A system, method or computer program product for electronically constructing data indicative of an investible risk factor portfolio is disclosed. The method may include: constructing, by a processor(s), data indicative of an optimized factor portfolio, which may include: receiving data about a plurality of monthly returns for multiple years for a universe of asset classes; receiving data about investment returns; extracting a plurality of orthogonal risk factors, at least one factor characteristic, and an asset class-factor translation matrix by principal component analysis (PCA) from the data about the universe of asset classes; and optimizing to determine the optimized factor portfolio; constructing an investible custom mimicking portfolio based on the optimized factor portfolio, and any portfolio constraints, or any portfolio specifications, may include rebuilding using the asset class-factor translation matrix and an optimization process based on investment returns; and providing data indicative of the custom mimicking investible portfolio.