Shares jumped 21% intraday to 22,800 won after Serenity said the South Korean supplier could benefit from export-control bottlenecks affecting Japan-linked chip materials flows.
Foosung drew renewed market attention after its shares rose 21% intraday to 22,800 won on June 15, as Serenity said the South Korean semiconductor materials supplier could be a major beneficiary of bottlenecks tied to China’s export controls on Japan. The company supplies Samsung Electronics and SK Hynix and accounts for about 10% of global tungsten hexafluoride supply, according to the market commentary. The move adds fresh market reaction to earlier claims that Foosung may be entering a revaluation window as disruptions affect Japan-linked WF₆ supply chains and as South Korea's SK Specialty and Foosung have formally notified customers of planned 2026 tungsten hexafluoride price increases of 70% to 90%.