roughly triple its fibre-optic cable production capacity. The lion’s share — 260 billion yen — will go into expanding facilities in the United States to serve North American data-centre demand, while 40 billion yen is earmarked for its Sakura plant in Chiba Prefecture, Japan. The strategic focus, which management calls “offensive selectivity”, centres on high-density fibre products such as Spider Web Ribbon and Wrapping Tube Cable — components increasingly sought after in hyperscale AI server farms.

Alongside the capex push, Fujikura is revamping its corporate governance. The external auditor is being switched, and executive compensation is being overhauled with a new restricted-stock programme designed to tie leadership incentives more closely to long-term shareholder returns. These moves signal that the board recognises the need for tighter alignment, even as it maintains its investment trajectory.

The disconnect between the company’s long-term ambitions and the market’s short-term verdict is now the central question for investors. Friday’s drop — on a day when the broader Tokyo market was euphoric — suggests that some participants are still recalibrating their risk models after the 40% shock. The Nikkei’s volatility index tumbled 13.46% to a one-month low of 26.95, and a weakening yen pushed the dollar to 159.22 yen, yet none of that could lift Fujikura. The next quarterly earnings report will be the first real test of whether the ¥300 billion bet can restore the narrative — or if the forecast miss has permanently cracked the AI gloss.