Understanding the Long-Only Minimum Variance Portfolio

Nick L. Gunther, Alec N. Kercheval and Ololade Sowunmi

Papers from arXiv.org

Abstract: For a covariance matrix coming from a factor model of returns, we investigate the relationship between the long-only global minimum variance portfolio and the asset exposures to the factors. In the case of a 1-factor model, we provide a rigorous and explicit description of the long-only solution in terms of the parameters of the covariance matrix. For $q>1$ factors, we provide a description of the long-only portfolio in geometric terms. The results are illustrated with empirical daily returns of US stocks.

Date: 2026-03
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