On Monday June 15, China's Shanghai Composite Index opened higher by 22.07 points (+0.55%) at 4,053.58; Shenzhen Composite Index opened higher by 189.78 points (+1.27%) at 15,153.18; CSI 300 Index opened higher by 51.97 points (+1.09%) at 4,829.29; ChiNext Index opened higher by 65.81 points (+1.72%) at 3,896.17; STAR 50 Index opened higher by 24.45 points (+1.47%) at 1,687.67.

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Tungsten hexafluoride (WF6), a key deposition gas for memory and advanced logic chips, has seen sharp price gains as some overseas capacity exited and downstream memory-chip expansion widened the supply gap. An analyst expects 5N-grade WF6 to average roughly 1,760 yuan/kg in June, up about 236% YoY, and cites sustained memory demand as the core support. A Shanghai specialty-gas producer reported a surge in helium demand; factories are running two shifts yet remain undersupplied, and buyers report prices moving daily with risk of immediate unavailability.