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The Journal of Financial Data Science

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Machine Learning for Active Portfolio Management

Söhnke M. Bartram, Jürgen Branke, Giuliano De Rossi and Mehrshad Motahari
The Journal of Financial Data Science Summer 2021, jfds.2021.1.071; DOI: https://doi.org/10.3905/jfds.2021.1.071
Söhnke M. Bartram
is a professor of finance at the University of Warwick in Coventry, UK, and a research fellow at the Centre for Economic Policy Research (CEPR)
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Jürgen Branke
is a professor of operational research and systems at the University of Warwick in Coventry, UK
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Giuliano De Rossi
is an executive director at Goldman Sachs in London, UK
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Mehrshad Motahari
is a research associate at Cambridge Centre for Finance (CCFin) and Cambridge Endowment for Research in Finance (CERF) at the University of Cambridge in Cambridge, UK
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Abstract

Machine learning (ML) methods are attracting considerable attention among academics in the field of finance. However, it is commonly believed that ML has not transformed the asset management industry to the same extent as other sectors. This survey focuses on the ML methods and empirical results available in the literature that matter most for active portfolio management. ML has asset management applications for signal generation, portfolio construction, and trade execution, and promising findings have been reported. Reinforcement learning (RL), in particular, is expected to play a more significant role in the industry. Nevertheless, the performance of a sample of active exchange-traded funds (ETF) that use ML in their investments tends to be mixed. Overall, ML techniques show great promise for active portfolio management, but investors should be cautioned against their main potential pitfalls.

TOPICS: Big data/machine learning, portfolio construction, exchange-traded funds and applications, performance measurement

Key Findings

  • ▪ Machine learning (ML) methods have several advantages that can lead to successful applications in active portfolio management, including the ability to capture nonlinear patterns and a focus on prediction through ensemble learning.

  • ▪ ML methods can be applied to different steps of the investment process, including signal generation, portfolio construction, and trade execution, with reinforcement learning expected to play a more significant role in the industry.

  • ▪ Empirically, the investment performance of ML-based active exchange-traded funds is mixed.

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The Journal of Financial Data Science: 4 (3)
The Journal of Financial Data Science
Vol. 4, Issue 3
Summer 2022
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Machine Learning for Active Portfolio Management
Söhnke M. Bartram, Jürgen Branke, Giuliano De Rossi, Mehrshad Motahari
The Journal of Financial Data Science Jul 2021, jfds.2021.1.071; DOI: 10.3905/jfds.2021.1.071

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Machine Learning for Active Portfolio Management
Söhnke M. Bartram, Jürgen Branke, Giuliano De Rossi, Mehrshad Motahari
The Journal of Financial Data Science Jul 2021, jfds.2021.1.071; DOI: 10.3905/jfds.2021.1.071
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  • Article
    • Abstract
    • SIGNAL GENERATION
    • PORTFOLIO CONSTRUCTION
    • EXECUTION
    • A CLOSER LOOK AT RL
    • ACTIVE AI-DRIVEN ETFS
    • CONCLUSION
    • ACKNOWLEDGMENTS
    • ENDNOTES
    • REFERENCES
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