The research „Forecasting and Decision-Making models in the Context of Investment Portfolio Structuring„ describes methods, used to evaluate and choose more optimal and efficient solutions, linked with participation in stock market activities. A newly developed forecasting and decision-making model, based on classically applied and time – proven methodologies, had been created in the process of the current research conduction created. Its aim is to ease the related area decision-making as well as to rationalize the optimal investment portfolio structure determination process. The efficiency of the developed model was tested in practice and the acquired results were compared with previously available data in order to verify the hypothesis. The main problem, addressed and consequentially solved in the conducted research is the complex question of stocks market decision making synergized with the investment environment and portfolio structure critical analysis.