Castech shares fluctuate as controlling shareholder reduces stake

Castech announced abnormal stock fluctuations, with its share price having cumulatively deviated by over 20% across three consecutive trading days (December 8-10, 2025). The company confirmed no undisclosed major information, significant changes in operations or external environment, or pending material matters exist.

Concurrently, China's Fujian Institute of Research on the Structure of Matter (FIRM), Castech's controlling shareholder, decreased its holdings by 1.0429 million shares through concentrated competitive bidding during the period of abnormal stock fluctuation. This is part of a previously disclosed plan to reduce holdings by up to 9.405 million shares (2.00% of total capital). FIRM's stake has fallen from 25.53% to 20.00%, crossing the 5% integer threshold for equity changes.

FIRM has now completed the sale of 2.75 million shares at an average price of 54.87 yuan per share, reducing its total holdings to 94.05 million shares, or 20.00% of Castech's capital. The company reminds investors to exercise caution and base decisions on information published on designated media outlets.