炼化及贸易板块10月28日跌0.4%，宇新股份领跌，主力资金净流出2.12亿元

Market Overview - The refining and trading sector experienced a decline of 0.4% compared to the previous trading day, with Yuxin Co. leading the drop [1] - The Shanghai Composite Index closed at 3988.22, down 0.22%, while the Shenzhen Component Index closed at 13430.1, down 0.44% [1] Stock Performance - Notable gainers in the refining and trading sector included: - Unified Co. (600506) with a closing price of 24.64, up 10.00% with a trading volume of 366,700 shares and a turnover of 866 million yuan [1] - Heshun Petroleum (603353) closed at 18.84, up 6.92% with a trading volume of 84,300 shares and a turnover of 154 million yuan [1] - Conversely, Yuxin Co. (002986) led the declines with a closing price of 10.61, down 5.77% and a trading volume of 106,300 shares, resulting in a turnover of 114 million yuan [2] Capital Flow - The refining and trading sector saw a net outflow of 212 million yuan from main funds, while speculative funds had a net inflow of 121 million yuan, and retail investors contributed a net inflow of 91.34 million yuan [2] - Key stocks in terms of capital flow included: - Unified Co. (600506) with a main fund net inflow of 84.08 million yuan, but a net outflow from speculative and retail investors [3] - Heshun Petroleum (603353) also experienced a net inflow from main funds but a net outflow from both speculative and retail investors [3]