Computer-based systems, platforms, and modules manage and sell securities such as mortgage loans and TBA positions for mortgage loans held by the system user, such as a lender, in the relevant market for such securities. A single system simultaneously negotiates transactions with multiple investors and broker-dealers for such securities. The computer-based systems generate best execution analyses of trades of loans and TBA transactions. The computer-based systems generate hedge recommendations based on the loans and loan commitments owned by the lender and automatically executes those hedge recommendations on a best execution basis without intervention. The computer-based systems allow for lenders to enter into contracts to sell loans to investors who are not qualified investors by locking the spread while allowing for the loan price to fluctuate until a trade is consummated.