Mei Ri Shang Bao·2025-05-21 22:13Market Overview - A-shares showed a significant change in style, with large-cap stocks strengthening while small-cap stocks mostly declined. The Shanghai Composite Index rose by 0.21%, the Shenzhen Component Index increased by 0.44%, and the ChiNext Index gained 0.83%. The total trading volume in the Shanghai and Shenzhen markets reached 1.17 trillion yuan, an increase of 37.8 billion yuan compared to the previous trading day [1] Resource Sector Performance - The gold and coal sectors continued to perform strongly. International gold prices surged, with spot gold breaking through the $3,300 per ounce mark for the first time since May 9, driven by rising geopolitical risks and a weakening US dollar. The gold concept sector in A-shares rose by 2.06%, ranking third among industry sectors for the day, with a weekly increase of 4.38% [2][3] - The coal mining and processing sector also saw significant gains, with the sector rising by 2.14%. Major stocks like Dayou Energy and Shanxi Coal International experienced notable increases [4] Solid-State Battery Sector - The solid-state battery concept sector exhibited strong performance, with stocks like Ningxin New Materials and Lingpai Technology hitting their daily limit up. The sector rose by 1.86% overall, ranking fifth among industry sectors. The Shenzhen International Battery Technology Exchange held on May 15-17, 2025, showcased various solid-state battery products, indicating a growing interest and investment in this technology [5][6]