The SECTOR-BASED PORTFOLIO CONSTRUCTION PLATFORM APPARATUSES, METHODS AND SYSTEMS (“SPC”) transform user data request via SPC components into sector-based portfolio investment transaction records. In one implementation, the SPC may provide an electronic user interface (UI) (e.g., web-based, mobile, etc.) for a user to construct a sector-based investment portfolio, to obtain performance prediction for the portfolio's allocation strategies by performance back-testing of selected sector funds and indices.