Group 1 - The best-performing fund managed by manager Ai Xiaojun in the second quarter of 2025 is the Guotai Nasdaq 100 ETF (513100), with a quarterly net value increase of 17.15% [1] - Ai Xiaojun manages a total of 13 funds, with the Guotai Zhongzheng All Index Securities Company ETF (512880) having a scale of 29.795 billion yuan and a quarterly increase of 4.47% [2] - The Guotai Nasdaq 100 ETF has an annualized return of 18.77% and a scale of 15.446 billion yuan, with major holdings including Nvidia, which has a weight of 8.30% [2] Group 2 - During Ai Xiaojun's tenure as the manager of the Guotai Shanghai Stock Exchange 180 Financial ETF, the cumulative return is 176.97% with an average annualized return of 9.25% [2] - The number of adjustments in major holdings during this period is 86, with a profit rate of 60.47% [2] - Notable successful stock adjustments include Guizhou Moutai, which yielded an estimated return of 673.28% over a holding period of over four years [4][6] Group 3 - The Guotai CES Semiconductor Chip ETF (512760) has a scale of 11.474 billion yuan and a quarterly decrease of 0.27% [2] - The Guotai Zhongzheng All Index Communication Equipment ETF (515880) has a scale of 2.7 billion yuan and a quarterly increase of 14.87% [2] - The Guotai Standard & Poor's 500 (QDII-ETF) has an annualized return of 17.27% and a scale of 578 million yuan [2]