Quantitative Models and Construction Methods Model 1: Convertible Bond Valuation Model - **Model Name**: Convertible Bond Valuation Model - **Model Construction Idea**: The model aims to compare the valuation of convertible bonds with their underlying stocks using a time-series comparable valuation metric called "100 Yuan Conversion Premium Rate" and the median of "Adjusted YTM - Credit Bond YTM" to measure the relative allocation value between debt-biased convertible bonds and credit bonds[4][5][15] - **Model Construction Process**: - **100 Yuan Conversion Premium Rate**: Fit the relationship curve between the conversion premium rate and conversion value in the cross-sectional space at each time point, and substitute the conversion value = 100 into the fitting formula to obtain the "100 Yuan Conversion Premium Rate" - Formula: $$ y_{i}=\alpha_{0}+\,\alpha_{1}\cdot\,{\frac{1}{x_{i}}}+\epsilon_{i} $$ where \( y_{i} \) is the conversion premium rate of the i-th convertible bond, and \( x_{i} \) is the conversion value of the i-th convertible bond[43] - **Adjusted YTM - Credit Bond YTM**: Adjust the YTM of debt-biased convertible bonds by stripping out the impact of conversion terms - Formula: $$ \text{Adjusted YTM} = \text{Convertible Bond YTM} \times (1 - \text{Conversion Probability}) + \text{Expected Conversion Annualized Yield} \times \text{Conversion Probability} $$ The conversion probability is calculated using the BS model, substituting the closing price of the underlying stock, option exercise price, stock volatility, remaining term, and discount rate to calculate the conversion probability \( N(d2) \)[44] - **Model Evaluation**: The model provides a systematic approach to evaluate the relative allocation value of convertible bonds compared to their underlying stocks and credit bonds[15] Model 2: Convertible Bond Comprehensive Valuation Factor - **Model Name**: Convertible Bond Comprehensive Valuation Factor - **Model Construction Idea**: The model combines the deviation of the conversion premium rate and the theoretical value deviation (Monte Carlo model) to construct a comprehensive valuation factor for convertible bonds[6][19] - **Model Construction Process**: - **Conversion Premium Rate Deviation**: - Formula: $$ \text{Conversion Premium Rate Deviation} = \text{Conversion Premium Rate} - \text{Fitted Conversion Premium Rate} $$ - **Theoretical Value Deviation (Monte Carlo Model)**: - Formula: $$ \text{Theoretical Value Deviation} = \frac{\text{Convertible Bond Closing Price}}{\text{Theoretical Value}} - 1 $$ The Monte Carlo model fully considers the conversion, redemption, downward revision, and repurchase terms of convertible bonds, simulating 10,000 paths at each time point and using the same credit term interest rate as the discount rate to calculate the theoretical value of the convertible bond[20] - **Comprehensive Valuation Factor**: - Formula: $$ \text{Convertible Bond Comprehensive Valuation Factor} = \text{Rank}(\text{Conversion Premium Rate Deviation}) + \text{Rank}(\text{Theoretical Value Deviation (Monte Carlo Model)}) $$ - **Model Evaluation**: The comprehensive valuation factor performs well in the overall, balanced, and debt-biased convertible bonds, while the theoretical value deviation (Monte Carlo model) performs better in equity-biased convertible bonds[19][20] Model 3: Convertible Bond Style Rotation Model - **Model Name**: Convertible Bond Style Rotation Model - **Model Construction Idea**: The model uses convertible bond momentum and volatility deviation as market sentiment capture indicators to construct a convertible bond style rotation portfolio, with bi-weekly rebalancing[7][26] - **Model Construction Process**: - **Market Sentiment Capture Indicators**: - Formula: $$ \text{Convertible Bond Style Market Sentiment Capture Indicator} = \text{Rank}(\text{Convertible Bond 20-Day Momentum}) + \text{Rank}(\text{Volatility Deviation}) $$ - **Style Rotation Position Calculation**: - Example Calculation: | | Convertible Bond Equity-Biased Low Valuation | Convertible Bond Balanced Low Valuation | Convertible Bond Debt-Biased Low Valuation | | --- | --- | --- | --- | | Equal Weight Index | 1 | 2 | 3 | | Volatility Deviation Ranking | 2 | 1 | 3 | | Market Sentiment Capture Indicator | 3 | 3 | 6 | | Style Rotation Position | 50% | 50% | 0% | - **Model Evaluation**: The style rotation model effectively captures market sentiment and allocates positions accordingly, showing superior performance compared to the equal-weight index[26][27][28] Model Backtesting Results Convertible Bond Valuation Model - **100 Yuan Conversion Premium Rate**: Rolling three-year percentile at 98.70%, rolling five-year percentile at 94.90%[4][15] - **Adjusted YTM - Credit Bond YTM**: Current median at -2.36%[5][15] Convertible Bond Comprehensive Valuation Factor - **Equity-Biased Convertible Bond Low Valuation Index**: - Annualized Return: 26.10% - Annualized Volatility: 20.55% - Maximum Drawdown: -22.94% - IR: 1.27 - Calmar Ratio: 1.14 - Monthly Win Rate: 62.22%[23] - **Balanced Convertible Bond Low Valuation Index**: - Annualized Return: 14.80% - Annualized Volatility: 11.82% - Maximum Drawdown: -15.95% - IR: 1.25 - Calmar Ratio: 0.93 - Monthly Win Rate: 62.22%[23] - **Debt-Biased Convertible Bond Low Valuation Index**: - Annualized Return: 13.37% - Annualized Volatility: 9.43% - Maximum Drawdown: -17.78% - IR: 1.42 - Calmar Ratio: 0.75 - Monthly Win Rate: 57.78%[23] Convertible Bond Style Rotation Model - **Convertible Bond Style Rotation**: - Annualized Return: 25.27% - Annualized Volatility: 16.68% - Maximum Drawdown: -15.89% - IR: 1.51 - Calmar Ratio: 1.59 - Monthly Win Rate: 65.56%[32] - **Convertible Bond Low Valuation Equal Weight Index**: - Annualized Return: 14.71% - Annualized Volatility: 10.97% - Maximum Drawdown: -15.48% - IR: 1.34 - Calmar Ratio: 0.95 - Monthly Win Rate: 61.11%[32] - **Convertible Bond Equal Weight Index**: - Annualized Return: 9.75% - Annualized Volatility: 11.66% - Maximum Drawdown: -20.60% - IR: 0.84 - Calmar Ratio: 0.47 - Monthly Win Rate: 60.00%[32]

Report Industry Investment Rating No relevant information provided. Core Viewpoints of the Report - In July, the convertible bond market continued its upward trend, with the equal - weighted index significantly outperforming the weighted index. The median convertible bond price reached a maximum of 129 yuan, approaching the level at the beginning of 2022, but the structure showed that low - priced bonds were significantly higher than those at the beginning of 2022, while high - priced bonds were significantly lower [2][9]. - The July market was a "second - derivative" fluctuation, while the equity "first - derivative" remained positive. Before the September 3 parade, A - shares may have opportunities, and the dumbbell strategy (high - dividend + micro - cap stocks) may rebound. The convertible bond market will continue to follow the underlying stocks and remain strong [2]. - The new VAT policy on the interest income of bonds such as treasury bonds may increase the cost - effectiveness of stable and low - volatility convertible bonds, and the buying volume of bond - type convertible bonds and the entire convertible bond market may increase [2]. - After short - term winning - rate volatility pricing, the market will shift to odds - based advantages. It is recommended to pay attention to the cost - effectiveness improvement of bank convertible bonds and high - elasticity varieties, and the future will shift from position - based victory to structure - based victory [4]. Summary According to Relevant Catalogs 1. Review of the Convertible Bond Market in July: Recovery under Strong Equity - **Price and Index Performance**: The convertible bond market continued to rise in July, with a steeper upward slope compared to June. The equal - weighted index significantly outperformed the weighted index, and there was a slight pullback at the end of the month. The median convertible bond price reached a maximum of 129 yuan and closed at around 127 yuan at the end of the month [2][9]. - **Style and Sector Performance**: In July, small - cap and low - rating styles were dominant again, and their excess performance since the beginning of the year reached a new high. The pharmaceutical sector led the rise, while the financial sector significantly underperformed other sectors since 2025 [10][12][15]. - **Comparison with Underlying Stocks**: Convertible bonds slightly underperformed the underlying stocks, but the underperformance margin further narrowed compared to June. The convertible bond market showed strong performance overall, and its valuation advantage was significant [16][21]. - **Valuation Situation**: The convertible bond valuation confirmed an upward trend, with the 100 - yuan premium rate rising to a maximum of 33% in July. The current high - valuation problem is mainly reflected in the low - parity area, while the 120 - 130 yuan parity is still a valuation depression [22][24][27]. 2. Outlook for the Convertible Bond Market in August: Shifting from Position - Based Victory to Structure - Based Comparison - **Equity Market and Convertible Bond Market**: The short - term adjustment of the equity market is due to the full implementation of the market rotation and catch - up market, and the market has returned to a volatile state. Before the September 3 parade, A - shares may have opportunities, and the convertible bond market will follow the underlying stocks and remain strong [2][46]. - **Valuation of Convertible Bonds**: The high valuation of convertible bonds may be maintained because the overall risk of the stock market is controllable. However, the absolute valuation of bond - type convertible bonds is relatively high, and there are potential adjustment risks. After the short - term adjustment, they have certain cost - effectiveness [48][53][60]. - **Impact of VAT Policy**: The adjustment of the bond VAT policy may increase the attractiveness of bond - type convertible bonds. After the tax increase, the cost - effectiveness of pure bonds decreases, and the buying volume of bond - type convertible bonds may increase [63][66]. - **Cost - Effectiveness of Different Types of Convertible Bonds**: The cost - effectiveness of high - dividend and low - volatility convertible bonds such as bank convertible bonds may increase, and attention should also be paid to high - elasticity varieties and individual bonds with odds advantages [4]. 3. Bond Selection Directions and Targets in August - **Bond Selection Directions**: First, pay attention to the directions favored by the high - to - low shift in the August market, such as bank convertible bonds and some "bank - like" convertible bonds; second, focus on small - cap growth sectors such as self - controllability and national defense and military industries; third, pay attention to convertible bonds that are not subject to forced redemption or have been listed for less than 6 months; fourth, pay attention to convertible bonds that can replace underlying stocks [4]. - **Targets in August**: Low - volatility convertible bonds include Lvdong Convertible Bond, Hengyi Convertible Bond 2, etc.; stable convertible bonds include Bo 25 Convertible Bond, Guanghe Convertible Bond, etc.; high - volatility convertible bonds include Daotong Convertible Bond, Jiahe Convertible Bond, etc. [4]

Group 1 - The Zhongzheng Convertible Bond Index opened up by 0.1% [1] - Microchip Convertible Bond rose nearly 3% [1] - Julong Convertible Bond and Outong Convertible Bond increased by 2.8% [1] - Jinxian Convertible Bond fell over 2% [1]

Group 1 - The Zhongzheng Convertible Bond Index closed up 0.56% at 446.81, with a trading volume of 66.09 billion [1] - The top gainers included Seli Convertible Bond, which rose by 20%, Yong'an Convertible Bond, which increased by nearly 14%, and Huicheng Convertible Bond, which climbed by nearly 12% [1] - The top losers were Ceihui Convertible Bond, which fell over 8%, Yingji Convertible Bond, which dropped over 5%, and Feilu Convertible Bond, which decreased over 4% [1]

Group 1 - The China Securities Convertible Bond Index opened flat [1] - Jiuzhou Convertible Bond 2 increased by over 3% [1] - Runda Convertible Bond rose by over 2% [1] Group 2 - Henghui Convertible Bond declined by over 1% [1] - Yitian Convertible Bond and Outong Convertible Bond fell nearly 1% [1]

Group 1 - The Zhongzheng Convertible Bond Index opened lower by 0.04% [1] - Bojun Convertible Bond increased by nearly 4% [1] - Borui Convertible Bond rose over 3% [1] Group 2 - Outong Convertible Bond and Jiemei Convertible Bond both increased by over 2% [1] - Hongqiang Convertible Bond and Jing23 Convertible Bond fell nearly 2% [1]

Group 1 - The China Securities Convertible Bond Index fell by 0.28% at midday [1] - The convertible bonds of Oton, Hongchang, and Aofei experienced declines of 4.47%, 3.71%, and 3.44% respectively [1] - Zsheng Convertible Bond rose by 13.40%, while Feikai Convertible Bond increased by 3.76% [1]

Core Points - The China Convertible Bond Index closed up by 0.82%, reaching 425.39 points with a trading volume of 59.936 billion yuan [1] - The Wind Convertible Bond Equal-weighted Index increased by 1.27%, closing at 203.77 points [1] - Notable gainers included Oton Convertible Bond, Feikai Convertible Bond, Huaxiang Convertible Bond, Henghui Convertible Bond, and Huisheng Convertible Bond, with increases of 16.50%, 12.34%, 7.72%, 7.24%, and 6.92% respectively [1] - Significant decliners were Shengxun Convertible Bond, Huicheng Convertible Bond, Hongchang Convertible Bond, Hongqiang Convertible Bond, and Hongcheng Convertible Bond, with decreases of 6.00%, 2.10%, 1.61%, 1.20%, and 0.75% respectively [1]

Core Viewpoint - The convertible bond market in China has entered a technical bull market, with the China Convertible Bond Index reaching a new high since June 2015, driven by strong demand and limited supply [1][3][4]. Market Performance - As of March 17, the China Convertible Bond Index rose to 438.41 points, marking a significant increase of over 20% since September 2024, indicating a technical bull market [1][3][4]. - Nearly 50% of convertible bonds have seen a cumulative increase of over 20% since September 2024, with some bonds like Fuxin Convertible Bond and Outong Convertible Bond experiencing gains exceeding 200% [4][5]. Supply and Demand Dynamics - The convertible bond market is experiencing a supply-demand imbalance, with a reduction in the overall stock of convertible bonds due to strong redemptions and an increase in near-term bonds, while new issuances remain low [6]. - Institutional investors, including insurance funds and public funds, are increasing their allocation to convertible bonds in a low-interest-rate environment, contributing to the demand [6]. Valuation Outlook - The valuation of convertible bonds is expected to remain high due to anticipated scarcity in supply by 2025, with estimates suggesting a reduction in the stock of convertible bonds to around 650 billion yuan [8][9]. - The current price levels of certain convertible bonds are approaching those seen in 2021, raising concerns about potential overvaluation, but many institutions believe the pricing is justified given the market conditions [8][9]. Market Trends and Risks - The convertible bond market is closely tied to the performance of the equity market, particularly in the technology sector, which has shown significant gains this year [11]. - Investors are advised to be cautious of high volatility in the convertible bond market, especially if there is a shift in market style from growth to value stocks [11][12].