Abstract: In exemplary embodiments of a computer implemented method, system and computer program for managing asset portfolios, asset allocation results conventionally dictated by Modern Portfolio Theory are modified through implementation of at least a market timing enhancement which signals when an investor should exit individual declining investment portfolio components. By optimizing an oscillator averaging period, computing an oscillator time history and optimizing long and short margin percentages of each of a defined portfolio of investment components, a modified time history of total return for each component is calculated. After inputting the modified time histories into a Classic Modern Portfolio Theory algorithm, allocations are altered based in the current value of the oscillator.