N-MFP2 0000742212 XXXXXXXX 2020-05-31 0000742212 S000000048 1 N N 002-89971 Mason Street Advisors, LLC 801-60721 BlackRock Advisors, LLC 801-47710 PricewaterhouseCoopers LLP Milwaukee WI The investment adviser has contracted with The Northwestern Mutual Life Insurance Company to provide certain administrative services for the fund. 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Courtney Barbara E. Courtney Controller and Chief Accounting Officer