N-MFP2 0000742212 XXXXXXXX 2021-12-31 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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Tri-Party Natixis S.A. 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