国有大型银行板块12月30日跌0.31%，交通银行领跌，主力资金净流出1.43亿元

Group 1 - The core viewpoint of the news is that the state-owned large bank sector experienced a slight decline of 0.31% on December 30, with the Bank of Communications leading the drop [1] - The Shanghai Composite Index closed at 3965.12, showing no change, while the Shenzhen Component Index rose by 0.49% to 13604.07 [1] - The trading performance of individual state-owned banks varied, with Postal Savings Bank gaining 0.37% and Bank of Communications falling by 1.76% [1] Group 2 - The net outflow of main funds from the state-owned large bank sector was 143 million yuan, while retail investors saw a net inflow of 180 million yuan [1] - The detailed fund flow for individual banks showed that Agricultural Bank and Bank of Communications had significant net outflows from main funds, while retail investors contributed positively to their inflows [2] - The data indicates that the main funds were predominantly negative for most banks, with the exception of Industrial and Commercial Bank, which had a net inflow of approximately 533 million yuan from speculative funds [2]