57亿，净流入

Group 1 - The stock ETF market experienced a net inflow of approximately 5.7 billion yuan on August 22, with the total market size stabilizing above 4 trillion yuan [2][5] - The trading volume of stock ETFs reached 270.81 billion yuan, marking an increase of nearly 61.8 billion yuan, or about 30%, compared to the previous day [3][5] - The leading ETFs in terms of inflow included the CSI 500 ETF with a net inflow of 5.012 billion yuan and the CSI 300 ETF with 2.729 billion yuan [6][7] Group 2 - The technology-focused ETFs, particularly those related to the STAR Market and semiconductor sectors, saw significant gains, with the STAR 50 ETF rising by 15.94% [3][4] - The overall performance of the STAR 50 ETF was notable, despite experiencing a net outflow of 7.189 billion yuan on the same day [9][10] - The trend of "selling into strength" was observed, indicating a strategy of taking profits as prices rise [11]