Group 1 - The metal new materials sector experienced a slight decline of 0.08% on December 29, with Shenzhen Xinxing leading the drop [1] - The Shanghai Composite Index closed at 3965.28, up 0.04%, while the Shenzhen Component Index closed at 13537.1, down 0.49% [1] - Notable gainers in the metal new materials sector included Srey New Materials, which rose by 6.10% to a closing price of 40.19, and Huitong New Materials, which increased by 5.16% to 21.79 [1] Group 2 - The sector saw a net outflow of 563 million yuan from institutional investors, while retail investors contributed a net inflow of 709 million yuan [2] - Major stocks with significant net inflows from retail investors included Galaxy Magnetics, which saw a net inflow of 795.11 million yuan, and Huitong New Materials with a net inflow of 251.34 million yuan [3] - Conversely, stocks like Huada New Materials and Yinstar experienced net outflows from both institutional and retail investors, indicating a shift in investor sentiment [3]