How to improve the risk management of pension funds?

Written on 26 August 2022.


We are pleased to enclose recent research on retirement solutions and safe retirement income entitled “Improving Interest Rate Risk Hedging Strategies through Regularization, by Daniel Mantilla-Garcia, Lionel Martellini, Vincent Milhau, and Hector Enrique Ramirez, published in the Financial Analysts Journal, a CFA Institute publication.

 

Daniel Mantilla-Garcia, EDHEC PhD (2012), Research Associate, EDHEC-Risk Institute, Assistant Professor of Finance, Universidad de Los Andes

Lionel Martellini, Professor of Finance, EDHEC Business School, Director, EDHEC-Risk Institute 

Vincent Milhau, Research Director, EDHEC-Risk Institute

Hector Enrique Ramirez-Garrido, Research Assistant, Universidad de Los Andes

 

Financial Analysts Journal, CFA Institute

 

The effectiveness of duration and convexity hedging strategies deteriorates in the presence of non-parallel shifts of the yield curve. In the absence of appropriate constraints, the extension of these strategies accounting for changes in the shape of the yield curve generates unstable weights and extreme leverage, leading to poor out-of-sample hedging performance.

To address this conundrum, authors recast the bond portfolio immunization problem as a multifactor optimization program with leverage constraints and weight regularization. These regularized immunization strategies offer a robust improvement in hedging performance and are particularly well-suited to secure future cash flow needs such as pension liabilities.

 

 

 

“An important application of what we do in the paper, is to better manage the risk of pension funds, particularly, to construct more robust pension liability hedging portfolios” says Daniel Mantilla, EDHEC-Risk Institute Associate Researcher and PhD, EDHEC Business School.

 

KEY FINDINGS

  1. Hedging against non-parallel shifts in the yield curve is of major practical importance for institutions like pension funds or insurance companies endowed with long-term liabilities
  2. We use machine learning techniques to build more robust hedging strategies that protect investors against general shifts in the yield curve
  3. The proposed immunization strategies offer a substantial improvement in hedging performance and a strong reduction in leverage and turnover compared to the standard unconstrained approach to bond portfolio immunization

 

Figure 2. Funding Ratio and First-Order Sensitivities to the NS Factors of the Retirement Bond (Continuous Line), the Duration Barbell (Dashed Line), and the Duration-Convexity (Dotted Line) strategies implemented with k þ 1 Bonds, Where k Is the Number of Factor Sensitivities Matched by the Strategy (2 and 3 for the Duration and Duration-Convexity Strategies, Respectively)

 

Figure 4. Funding Ratio and First-Order Sensitivities to the NS Factors of the Retirement Bond (Continuous Line), and the Hedging Strategies Implemented with All the Bonds Available and with a Lasso Regularization that Restricts the Gross Leverage below Three at All Times

 

The article is in open access at the following link: doi.org/10.1080/0015198X.2022.2095193.

 

#interestratehedging #pensionliabilityhedging #robustbondportfolioimmunization

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