YOFC (06869) saw its shares rise more than 11% in morning trading. As of the latest update, the stock was up 11.34% to HK$233.6, with a turnover of HK$29.81 billion. The surge is driven by a significant increase in demand for optical fiber due to the expansion of AI training and inference clusters, leading to a supply shortage. According to estimates from Rebio Group, North American demand for optical fiber is projected to grow 22% to 25% this year, while supply is expected to increase only 12% to 19%. A report from Data Center Dynamics indicates that delivery lead times for bulk buyers have extended to 20 weeks, with smaller buyers facing wait times of up to a year. Notably, MSCI recently announced the formal inclusion of YOFC's A-shares in the MSCI Emerging Markets Index, with the adjustment taking effect after the market close on May 29. Northeast Securities released a research note stating that in the first quarter of 2026, YOFC's performance showed further strong growth, with quarterly net profit attributable to shareholders and gross profit margin both reaching record highs. The gross profit margin for the period was approximately 41.5%, a year-on-year increase of about 13.7 percentage points, which is also a core reason for the release of performance elasticity in this cycle.