N-MFP LIVE N 2015-05-31 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. None N N Y Prime 49 88 421849364.74 58274149.55 57648025.45 422475488.84 0.0004 1.0001 2015-05-31 1.0001 2015-05-31 C000000083 0.01 422475488.84 1.00 2667082.63 13506955.79 10839873.16 0.0000 1.0001 2015-05-31 1.0001 2015-05-31 ABN Amro Funding USA LLC ABN Amro Funding USA LLC, 0.20% 00084CTC6 Financial Company Commercial Paper First Tier Security 2015-06-12 2015-06-12 N N N 6000000.00 5999566.67 0.0142 N 5999708.40 5999708.40 ABN Amro Funding USA LLC ABN Amro Funding USA LLC, 0.32% 00084CW81 Financial Company Commercial Paper First Tier Security 2015-09-08 2015-09-08 N N N 7000000.00 6993715.55 0.0166 N 6995616.60 6995616.60 Alpine Securitization Corp. Alpine Securitization Corp., 0.20% 02086MT87 Asset Backed Commercial Paper First Tier Security 2015-06-08 2015-06-08 N N N 8000000.00 7999600.00 0.0189 N 7999682.40 7999682.40 ANZ New Zealand Int'l., Ltd. ANZ New Zealand Int'l., Ltd., 1.85% 00182EAQ2 Other Instrument Fixed Rate Note First Tier Security 2015-10-15 2015-10-15 N N N 990000.00 995379.68 0.0024 N 994954.95 994954.95 Australia & New Zealand Australia & New Zealand, 0.302% 05253MEG5 Financial Company Commercial Paper First Tier Security 2015-08-25 2015-11-25 N N N 4000000.00 4000000.00 0.0095 N 3999620.00 3999620.00 Bank of Montreal Bank of Montreal, 0.517% 06367VHK4 Other Note First Tier Security 2015-06-24 2015-09-24 N N N 10000000.00 10007567.76 0.0237 N 10007920.00 10007920.00 Bank of Montreal Bank of Montreal, 0.737% 06366RHB4 Other Note First Tier Security 2015-06-11 2015-09-11 N N N 4873000.00 4879173.76 0.0115 N 4879559.06 4879559.06 Bank of Montreal Bank of Montreal, 0.80% 06366RJH9 Other Instrument Fixed Rate Note First Tier Security 2015-11-06 2015-11-06 N N N 4300000.00 4308109.42 0.0102 N 4307645.40 4307645.40 Bank of Nova Scotia/Houston Bank of Nova Scotia/Houston, 0.413% 06417HHQ2 Certificate of Deposit First Tier Security 2015-06-29 2015-09-28 N N N 3400000.00 3401287.04 0.0081 N 3401234.20 3401234.20 The Bank of Tokyo-Mitsubishi UFJ, Ltd. The Bank of Tokyo-Mitsubishi UFJ, Ltd., 2.45% 064255AD4 Other Instrument Fixed Rate Note First Tier Security 2015-09-11 2015-09-11 N N N 12000000.00 12065021.58 0.0286 N 12062892.00 12062892.00 Barclays Bank PLC Barclays Bank PLC, 0.14% BRSTPAL53 Other Instrument Time Deposit First Tier Security 2015-06-01 2015-06-01 N N N 7510000.00 7510000.00 0.0178 N 7510000.00 7510000.00 Bedford Row Funding Corp. Bedford Row Funding Corp., 0.33% 07644BWN8 Asset Backed Commercial Paper First Tier Security 2015-09-22 2015-09-22 N N N 3000000.00 2996837.50 0.0071 N 2997544.80 2997544.80 Cafco LLC Cafco LLC, 0.29% 12476FTR7 Asset Backed Commercial Paper First Tier Security 2015-06-25 2015-06-25 N N N 3000000.00 2999371.67 0.0071 N 2999680.50 2999680.50 Cafco LLC Cafco LLC, 0.29% 12476FU79 Asset Backed Commercial Paper First Tier Security 2015-07-07 2015-07-07 N N N 5000000.00 4998469.44 0.0118 N 4999149.50 4999149.50 Chariot Funding LLC Chariot Funding LLC, 0.26% 15963UVD5 Asset Backed Commercial Paper First Tier Security 2015-08-13 2015-08-13 N N N 3000000.00 2998375.00 0.0071 N 2998727.10 2998727.10 Charta LLC Charta LLC, 0.32% 16115XW27 Asset Backed Commercial Paper First Tier Security 2015-09-02 2015-09-02 N N N 1975000.00 1973332.22 0.0047 N 1973783.40 1973783.40 Collateralized Commercial Paper Co. LLC Collateralized Commercial Paper Co. LLC, 0.25% 19422GW18 Asset Backed Commercial Paper First Tier Security 2015-09-01 2015-09-01 N N N 1750000.00 1748857.64 0.0041 N 1748947.02 1748947.02 Collateralized Commercial Paper Co. LLC Collateralized Commercial Paper Co. LLC, 0.45% 19422GX58 Asset Backed Commercial Paper First Tier Security 2015-10-05 2015-10-05 N N N 5000000.00 4992000.00 0.0118 N 4994553.50 4994553.50 Commonwealth Bank of Australia/New York NY Commonwealth Bank of Australia/New York NY, 0.277% 20272AMF0 Financial Company Commercial Paper First Tier Security 2015-08-19 2016-02-19 N N N 5000000.00 5000000.00 0.0118 N 5000405.00 5000405.00 Commonwealth Bank of Australia/New York NY Commonwealth Bank of Australia/New York NY, 1.25% 20271RAB6 Other Instrument Fixed Rate Note First Tier Security 2015-09-18 2015-09-18 N N N 8000000.00 8022884.36 0.0190 N 8019704.00 8019704.00 CRC Funding LLC CRC Funding LLC, 0.25% 12622VT46 Asset Backed Commercial Paper First Tier Security 2015-06-04 2015-06-04 N N N 4000000.00 3999861.11 0.0095 N 3999924.00 3999924.00 CRC Funding LLC CRC Funding LLC, 0.29% 12622VU77 Asset Backed Commercial Paper First Tier Security 2015-07-07 2015-07-07 N N N 5000000.00 4998469.44 0.0118 N 4999149.50 4999149.50 Credit Industriel Et Credit Industriel Et, 0.38% 22536TEP4 Certificate of Deposit First Tier Security 2015-08-03 2015-08-03 N N N 3000000.00 3000000.00 0.0071 N 3001103.70 3001103.70 Credit Suisse New York Credit Suisse New York, 0.26% 2254EBU25 Financial Company Commercial Paper First Tier Security 2015-07-02 2015-07-02 N N N 4000000.00 3999046.67 0.0095 N 3999138.80 3999138.80 DNB Bank ASA DNB Bank ASA, 0.06% BRSTPCYH9 Other Instrument Time Deposit First Tier Security 2015-06-01 2015-06-01 N N N 20000000.00 20000000.00 0.0473 N 20000000.00 20000000.00 Erste Abwicklungsanstalt Erste Abwicklungsanstalt, 0.25% 29604DTB6 Financial Company Commercial Paper First Tier Security 2015-06-11 2015-06-11 N N N 6000000.00 5999500.00 0.0142 N 5999794.20 5999794.20 General Electric Capital Corp. General Electric Capital Corp., 0.24% 36959JTG8 Financial Company Commercial Paper First Tier Security 2015-06-16 2015-06-16 N N N 6000000.00 5999320.00 0.0142 N 5999745.00 5999745.00 General Electric Capital Corp. General Electric Capital Corp., 3.50% 36962G4L5 Other Note First Tier Security 2015-06-29 2015-06-29 N N N 3000000.00 3008056.60 0.0071 N 3007368.00 3007368.00 General Electric Captial Corp. General Electric Captial Corp., 0.474% 36962GU51 Other Note First Tier Security 2015-07-08 2016-01-08 N N N 9446000.00 9456315.59 0.0224 N 9456485.06 9456485.06 HSBC Bank PLC HSBC Bank PLC, 3.10% 44328MAL8 Other Note First Tier Security 2016-05-24 2016-05-24 N N N 4000000.00 4095063.65 0.0097 N 4096656.00 4096656.00 HSBC Bank PLC HSBC Bank PLC, 3.50% 44328MAB0 Other Note First Tier Security 2015-06-28 2015-06-28 N N N 5000000.00 5012377.39 0.0119 N 5012500.00 5012500.00 ING Bank NV ING Bank NV, 2.00% 449786AR3 Other Note First Tier Security 2015-09-25 2015-09-25 N N N 6000000.00 6029622.55 0.0143 N 6028176.00 6028176.00 KBC Bank KBC Bank, 0.12% 4823T0Z36 Certificate of Deposit First Tier Security 2015-06-02 2015-06-02 N N N 18000000.00 18000000.00 0.0426 N 17999890.20 17999890.20 Macquarie Bank, Ltd. Macquarie Bank, Ltd., 3.45% 55608PAB0 Other Note First Tier Security 2015-07-27 2015-07-27 N N N 8000000.00 8035821.06 0.0190 N 8038304.00 8038304.00 Mitsubishi UFJ Trust and Banking Corp./NY Mitsubishi UFJ Trust and Banking Corp./NY, 0.26% 60682AVQ6 Certificate of Deposit First Tier Security 2015-07-23 2015-07-23 N N N 5000000.00 5000000.00 0.0118 N 5000053.00 5000053.00 Mizuho Bank, Ltd. Mizuho Bank, Ltd., 0.27% 60688L5A0 Certificate of Deposit First Tier Security 2015-06-15 2015-06-15 N N N 5000000.00 5000000.00 0.0118 N 5000183.50 5000183.50 National Australia Bank of New York National Australia Bank of New York, 0.90% 63254AAF5 Other Note First Tier Security 2016-01-20 2016-01-20 N N N 3000000.00 3007776.55 0.0071 N 3008634.00 3008634.00 Natixis Natixis, 0.28% 63873FMA3 Certificate of Deposit First Tier Security 2015-06-03 2015-06-03 N N N 15000000.00 15000000.00 0.0355 N 15000390.00 15000390.00 Norinchukin Bank NY Norinchukin Bank NY, 0.325% 65602TGY1 Certificate of Deposit First Tier Security 2015-06-24 2015-08-24 N N N 10000000.00 10000000.00 0.0237 N 10000260.00 10000260.00 Norinchukin Bank NY Norinchukin Bank NY, 0.33% 65602TND9 Certificate of Deposit First Tier Security 2015-06-15 2015-11-12 N N N 5000000.00 5000000.00 0.0118 N 5000325.00 5000325.00 Royal Bank of Canada Royal Bank of Canada, 0.272% 78009NSG2 Certificate of Deposit First Tier Security 2015-06-10 2015-11-10 N N N 2000000.00 2000000.00 0.0047 N 2000030.00 2000030.00 Skandinaviska Enskilda Banken AB Skandinaviska Enskilda Banken AB, 0.06% BRSTPD738 Other Instrument Time Deposit First Tier Security 2015-06-01 2015-06-01 N N N 7000000.00 7000000.00 0.0166 N 7000000.00 7000000.00 Skandinaviska Enskilda Banken AB Skandinaviska Enskilda Banken AB, 0.25% 83051HV94 Certificate of Deposit First Tier Security 2015-07-02 2015-07-02 N N N 12000000.00 12000000.00 0.0284 N 12001472.40 12001472.40 Standard Chartered Bank Standard Chartered Bank, 0.30% 85325TBG9 Certificate of Deposit First Tier Security 2015-09-11 2015-09-11 N N N 3000000.00 3000000.00 0.0071 N 3000000.00 3000000.00 Starbird Funding Corp. Starbird Funding Corp., 0.25% 85520MTB9 Asset Backed Commercial Paper First Tier Security 2015-06-11 2015-06-11 N N N 10000000.00 9999166.67 0.0237 N 9999458.00 9999458.00 Sumitomo Mitsui Banking Corp. Sumitomo Mitsui Banking Corp., 1.35% 865622AU8 Other Note First Tier Security 2015-07-18 2015-07-18 N N N 18000000.00 18021379.17 0.0427 N 18020124.00 18020124.00 Sumitomo Mitsui Trust Sumitomo Mitsui Trust, 0.35% 86563KYN7 Certificate of Deposit First Tier Security 2015-10-23 2015-10-23 N N N 8000000.00 8000000.00 0.0189 N 8000942.40 8000942.40 Svenska Handelsbanken AB Svenska Handelsbanken AB, 0.06% BRSTPD3J7 Other Instrument Time Deposit First Tier Security 2015-06-01 2015-06-01 N N N 20000000.00 20000000.00 0.0473 N 20000000.00 20000000.00 Toronto Dominion Bank NY Toronto Dominion Bank NY, 0.271% 89112UVA6 Certificate of Deposit First Tier Security 2015-06-04 2015-09-04 N N N 5750000.00 5750023.69 0.0136 N 5750069.00 5750069.00 The Toronto-Dominion Bank The Toronto-Dominion Bank, 0.48% 89114QAN8 Other Note First Tier Security 2015-08-06 2015-11-06 N N N 5000000.00 5003939.89 0.0118 N 5004595.00 5004595.00 US Treasury US Treasury, 0.255% 912796GN3 Treasury Debt First Tier Security 2015-05-26 2015-05-26 N N N 4000000.00 3989944.45 0.0094 N 3989800.00 3989800.00 US Treasury US Treasury, 1.75% 912828NP1 Treasury Debt First Tier Security 2015-07-31 2015-07-31 N N N 10000000.00 10028759.48 0.0237 N 10028520.00 10028520.00 US Treasury Floating Rate Note US Treasury Floating Rate Note, 0.06% 912828WK2 Treasury Debt First Tier Security 2015-06-01 2016-01-31 N N N 5000000.00 4997849.52 0.0118 N 4999870.00 4999870.00 US Treasury Floating Rate Note US Treasury Floating Rate Note, 0.089% 912828K41 Treasury Debt First Tier Security 2015-06-01 2017-04-30 N N N 3000000.00 2999878.30 0.0071 N 3000156.00 3000156.00 US Treasury Floating Rate Note US Treasury Floating Rate Note, 0.104% 912828H60 Treasury Debt First Tier Security 2015-06-01 2017-01-31 N N N 10000000.00 10000000.00 0.0237 N 10003840.00 10003840.00 Wells Fargo & Co. Wells Fargo & Co., 1.50% 94974BFE5 Other Instrument Fixed Rate Note First Tier Security 2015-07-01 2015-07-01 N N N 9808000.00 9818168.63 0.0232 N 9817278.37 9817278.37 Wells Fargo Bank NA Wells Fargo Bank NA, 0.555% 94985H5G5 Other Note First Tier Security 2015-07-20 2015-07-20 N N N 4000000.00 4001488.41 0.0095 N 4001348.00 4001348.00 Westpac Banking Corp. Westpac Banking Corp., 0.31% 9612C1ZB6 Financial Company Commercial Paper First Tier Security 2015-12-11 2015-12-11 N N N 3000000.00 2994962.50 0.0071 N 2995982.10 2995982.10 Westpac Banking Corp. Westpac Banking Corp., 0.95% 961214BY8 Other Note First Tier Security 2016-01-12 2016-01-12 N N N 4700000.00 4713197.46 0.0112 N 4715312.60 4715312.60 Wheaton College/IL Wheaton College/IL, 0.17% 96272PAB9 Variable Rate Demand Note First Tier Security 2015-06-05 2015-06-05 Y Wheaton College/IL N/A N/A N Y Credit Enhancer BMO Harris Bank NA N/A N/A 17000000.00 17000000.00 0.0402 N 17000000.00 17000000.00 Working Capital Management Co. Working Capital Management Co., 0.13% 98137ST32 Asset Backed Commercial Paper First Tier Security 2015-06-03 2015-06-03 N N N 12000000.00 11999826.67 0.0284 N 11999782.80 11999782.80