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Solving cardinality constrained mean-variance portfolio problems via MILP

Author

Listed:
  • Nasim Dehghan Hardoroudi

    (Aalto University School of Business)

  • Abolfazl Keshvari

    (Aalto University School of Business)

  • Markku Kallio

    (Aalto University School of Business)

  • Pekka Korhonen

    (Aalto University School of Business)

Abstract

Controlling the number of active assets (cardinality of the portfolio) in a mean-variance portfolio problem is practically important but computationally demanding. Such task is ordinarily a mixed integer quadratic programming (MIQP) problem. We propose a novel approach to reformulate the problem as a mixed integer linear programming (MILP) problem for which computer codes are readily available. For numerical tests, we find cardinality constrained minimum variance portfolios of stocks in S&P500. A significant gain in robustness and computational effort by our MILP approach relative to MIQP is reported. Similarly, our MILP approach also competes favorably against cardinality constrained portfolio optimization with risk measures CVaR and MASD. For illustrations, we depict portfolios in a portfolio map where cardinality provides a third criterion in addition to risk and return. Fast solution allows an interactive search for a desired portfolio.

Suggested Citation

  • Nasim Dehghan Hardoroudi & Abolfazl Keshvari & Markku Kallio & Pekka Korhonen, 2017. "Solving cardinality constrained mean-variance portfolio problems via MILP," Annals of Operations Research, Springer, vol. 254(1), pages 47-59, July.
    • Handle: RePEc:spr:annopr:v:254:y:2017:i:1:d:10.1007_s10479-017-2447-x
    DOI: 10.1007/s10479-017-2447-x
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    References listed on IDEAS

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