Japanese Tech Stocks Rally on Data Center and AI Demand Surge

Japanese technology stocks surged on June 19, 2026, driven by strong demand for data center equipment and AI-related semiconductors. Fujikura <5803> posted the day's largest gain, rising 15.7% to hit the daily limit after the company significantly revised upward its fiscal 2027 earnings forecasts. The company cited unexpected high-volume orders from hyperscalers for optical components and relief from hydrogen supply constraints as key drivers. The company raised its revenue forecast by 23.7% to 1.462 trillion yen, operating profit by 64.3% to 310 billion yen, and net profit by 45.7% to 229 billion yen.

Other major gainers reflected the broader strength in data center-related technologies. Kioxia <285A> climbed 12.1%, continuing a seven-day winning streak and updating its all-time high as global semiconductor memory stocks benefited from strength in the U.S. market and increased AI semiconductor investment demand. Sans Co. <5985> surged 22.1%, fueled by reports of expanded production capacity in China for optical connectors used in data center applications. Shin Denko <6844> rose 15.0% as investors recognized its exposure to data center infrastructure equipment, including lithium-ion battery systems and power semiconductors for reducing data center power consumption.

The momentum across these stocks reflected broader market dynamics. Following a U.S.-Iran combat cessation agreement, global equity markets shifted toward risk-on sentiment, with significant capital flowing into AI semiconductor-related equities. Anritsu <6754> also gained 7.7% after SMBC Nikko Securities raised its target price on expectations that AI data center optical transceiver demand would exceed previous estimates. The synchronized strength across optical components, semiconductors, and related infrastructure suppliers underscored investor conviction about sustained data center and AI expansion.