水泥板块12月29日跌0.49%，海南瑞泽领跌，主力资金净流出2256.86万元

Group 1 - The cement sector experienced a decline of 0.49% on December 29, with Hainan Ruize 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 cement sector included Sifang New Material, which rose by 6.56% to a closing price of 14.78, and Guotong Co., which increased by 4.09% to 14.49 [1] Group 2 - The cement sector saw a net outflow of 22.5686 million yuan from institutional funds, while retail investors contributed a net inflow of 16.5 million yuan [2] - Major stocks in the cement sector showed varied performance, with significant declines in stocks like Baking House, which fell by 5.39% to 5.62, and Sichuan Jinding, down 3.11% to 12.79 [2] - The trading volume for the cement sector was substantial, with Sifang New Material recording a volume of 234,600 shares and a transaction value of 347 million yuan [1] Group 3 - The main net inflow for institutional funds was observed in Conch Cement, with a net inflow of 1.65 billion yuan, while retail investors showed a net outflow of 99.9765 million yuan [3] - Other notable stocks included Jinyu Group with a net inflow of 32.5081 million yuan from institutional funds, and Sanhe Pile with a net inflow of 19.7582 million yuan [3] - The overall sentiment in the cement sector appears mixed, with institutional investors pulling back while retail investors are more active [2][3]