Strategic portfolio rebalancing: Integrating predictive models and adaptive optimization objectives in a dynamic market

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Adjusting investment strategy is one of the ways to handle dynamic market conditions. This study proposes a novel portfolio management strategy using appropriate optimization objectives for different stock market trends while also incorporating market trends and stock return predictions The optimization objectives that will be evaluated for different market trends are maximizing the Sharpe ratio, minimizing risk, and minimizing expected shortfall. This study utilizes simulation modelling with various predictive models on building the portfolios. The results show that, in an upward market trend, the strategy is to choose stocks with positive returns, and the objective is to maximize the Sharpe ratio. The portfolio that follows this strategy during upward market trends has greater returns than both the Indonesian Composite Index and LQ45, which serve as stock market benchmarks, with 90% certainty. Meanwhile, during the downward market trend, the strategy is to choose stocks with a negative correlation with the Indonesian Composite Index, and the proper optimization objective is to minimize risk. A portfolio that follows this strategy during downward market trends has greater returns than stock market benchmarks with 95% certainty. Across the evaluation period from 2018 to 2023, the portfolio using the proposed strategy outperforms both stock market benchmarks, with a higher quarterly Sharpe ratio of 0.3047 and cumulative return of 107.90%. The proposed portfolio has a higher quarterly return than the stock market benchmark with 99% certainty. Therefore, the proposed strategy shows a promising result in a dynamic market.

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    • Figure 1. Research methodology framework
    • Figure 2. Boxplot of return prediction squared error
    • Figure 3. Boxplot of return volatility prediction squared error
    • Figure 4. Proposed portfolio value comparison with IHSG and LQ45
    • Table 1. Final pool of stocks
    • Table 2. Time period of the data
    • Table 3. Data distribution for training and testing
    • Table 4. Hyperparameter list
    • Table 5. Data distribution for training and testing volatility prediction
    • Table 6. Optimization models
    • Table 7. Optimum hyperparameter and accuracy for stock market index prediction
    • Table 8. Performance comparison of portfolio with different objectives in upward trend condition
    • Table 9. Statistical result on port SR’s return compared to IHSG and LQ45 in upward trend condition
    • Table 10. Performance comparison of portfolio with different objectives in downward trend condition
    • Table 11. Statistical result on port risk’s return compared to IHSG and LQ45 in downward trend condition
    • Table 12. Proposed portfolio comparison with IHSG and LQ45
    • Table 13. Statistical result on proposed portfolio’s return compared to IHSG and LQ45
    • Conceptualization
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Data curation
      Adeline Clarissa
    • Formal Analysis
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Investigation
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Methodology
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Software
      Adeline Clarissa
    • Validation
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Visualization
      Adeline Clarissa
    • Writing – original draft
      Adeline Clarissa, Deddy Priatmodjo Koesrindartoto
    • Writing – review & editing
      Adeline Clarissa
    • Supervision
      Deddy Priatmodjo Koesrindartoto