Group 1 - The cultivated diamond concept index declined by 0.44% as of the market close on September 29, ranking among the top decliners in the concept sector [1] - Within the cultivated diamond sector, companies such as Chao Hong Ji and Woerde experienced significant declines, while *ST Yazhen, Guoli Electronics, and Chujian New Materials saw increases of 4.52%, 2.86%, and 1.39% respectively [1] - The cultivated diamond sector experienced a net outflow of 376 million yuan in principal funds today, with 11 stocks seeing net outflows, and 7 stocks exceeding 10 million yuan in outflows [2] Group 2 - The top net outflow stock in the cultivated diamond sector was Guoji Jinggong, with a net outflow of 202 million yuan, followed by Jing Sheng Jidian and Chao Hong Ji with net outflows of 69.44 million yuan and 51.89 million yuan respectively [2] - Conversely, the stocks with the highest net inflows included Guoli Electronics, China Gold, and Yuyuan Shares, with net inflows of 19.02 million yuan, 13.97 million yuan, and 7.69 million yuan respectively [2] - The trading volume for Guoji Jinggong was 7.78%, while *ST Yazhen had a trading volume of 2.18% with a gain of 4.52% [3]

Group 1 - As of September 28, 154 public fund institutions participated in A-share market research activities, covering 28 industries and involving 605 listed companies with a total of 4,275 research instances [1] - From September 1 to 28, 70 listed companies saw stock price increases exceeding 20%, with 19 companies experiencing gains over 40%. The mechanical equipment sector stood out, with World achieving a remarkable increase of 113.77%, attracting attention from 30 public fund institutions [3] - During the same period, 44 listed companies were researched by public fund institutions at least 20 times, with Crystal Machine Electric leading with 81 instances of research [3] Group 2 - The research activities of public fund institutions were primarily concentrated in 18 industries, with the mechanical equipment sector being the most focused, involving 90 listed companies. Key companies included Huichuan Technology, Zoomlion, and Jepter [4] - The electronics sector ranked second, with 83 listed companies and a total of 702 research instances, highlighting companies like Shenzhen South Circuit, Jingchen Co., and Juguang Technology as focal points [4] - Other industries with high research activity included electric power equipment, pharmaceuticals, and basic chemicals [4]

- **Quantitative Timing Model: Volume Timing Signal** - **Model Name**: Volume Timing Signal - **Construction Idea**: The model uses volume indicators to assess market sentiment and provide timing signals for broad-based indices[23] - **Construction Process**: The model evaluates the trading volume of major indices (e.g., Shanghai Composite Index, CSI 300, etc.) and assigns a cautious view when volume contracts significantly[23][24] - **Evaluation**: The model provides a cautious perspective on market timing, especially during periods of volume contraction[23] - **Quantitative Sentiment Indicator: HS300 Upward Stock Count Ratio** - **Indicator Name**: HS300 Upward Stock Count Ratio - **Construction Idea**: The indicator measures the proportion of stocks within the CSI 300 index that have positive returns over a given period to gauge market sentiment[24] - **Construction Process**: - Formula: $ HS300\ Upward\ Stock\ Count\ Ratio = \frac{\text{Number of CSI 300 stocks with positive returns over N days}}{\text{Total number of CSI 300 stocks}} $ - The indicator is smoothed using two different window periods (N1=50, N2=35) to capture short-term and long-term trends[24][28] - **Evaluation**: The indicator effectively captures upward opportunities but struggles to predict downward risks. It is prone to missing gains during sustained market exuberance[25] - **Quantitative Sentiment Indicator: Moving Average Sentiment Indicator** - **Indicator Name**: Moving Average Sentiment Indicator - **Construction Idea**: The indicator uses an eight-moving-average system to assess the sentiment and trend of the CSI 300 index[31] - **Construction Process**: - Calculate the eight moving averages (parameters: 8, 13, 21, 34, 55, 89, 144, 233) for the CSI 300 index closing price[31] - Assign values based on the number of moving averages above or below the current price: - If the current price exceeds five moving averages, signal a bullish sentiment[32] - Smooth the sentiment indicator using two moving average windows (N1>N2) to generate buy/sell signals[31][32] - **Evaluation**: The indicator provides clear sentiment signals and aligns well with CSI 300 index trends[34] - **Market Alpha Environment Indicator: Cross-Sectional Volatility** - **Indicator Name**: Cross-Sectional Volatility - **Construction Idea**: Measures the dispersion of returns among index constituents to evaluate the alpha generation environment[36] - **Construction Process**: - Calculate the standard deviation of returns for index constituents (e.g., CSI 300, CSI 500, CSI 1000) over different time periods (quarterly, semi-annual, annual)[38] - Compare the volatility levels to historical percentiles to assess the alpha environment[38] - **Evaluation**: The indicator shows improved short-term alpha opportunities for CSI 300 and CSI 500, while CSI 1000 remains average[36] - **Market Alpha Environment Indicator: Time-Series Volatility** - **Indicator Name**: Time-Series Volatility - **Construction Idea**: Measures the volatility of index constituent returns over time to assess alpha generation potential[38] - **Construction Process**: - Calculate the weighted time-series volatility for index constituents (e.g., CSI 300, CSI 500, CSI 1000) over different time periods (quarterly, semi-annual, annual)[41] - Compare the volatility levels to historical percentiles to evaluate the alpha environment[41] - **Evaluation**: CSI 500 shows favorable alpha conditions, while CSI 300 and CSI 1000 remain average or below average[38] Backtesting Results for Models and Indicators - **Volume Timing Signal**: - Signal: Cautious for all major indices (Shanghai Composite, CSI 300, CSI 500, CSI 1000, etc.)[24] - **HS300 Upward Stock Count Ratio**: - Recent Value: Approximately 60%[25] - **Moving Average Sentiment Indicator**: - Current Sentiment: CSI 300 index is in a bullish sentiment zone[34] - **Cross-Sectional Volatility**: - CSI 300: Quarterly average volatility = 2.04%, percentile = 73.50% - CSI 500: Quarterly average volatility = 2.19%, percentile = 67.46% - CSI 1000: Quarterly average volatility = 2.40%, percentile = 66.14%[38] - **Time-Series Volatility**: - CSI 300: Quarterly average volatility = 0.63%, percentile = 61.70% - CSI 500: Quarterly average volatility = 0.45%, percentile = 74.60% - CSI 1000: Quarterly average volatility = 0.24%, percentile = 59.76%[41]

Core Viewpoint - The announcement details a significant equity change involving a major shareholder, Zhong Shujin, reducing their stake in Beijing World Diamond Tools Co., Ltd. to below 5%, which does not trigger a mandatory takeover bid [2][7]. Group 1: Equity Change Overview - The equity change involves both a reduction in shares held and passive dilution of holdings due to company actions [2][3]. - After the equity change, Zhong Shujin holds 7,547,500 shares, representing 5.00% of the company's total share capital [2][6]. - The change does not affect the company's controlling shareholder or actual controller [2][7]. Group 2: Passive Dilution Details - The passive dilution occurred due to the company's increase in total share capital from various actions, including stock incentive plans and asset acquisitions [3][4]. - Specific events include: - On September 29, 2022, the total share capital increased to 95,417,203 shares, diluting Zhong's stake from 7.11% to 7.09% [3]. - On November 4, 2022, following an asset acquisition, the total share capital rose to 109,580,960 shares, further diluting Zhong's stake to 6.17% [3]. - On October 10, 2024, after the cancellation of repurchased shares, Zhong's stake increased to 6.23% with a total share capital of 151,997,828 shares [3]. - On August 12, 2025, following another share cancellation, Zhong's stake was adjusted to 6.00% with a total share capital of 150,949,000 shares [4]. Group 3: Active Reduction Details - From December 5, 2024, to September 25, 2025, Zhong Shujin actively reduced their holdings by 1,923,406 shares, equating to 1.27% of the current total share capital [6]. - The overall passive dilution of Zhong's holdings during this period was 0.84% [4]. Group 4: Compliance and Future Actions - The equity change does not trigger a mandatory takeover bid and complies with relevant laws and regulations [7]. - Following this change, Zhong Shujin is no longer classified as a shareholder holding more than 5% of the company [7].

北京沃尔德金刚石工具股份有限公司 简式权益变动报告书 上市公司名称：北京沃尔德金刚石工具股份有限公司 股票上市地点：上海证券交易所 股票简称：沃尔德 股票代码：688028.SH 信息披露义务人：钟书进 住所/通讯地址：广东省深圳市龙华区建设路 股份变动性质：减少股份（减持）及整体被动稀释持股比例降至 5% 签署日期：2025 年 9 月 26 日 北京沃尔德金刚石工具股份有限公司简式权益变动报告书 信息披露义务人声明 本部分所述词语或简称与本报告书"释义"所述词语或简称具有相同含义。 一、信息披露义务人依据《中华人民共和国公司法》《中华人民共和国证券 法》《上市公司收购管理办法》《公开发行证券的公司信息披露内容与格式准则第 15 号—权益变动报告书》等法律、法规和规范性文件编制本报告书。 二、信息披露义务人签署本报告书已获得必要的授权和批准，其履行亦不违 反信息披露义务人公司章程或内部规则中的任何条款，或与之相冲突。 三、依据上述法律法规的规定，本报告书已全面披露了信息披露义务人在北 京沃尔德金刚石工具股份有限公司（以下简称"沃尔德"）中拥有权益的股份变 动情况。 | 目 录 | | --- | | 信息披 ...

证券代码：688028 证券简称：沃尔德 公告编号：2025-041 北京沃尔德金刚石工具股份有限公司 关于持股 5%以上股东减持股份至 5%以下的权益变动提示性公告 股东钟书进保证向北京沃尔德金刚石工具股份有限公司提供的信息内容不存在 任何虚假记载、误导性陈述或者重大遗漏，并对其真实性、准确性和完整性依法承担 法律责任。 本公司董事会及全体董事保证本公告内容不存在任何虚假记载、误导性陈述或者 重大遗漏，并对其内容的真实性、准确性和完整性承担法律责任。 重要内容提示： 本次权益变动属于股份减持及持有股份整体被动稀释，不触及要约收购。 股东钟书进所持股份来源于向特定对象发行股份及以资本公积转增股本 方式取得的股份。本次权益变动后，公司股东钟书进持有股份数量为 7,547,500 股，占公司当前总股本比例为 5.00%。 本次权益变动为持股 5%以上非第一大股东的股份减持及整体被动稀释， 不会导致公司控股股东、实际控制人发生变化。 一、本次权益变动基本情况 信息披露义务人本次权益变动系:一是通过上海证券交易所集中竞价交易减 持其所持有的公司股份，二是因公司增发股份导致总股本增加后持股比例被动减 少，三是因公司注销 ...

Group 1 - Inno Laser increased by 11.02% [1] - Huanghe Xuanfeng rose by 9.24% [1] - *ST Yazhen saw a rise of 5.0% [1] - World, Power Diamond, and Hengsheng Energy all experienced gains exceeding 2% [1]

Group 1 - The cultivated diamond sector experienced a significant rise at the beginning of trading, with Huanghe Xuanfeng hitting the daily limit up [1] - In addition to Huanghe Xuanfeng, Inno Laser surged over 10%, indicating strong market interest [1] - Other companies in the sector, including Power Diamond, Huifeng Diamond, World, and Sifangda, also saw increases in their stock prices [1]

Group 1 - A total of 22 companies were investigated by well-known institutions from September 15 to September 22 [1] - The automotive and electronics sectors received the most attention, followed by the biotechnology sector [1] - The company with the highest number of institutional investigations was Hanhigh Group, with 91 institutions participating, followed by World (86 institutions) and Ganli Pharmaceutical (84 institutions) [1] Group 2 - Notable investigations included companies such as Aobi Zhongguang (38 institutions), Welly Transmission (8 institutions), and Changhua Chemical (5 institutions) [2] - Other companies receiving significant attention were Chao Hong Ji (53 institutions), Sanxin Tourism (30 institutions), and Keshun Co. (30 institutions) [2] - Multiple institutions simultaneously investigated Hanhigh Group and Chao Hong Ji, indicating strong interest in these companies [2]

Market Performance - The general equipment sector increased by 1.52% on September 22, with Wald leading the gains [1] - The Shanghai Composite Index closed at 3828.58, up 0.22%, while the Shenzhen Component Index closed at 13157.97, up 0.67% [1] Top Gainers - Wald (688028) closed at 50.71, up 13.19% with a trading volume of 167,300 shares and a transaction value of 833 million [1] - DeMa Technology (688360) closed at 26.36, up 10.99% with a trading volume of 278,400 shares and a transaction value of 717 million [1] - Huafeng Co. (605100) closed at 27.13, up 10.02% with a trading volume of 82,400 shares and a transaction value of 217 million [1] Top Losers - Xun'an Technology (834950) closed at 22.74, down 6.96% with a trading volume of 22,800 shares and a transaction value of 52.29 million [2] - Qianjin Technology (873679) closed at 24.56, down 6.33% with a trading volume of 18,000 shares and a transaction value of 44.51 million [2] - Chicheng Co. (834407) closed at 22.04, down 5.49% with a trading volume of 50,700 shares and a transaction value of 113 million [2] Capital Flow - The general equipment sector experienced a net outflow of 1.097 billion from institutional investors, while retail investors saw a net inflow of 759 million [2] - The top stocks by net inflow from institutional investors included Sea Eagle Co. (603269) with 66.81 million and Aerospace Power (600343) with 54.43 million [3] - The top stocks by net outflow from institutional investors included Sea Eagle Co. (603269) with -31.54 million and Precision Technology (688627) with -24.73 million [3]