N-MFP2 0000742212 XXXXXXXX 2017-12-31 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. None N N Y Exempt Government N 45 86 236926687.83 238086973.53 245529595.04 251349274.09 255620164.87 291089357.72 302361647.60 303104924.99 300952285.48 303879455.81 0.5300 0.5400 0.5600 0.5700 0.5800 0.6600 0.6800 0.6900 0.6800 0.6900 0.00 440360476.26 440405654.35 503923.07 1471535.16 439438042.26 439435896.63 1.0000 0.0132 0.9997 0.9999 0.9999 0.9999 0.9999 C000000083 0.01 439438042.26 439435896.63 0.9997 0.9999 0.9999 0.9999 0.9999 3089801.54 4687258.09 2686044.43 3479522.45 3577254.67 4980712.77 2617694.65 3382470.27 2980384.93 3183612.91 12934020.29 16324716.69 0.0103 N Federal Farm Credit Banks Federal Farm Credit Banks 313313RR1 US313313RR17 U.S. Government Agency Debt Y N/A N/A 2018-01-11 2018-01-11 2018-01-11 N N N 0.0087 3193968.02 3193968.02 0.0073 N N Y N Federal Farm Credit Banks Federal Farm Credit Banks 3133EF3B1 US3133EF3B15 U.S. Government Agency Debt Y N/A N/A 2018-04-18 2018-04-18 2018-04-18 N N N 0.0121 5488021.00 5488021.00 0.0125 N N N N Federal Farm Credit Banks Federal Farm Credit Banks 3133EFVC8 US3133EFVC85 U.S. Government Agency Debt Y N/A N/A 2018-01-19 2018-01-19 2018-01-19 N N N 0.0116 2499822.50 2499822.50 0.0057 N N N N Federal Farm Credit Banks Federal Farm Credit Banks 3133EFT64 US3133EFT648 U.S. Government Agency Debt Y N/A N/A 2018-01-04 2018-04-04 2018-04-04 N N N 0.0156 2066881.17 2066881.17 0.0047 N N N N Federal Farm Credit Discount Notes Federal Farm Credit Discount Notes 313313B49 US313313B491 U.S. Government Agency Debt Y N/A N/A 2018-08-10 2018-08-10 2018-08-10 N N N 0.0154 351659.10 351659.10 0.0008 N N N N Federal Home Loan Bank Discount Notes Federal Home Loan Bank Discount Notes 313385SM9 US313385SM97 U.S. Government Agency Debt Y N/A N/A 2018-01-31 2018-01-31 2018-01-31 N N N 0.0115 5189602.40 5189602.40 0.0118 N N Y N Federal Home Loan Bank Discount Notes Federal Home Loan Bank Discount Notes 313385SP2 US313385SP29 U.S. Government Agency Debt Y N/A N/A 2018-02-02 2018-02-02 2018-02-02 N N N 0.0119 9988630.00 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2018-01-19 2018-01-19 N N N 0.0114 5996346.00 5996346.00 0.0136 N N Y N Federal Home Loan Banks Federal Home Loan Banks 313385SE7 US313385SE71 U.S. Government Agency Debt Y N/A N/A 2018-01-24 2018-01-24 2018-01-24 N N N 0.0120 13179606.28 13179606.28 0.0300 N N Y N Federal Home Loan Banks Federal Home Loan Banks 313385SK3 US313385SK32 U.S. Government Agency Debt Y N/A N/A 2018-01-29 2018-01-29 2018-01-29 N N N 0.0109 1608441.52 1608441.52 0.0037 N N Y N Federal Home Loan Banks Federal Home Loan Banks 313385TY2 US313385TY27 U.S. Government Agency Debt Y N/A N/A 2014-03-07 2018-03-07 2018-03-07 N N N 0.0131 4204884.00 4204884.00 0.0096 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130A7CX1 US3130A7CX17 U.S. Government Agency Debt Y N/A N/A 2018-03-19 2018-03-19 2018-03-19 N N N 0.0117 16982116.00 16982116.00 0.0387 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130AAX60 US3130AAX603 U.S. Government Agency Debt Y N/A N/A 2018-03-13 2018-03-13 2018-03-13 N N N 0.0123 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Federal Home Loan Banks Federal Home Loan Banks 3130ABFW1 US3130ABFW17 U.S. Government Agency Debt Y N/A N/A 2018-01-17 2018-04-17 2018-04-17 N N N 0.0135 4424862.78 4424862.78 0.0101 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130ABGZ3 US3130ABGZ39 U.S. Government Agency Debt Y N/A N/A 2018-01-19 2018-05-18 2018-05-18 N N N 0.0135 2999944.02 2999944.02 0.0068 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130ACT61 US3130ACT615 U.S. Government Agency Debt Y N/A N/A 2018-01-16 2018-11-16 2018-11-16 N N N 0.0136 6998832.19 6998832.19 0.0159 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130AC5L4 US3130AC5L46 U.S. Government Agency Debt Y N/A N/A 2018-01-11 2019-02-11 2019-02-11 N N N 0.0133 1010187.74 1010187.74 0.0023 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130ACE34 US3130ACE344 U.S. Government Agency Debt Y N/A N/A 2018-01-11 2019-09-11 2019-09-11 N N N 0.0137 3999496.68 3999496.68 0.0091 N N N N Federal Home Loan Banks Federal Home 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Government Agency Debt Y N/A N/A 2018-01-25 2019-01-25 2019-01-25 N N N 0.0146 3649987.08 3649987.08 0.0083 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130ABL53 US3130ABL531 U.S. Government Agency Debt Y N/A N/A 2018-03-20 2019-06-20 2019-06-20 N N N 0.0147 1600022.86 1600022.86 0.0036 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130ABL38 US3130ABL382 U.S. Government Agency Debt Y N/A N/A 2018-03-20 2019-06-20 2019-06-20 N N N 0.0147 1950027.86 1950027.86 0.0044 N N N N Federal Home Loan Banks Federal Home Loan Banks 3130AD6C1 US3130AD6C10 U.S. Government Agency Debt Y N/A N/A 2018-03-19 2019-12-19 2019-12-19 N N N 0.0147 1768974.87 1768974.87 0.0040 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313397TD3 US313397TD36 U.S. Government Agency Debt Y N/A N/A 2018-02-16 2018-02-16 2018-02-16 N N N 0.0110 1013325.25 1013325.25 0.0023 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3137EAED7 US3137EAED78 U.S. Government Agency Debt Y N/A N/A 2018-10-12 2018-10-12 2018-10-12 N N N 0.0163 2765713.88 2765713.88 0.0063 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3130AASV1 US3130AASV14 U.S. Government Agency Debt Y N/A N/A 2018-02-09 2018-05-09 2018-05-09 N N N 0.0105 2498858.45 2498858.45 0.0057 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3134G9K71 US3134G9K717 U.S. Government Agency Debt Y N/A N/A 2018-01-08 2018-01-08 2018-01-08 N N N 0.0132 2145070.72 2145070.72 0.0049 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3134G9L21 US3134G9L210 U.S. Government Agency Debt Y N/A N/A 2018-01-12 2018-01-12 2018-01-12 N N N 0.0133 2145125.70 2145125.70 0.0049 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3134G3XK1 US3134G3XK10 U.S. Government Agency Debt Y N/A N/A 2018-06-27 2018-06-27 2018-06-27 N N N 0.0133 1497880.50 1497880.50 0.0034 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 3134G8PF0 US3134G8PF04 U.S. Government Agency Debt Y N/A N/A 2018-03-08 2018-03-08 2018-03-08 N N N 0.0154 4001024.84 4001024.84 0.0091 N N N N Federal National Mortgage Association Federal National Mortgage Association 3135G0TG8 US3135G0TG87 U.S. Government Agency Debt Y N/A N/A 2018-02-08 2018-02-08 2018-02-08 N N N 0.0119 2498795.00 2498795.00 0.0057 N N N N Federal National Mortgage Association Federal National Mortgage Association 3135G0J61 US3135G0J618 U.S. Government Agency Debt Y N/A N/A 2018-03-28 2018-03-28 2018-03-28 N N N 0.0110 3196099.20 3196099.20 0.0073 N N N N Federal National Mortgage Association Federal National Mortgage Association 3135G0WJ8 US3135G0WJ89 U.S. Government Agency Debt Y N/A N/A 2018-05-21 2018-05-21 2018-05-21 N N N 0.0123 2947243.13 2947243.13 0.0067 N N N N State Street Institutional U.S. Government Money Market Fund - Premier Class State Street Institutional U.S. Government Money Market Fund - Premier Class 7839989D1 Investment Company Y N/A N/A 2030-12-31 2030-12-31 2030-12-31 N N N 0.0121 137083.24 137083.24 0.0003 N Y Y N Tri-Party Bank of Nova Scotia Tri-Party Bank of Nova Scotia BRTEK34X4 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash N N US Treasury 2024-03-31 2043-02-15 2.125000 - 3.625000 4123035.00 4087513.00 U.S. Treasuries (including strips) Y N/A N/A 2018-01-02 2018-01-02 2018-01-02 N N N 0.0135 4000000.00 4000000.00 0.0091 N Y Y N Tri-Party BNP Paribas Tri-Party BNP Paribas BRTEK33Z0 U.S. Government Agency Repurchase Agreement, collateralized only by U.S. Government Agency securities, U.S. Treasuries, and cash N N US Treasury 2024-01-15 0.625000 9043404.00 9206185.00 U.S. Treasuries (including strips) Government National Mortgage Association 2038-01-20 2041-05-20 2.375000 - 3.125000 1974289.00 2039660.00 Agency Mortgage-Backed Securities Y N/A N/A 2018-01-02 2018-01-02 2018-01-02 N N N 0.0140 11000000.00 11000000.00 0.0250 N Y Y N Tri-Party Citigroup Global Markets, Inc. 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BRTEK34J5 U.S. Government Agency Repurchase Agreement, collateralized only by U.S. Government Agency securities, U.S. Treasuries, and cash N N Federal Home Loan Mortgage Corp. 2018-06-13 4.875000 3029859.00 3073762.00 Agency Mortgage-Backed Securities Federal National Mortgage Association 2034-05-01 2043-04-01 3.500000 - 5.047000 75273.00 75292.00 Agency Mortgage-Backed Securities Government National Mortgage Association 2047-03-20 4.000000 1840014.00 1967073.00 Agency Mortgage-Backed Securities Y N/A N/A 2018-01-02 2018-01-02 2018-01-02 N N N 0.0134 5000000.00 5000000.00 0.0114 N Y Y N Tri-Party RBC Capital Markets Tri-Party RBC Capital Markets BRTEK33R8 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash N N Government National Mortgage Association 2024-08-20 2047-12-20 2.500000 - 8.000000 9854628.00 10201123.00 Agency Mortgage-Backed Securities Y N/A N/A 2018-01-02 2018-01-02 2018-01-02 N N N 0.0138 10000000.00 10000000.00 0.0228 N Y Y N Tri-Party TD Securities Tri-Party TD Securities BRTEK3406 U.S. Government Agency Repurchase Agreement, collateralized only by U.S. Government Agency securities, U.S. Treasuries, and cash N N Federal Farm Credit Bank 2038-08-26 2.710000 2214221.00 2038877.00 Agency Mortgage-Backed Securities US Treasury 2024-02-29 2.125000 18573380.00 18391732.00 U.S. Treasuries (including strips) Y N/A N/A 2018-01-02 2018-01-02 2018-01-02 N N N 0.0141 20000000.00 20000000.00 0.0455 N Y Y N US Treasury US Treasury 912796NY1 US912796NY17 U.S. Treasury Debt Y N/A N/A 2018-04-05 2018-04-05 2018-04-05 N N N 0.0121 9964124.00 9964124.00 0.0227 N Y Y N US Treasury US Treasury 912796PC7 US912796PC78 U.S. Treasury Debt Y N/A N/A 2018-05-03 2018-05-03 2018-05-03 N N N 0.0129 4976514.25 4976514.25 0.0113 N Y Y N US Treasury US Treasury 912796PH6 US912796PH65 U.S. Treasury Debt Y N/A N/A 2018-05-31 2018-05-31 2018-05-31 N N N 0.0147 5049460.36 5049460.36 0.0115 N Y Y N US Treasury US Treasury 912796PJ2 US912796PJ22 U.S. Treasury Debt Y N/A N/A 2018-06-07 2018-06-07 2018-06-07 N N N 0.0148 6697139.19 6697139.19 0.0152 N Y Y N US Treasury US Treasury 912796PL7 US912796PL77 U.S. Treasury Debt Y N/A N/A 2018-06-14 2018-06-14 2018-06-14 N N N 0.0149 983455.54 983455.54 0.0022 N Y Y N US Treasury US Treasury 912796MF3 US912796MF37 U.S. Treasury Debt Y N/A N/A 2018-06-21 2018-06-21 2018-06-21 N N N 0.0152 317733.33 317733.33 0.0007 N Y Y N US Treasury US Treasury 912796PM5 US912796PM50 U.S. Treasury Debt Y N/A N/A 2018-06-28 2018-06-28 2018-06-28 N N N 0.0156 13896233.68 13896233.68 0.0316 N Y Y N US Treasury US Treasury 912828VQ0 US912828VQ01 U.S. Treasury Debt Y N/A N/A 2018-07-31 2018-07-31 2018-07-31 N N N 0.0143 2002329.91 2002329.91 0.0046 N Y Y N US Treasury US Treasury 912828QT0 US912828QT05 U.S. Treasury Debt Y N/A N/A 2018-06-30 2018-06-30 2018-06-30 N N N 0.0149 5021093.05 5021093.05 0.0114 N Y Y N US Treasury Floating Rate Note US Treasury Floating Rate Note 912828N97 US912828N977 U.S. Treasury Debt Y N/A N/A 2018-01-02 2018-01-31 2018-01-31 N N N 0.0172 2120503.86 2120503.86 0.0048 N Y Y N US Treasury Note US Treasury Note 912796NX3 US912796NX34 U.S. Treasury Debt Y N/A N/A 2018-03-22 2018-03-22 2018-03-22 N N N 0.0120 3364964.54 3364964.54 0.0077 N Y Y N US Treasury Note US Treasury Note 912796LS6 US912796LS66 U.S. Treasury Debt Y N/A N/A 2018-03-29 2018-03-29 2018-03-29 N N N 0.0127 25924952.76 25924952.76 0.0590 N Y Y N US Treasury Note US Treasury Note 912828UR9 US912828UR92 U.S. Treasury Debt Y N/A N/A 2018-02-28 2018-02-28 2018-02-28 N N N 0.0091 5664577.16 5664577.16 0.0129 N Y Y N The Northwestern Mutual Life Insurance Company 2018-01-04 /s/Barbara E. Courtney Barbara E. Courtney Controller and Chief Accounting Officer