Group 1 - The PVDF concept sector experienced a decline of 1.65%, ranking among the top declines in concept sectors, with major declines seen in companies like Sanmei Co., Ltd., Juhua Co., Ltd., and Shenzhen New Star [1][2] - Among the PVDF concept stocks, only two stocks saw price increases, with Jinming Precision Machinery rising by 1.46% and ST Lianchuang by 0.59% [1][2] - The main capital outflow from the PVDF concept sector today was 297 million yuan, with 12 stocks experiencing net outflows, and six stocks seeing outflows exceeding 10 million yuan [2][3] Group 2 - Juhua Co., Ltd. had the highest net capital outflow of 123.45 million yuan, followed by Dongyangguang with 99.37 million yuan and Putailai with 22.80 million yuan [2][3] - The stocks with the highest net capital inflow included Haohua Technology, Jinming Precision Machinery, and Sanmei Co., Ltd., with inflows of 23.99 million yuan, 5.89 million yuan, and 3.76 million yuan respectively [2][3] - The trading volume for Juhua Co., Ltd. was 2.10%, while the trading volume for Jinming Precision Machinery was 4.04% [3]

Market Performance - As of June 26, the DRG/DIP concept index rose by 1.97%, ranking fifth among concept sectors, with 16 stocks increasing in value [1] - Notable gainers included Kechuang Information, which hit a 20% limit up, and Huayu Software, Guoxin Health, and Digital Certification, which rose by 4.75%, 3.69%, and 3.50% respectively [1] - The sectors with the highest and lowest daily performance included the Military Equipment Restructuring concept at +8.73% and the Photolithography Machine concept at -1.48% [1] Capital Flow - The DRG/DIP concept sector saw a net inflow of 412 million yuan, with 14 stocks receiving net inflows, and 5 stocks attracting over 30 million yuan each [1] - Kechuang Information led the net inflow with 205 million yuan, followed by Guoxin Health, Huayu Software, and Digital Certification with net inflows of 69.67 million yuan, 64.82 million yuan, and 47.87 million yuan respectively [1] - The top three stocks by net inflow ratio were Kechuang Information at 20.10%, Guoxin Health at 13.05%, and Huayu Software at 11.15% [2]

- Model name: Broad-based index rotation strategy; Model construction idea: Using the weekly change rate of the total heat of different broad-based indices to construct a rotation strategy; Model construction process: Calculate the weekly heat change rate of different groups of stocks and smooth it using MA2. On the last trading day of each week, buy the broad-based index with the highest total heat change rate MA2. If the highest change rate is in the "other" group, stay in cash. The strategy's net value is shown in the report. The formula is: $ \text{Heat Change Rate MA2} = \frac{\sum_{i=1}^{n} \text{Heat Change Rate}_i}{n} $ where $ n $ is the number of weeks. The strategy's annualized return since 2017 is 8.74%, with a maximum drawdown of 23.5%. The return since 2025 is 8.13%[14][16][17] - Model name: Broad-based index heat; Model construction idea: Aggregate the total heat of component stocks in broad-based indices; Model construction process: Group the entire A-share sample according to the component stocks of the CSI 300, CSI 500, CSI 1000, CSI 2000, and "other" groups. Sum the total heat indicators of the component stocks in each group to obtain the heat of the four mainstream broad-based indices and the heat of stocks not included in these indices ("other" group). The formula is: $ \text{Total Heat} = \sum_{i=1}^{n} (\text{Browse Count}_i + \text{Self-selection Count}_i + \text{Click Count}_i) $ where $ n $ is the number of stocks in the group. The heat is normalized by dividing by the total market heat and multiplying by 10000, with a range of [0,10000][9][12] - Factor name: Total heat indicator; Factor construction idea: Aggregate the browsing, self-selection, and click counts of stocks; Factor construction process: Define the total heat indicator as the sum of the browsing, self-selection, and click counts of a stock, normalized by its proportion in the entire market on the same day, and multiplied by 10000. The formula is: $ \text{Total Heat} = \frac{(\text{Browse Count} + \text{Self-selection Count} + \text{Click Count})}{\text{Total Market Heat}} \times 10000 $ with a range of [0,10000][8] - Factor name: Concept heat; Factor construction idea: Aggregate the total heat of component stocks in different concepts; Factor construction process: Calculate the weekly heat change rate of each concept and smooth it using MA2. Construct two simple portfolios: select the top 5 concepts with the highest heat change rate each week, exclude the smallest 20% of stocks by market cap, and equally hold the top 10 stocks with the highest total heat in each concept to form the heat TOP portfolio. Similarly, select the bottom 10 stocks with the lowest total heat in each concept to form the BOTTOM portfolio. The formula is: $ \text{Heat Change Rate MA2} = \frac{\sum_{i=1}^{n} \text{Heat Change Rate}_i}{n} $ where $ n $ is the number of weeks. The BOTTOM portfolio's annualized return is 15.71%, with a maximum drawdown of 28.89%. The return since 2025 is 18.35%[28][30][32][33] Model backtest results - Broad-based index rotation strategy, annualized return 8.74%, maximum drawdown 23.5%, return since 2025 8.13%[17] - Broad-based index heat, CSI 300 heat change rate increased by 5.25%, CSI 500 heat change rate decreased by 13.72%[17] Factor backtest results - Total heat indicator, normalized range [0,10000][8] - Concept heat, BOTTOM portfolio annualized return 15.71%, maximum drawdown 28.89%, return since 2025 18.35%[33]

Group 1 - The core viewpoint of the news is that the China-South Korea Free Trade Zone concept has experienced a significant decline, with a drop of 3.07%, placing it among the top losers in the concept sector [1][2] - Within the China-South Korea Free Trade Zone concept, stocks such as Lianyungang and *ST Jinguang hit the daily limit down, while Qingdao King, Qingdao Port, and Rizhao Port saw notable declines [1][2] Group 2 - The China-South Korea Free Trade Zone concept faced a net outflow of 454 million yuan from major funds today, with 13 stocks experiencing net outflows, and 6 stocks seeing outflows exceeding 10 million yuan [2] - The stock with the highest net outflow was Qingdao King, which saw a net outflow of 260 million yuan, followed by Lianyungang and Rizhao Port with net outflows of 115 million yuan and 29 million yuan, respectively [2]

Group 1 - The graphite electrode concept sector increased by 2.57%, ranking first among concept sectors, with 17 stocks rising, including Ningxin New Materials which hit a 30% limit up, and Yong'an Pharmaceutical also hitting the limit up, while Dongfang Carbon, Xiangfenghua, and Better Ray saw increases of 11.54%, 5.78%, and 3.30% respectively [1][2] - The sector attracted a net inflow of 263 million yuan from main funds, with 10 stocks receiving net inflows, and 5 stocks seeing inflows exceeding 10 million yuan, led by Yong'an Pharmaceutical with a net inflow of 260 million yuan [2][3] - The top three stocks by net inflow ratio were Yong'an Pharmaceutical at 20.71%, China Baoan at 17.14%, and Xiangfenghua at 10.64% [3][4] Group 2 - The top performing stocks in the graphite electrode concept included Yong'an Pharmaceutical, with a daily increase of 10.00% and a turnover rate of 30.78%, followed by Daoshi Technology and Zhongke Electric with increases of 2.77% and 3.28% respectively [3][4] - The stocks with the largest declines included Fuan Co., which fell by 2.92%, and Guomin Technology and Shanshan Co., which decreased by 1.95% and 1.56% respectively [1][4] - The overall market performance showed a mixed trend, with several sectors experiencing declines, while the graphite electrode sector stood out with significant gains [2][3]

今日涨跌幅居前的概念板块 | 概念 | 今日涨跌幅（%） | 概念 | 今日涨跌幅（%） | | --- | --- | --- | --- | | 石墨电极 | 2.57 | PEEK材料 | -1.79 | | 重组蛋白 | 2.52 | 露营经济 | -1.56 | | 黄金概念 | 2.06 | 华为盘古 | -1.56 | | 兵装重组概念 | 1.99 | WiFi 6 | -1.55 | | 固态电池 | 1.86 | 共享单车 | -1.55 | | 钠离子电池 | 1.56 | AI语料 | -1.52 | | 供销社 | 1.53 | 工业母机 | -1.50 | | 草甘膦 | 1.44 | 华为欧拉 | -1.47 | | 创新药 | 1.42 | 柔性直流输电 | -1.47 | | 金属铅 | 1.39 | 华为手机 | -1.45 | 截至5月21日收盘，共享单车概念下跌1.55%，位居概念板块跌幅榜前列，板块内，信隆健康跌停，浙 文互联、博实结、中贝通信等跌幅居前，股价上涨的有4只，涨幅居前的有科力远、上海凤凰、赫美集 团等，分别上涨2.05%、1.81%、0.98%。 共享单 ...

Group 1 - The core viewpoint of the news is that the military equipment restructuring concept has seen a significant increase, with a rise of 3.43%, ranking sixth among concept sectors [1][2] - Within the military equipment restructuring sector, seven stocks experienced gains, with Zhongguangxue hitting the daily limit, and other notable performers including Jianshe Industrial, Dong'an Power, and Hunan Tianyan, which rose by 5.39%, 2.54%, and 2.51% respectively [1][2] Group 2 - The military equipment restructuring sector attracted a net inflow of 152 million yuan from main funds today, with five stocks receiving net inflows [2][3] - Zhongguangxue led the net inflow with 63.15 million yuan, followed by Jianshe Industrial, Chang'an Automobile, and Changcheng Military Industry, which saw net inflows of 45.55 million yuan, 32.11 million yuan, and 11.35 million yuan respectively [2][3] - In terms of fund inflow ratios, Zhongguangxue, Jianshe Industrial, and Changcheng Military Industry had the highest net inflow rates at 28.81%, 7.91%, and 7.22% respectively [3]