Constrained Monotone Mean-Variance Problem with Random Coefficients

This paper studies the monotone mean-variance problem and the classical mean-variance problem with convex cone trading constraints in a market with random coefficients. We provide semiclosed optimal strategies and optimal values for both problems via certain backward stochastic differential equations (BSDEs). After noting the links between these BSDEs, we find that the two problems share the same optimal portfolio and optimal value. This generalizes the result of Shen and Zou [SIAM J. Financial Math., 13 (2022), pp. SC99-SC112] from deterministic coefficients to random ones.