N-MFP LIVE N 2013-08-31 0000742212 S000000048 1 N N 002-89971 Mason Street Advisors, LLC 801-60721 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 38 64 485109246.11 54025179.94 53605846.32 485528579.73 0.0015 1.0000 2013-08-31 1.0000 2013-08-31 C000000083 0.01 485528579.73 1.00 6430093.26 27171011.66 20740918.40 0.0003 1.0000 2013-08-31 1.0000 2013-08-31 Alpine Securitization Alpine Securitization, 0.14% 02086LW36 Asset Backed Commercial Paper First Tier Security 2013-09-03 2013-09-03 N N N 5800000.00 5799932.33 0.0119 N 5799929.24 5799929.24 Alpine Securitization Alpine Securitization, 0.14% 02086LW69 Asset Backed Commercial Paper First Tier Security 2013-09-06 2013-09-06 N N N 5600000.00 5599869.33 0.0115 N 5599880.16 5599880.16 Alpine Securitization Alpine Securitization, 0.14% 02086LWL6 Asset Backed Commercial Paper First Tier Security 2013-09-20 2013-09-20 N N N 7100000.00 7099447.78 0.0146 N 7099461.82 7099461.82 American Honda Finance Corp. American Honda Finance Corp., 0.293% 02666QL92 Other Instrument Floating Rate Note First Tier Security 2013-09-05 2013-12-05 N N N 12500000.00 12500000.00 0.0257 N 12500487.50 12500487.50 American Honda Finance Corp. American Honda Finance Corp., 0.395% 02666QL68 Other Instrument Floating Rate Note First Tier Security 2013-10-08 2014-04-08 N N N 5000000.00 5004000.13 0.0103 N 5004275.00 5004275.00 Atlantic Asset Secur LLC Atlantic Asset Secur LLC, 0.07% 04821TW35 Asset Backed Commercial Paper First Tier Security 2013-09-03 2013-09-03 N N N 20000000.00 19999883.33 0.0412 N 19999756.00 19999756.00 Bank of America NA Bank of America NA, 0.26% 06052WB28 Financial Company Commercial Paper First Tier Security 2013-09-19 2013-09-19 N N N 6000000.00 6000000.00 0.0124 N 6000199.80 6000199.80 Bank of America NA Bank of America NA, 1.685% 06051GEF2 Other Instrument Floating Rate Note First Tier Security 2013-10-30 2014-01-30 N N N 7500000.00 7538211.80 0.0155 N 7535550.00 7535550.00 Bank Of America Na Bank Of America Na, 0.18% 06052WJ46 Financial Company Commercial Paper First Tier Security 2013-09-24 2013-09-24 N N N 5000000.00 5000000.00 0.0103 N 5000208.50 5000208.50 Bank of Nova Scotia/Houston Bank of Nova Scotia/Houston, 0.686% 06417EKJ1 Other Instrument Floating Rate Note First Tier Security 2013-10-18 2013-10-18 N N N 15000000.00 15008494.49 0.0309 N 15013485.00 15013485.00 Barclays Bank PLC Barclays Bank PLC, 1.308% 06740P3N4 Other Instrument Floating Rate Note First Tier Security 2013-10-15 2014-01-13 N N N 7970000.00 7998794.43 0.0165 N 7999313.66 7999313.66 BP Capital Markets PLC BP Capital Markets PLC, 0.875% 05565QBS6 Other Instrument Floating Rate Note First Tier Security 2013-09-11 2014-03-11 N N N 13110000.00 13150566.45 0.0271 N 13148281.20 13148281.20 Caterpillar Financial Caterpillar Financial, 0.07% 14912DW96 Other Commercial Paper First Tier Security 2013-09-09 2013-09-09 N N N 8500000.00 8499851.25 0.0175 N 8499787.50 8499787.50 Caterpillar Financial Caterpillar Financial, 0.08% 14912DWP0 Other Commercial Paper First Tier Security 2013-09-23 2013-09-23 N N N 10000000.00 9999488.89 0.0206 N 9999400.00 9999400.00 Cisco Systems, Inc. Cisco Systems, Inc., 0.523% 17275RAL6 Other Instrument Floating Rate Note First Tier Security 2013-09-14 2014-03-14 N N N 5006000.00 5012909.19 0.0103 N 5013083.49 5013083.49 Fcar Owner Trust I Fcar Owner Trust I, 0.19% 3024A0X34 Asset Backed Commercial Paper First Tier Security 2013-10-03 2013-10-03 N N N 13500000.00 13497648.75 0.0278 N 13498304.40 13498304.40 Fcar Owner Trust I Fcar Owner Trust I, 0.24% 3024A0W50 Asset Backed Commercial Paper First Tier Security 2013-09-05 2013-09-05 N N N 5000000.00 4999833.33 0.0103 N 4999916.50 4999916.50 Federal Home Loan Bank Federal Home Loan Bank, 0.04% 313397LU3 Government Agency Debt First Tier Security 2013-09-16 2013-09-16 N N N 10300000.00 10299816.89 0.0212 N 10299958.80 10299958.80 General Electric Capital General Electric Capital, 0.07% 36959HWA1 Financial Company Commercial Paper First Tier Security 2013-09-10 2013-09-10 N N N 5000000.00 4999902.78 0.0103 N 4999893.00 4999893.00 General Electric Capital General Electric Capital, 0.15% 36959HYV3 Financial Company Commercial Paper First Tier Security 2013-11-29 2013-11-29 N N N 8500000.00 8496812.50 0.0175 N 8497185.65 8497185.65 General Electric Capital General Electric Capital, 0.16% 36959HWS2 Financial Company Commercial Paper First Tier Security 2013-09-26 2013-09-26 N N N 5000000.00 4999422.22 0.0103 N 4999737.50 4999737.50 Google, Inc. Google, Inc., 0.07% 38259KY72 Other Commercial Paper First Tier Security 2013-11-07 2013-11-07 N N N 7700000.00 7698981.89 0.0159 N 7698583.20 7698583.20 Google, Inc. Google, Inc., 0.08% 38259KW41 Other Commercial Paper First Tier Security 2013-09-04 2013-09-04 N N N 6000000.00 5999946.67 0.0124 N 5999941.80 5999941.80 Google, Inc. Google, Inc., 0.08% 38259KWJ8 Other Commercial Paper First Tier Security 2013-09-18 2013-09-18 N N N 4800000.00 4799808.00 0.0099 N 4799822.88 4799822.88 Govco LLC Govco LLC, 0.14% 38362VWS8 Asset Backed Commercial Paper First Tier Security 2013-09-26 2013-09-26 N N N 8000000.00 7999191.11 0.0165 N 7998638.40 7998638.40 Govco LLC Govco LLC, 0.15% 38362VWA7 Asset Backed Commercial Paper First Tier Security 2013-09-10 2013-09-10 N N N 5000000.00 4999791.67 0.0103 N 4999687.00 4999687.00 Govco LLC Govco LLC, 0.23% 38362VWJ8 Asset Backed Commercial Paper First Tier Security 2013-09-18 2013-09-18 N N N 5500000.00 5499367.50 0.0113 N 5499370.25 5499370.25 John Deere Capital Corp. John Deere Capital Corp., 0.06% 24422LW90 Financial Company Commercial Paper First Tier Security 2013-09-09 2013-09-09 N N N 8500000.00 8499872.50 0.0175 N 8499787.50 8499787.50 John Deere Capital Corp. John Deere Capital Corp., 0.07% 24422LWG4 Financial Company Commercial Paper First Tier Security 2013-09-16 2013-09-16 N N N 10000000.00 9999688.89 0.0206 N 9999575.00 9999575.00 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.12% 4820P2WJ0 Asset Backed Commercial Paper First Tier Security 2013-09-18 2013-09-18 N N N 7000000.00 6999580.00 0.0144 N 6999690.60 6999690.60 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.15% 4820P2WH4 Asset Backed Commercial Paper First Tier Security 2013-09-17 2013-09-17 N N N 11000000.00 10999220.83 0.0227 N 10999560.00 10999560.00 Kells Funding LLC Kells Funding LLC, 0.11% 48802RJK6 Asset Backed Commercial Paper First Tier Security 2013-09-11 2013-09-11 N N N 8500000.00 8499714.31 0.0175 N 8499699.95 8499699.95 Kells Funding LLC Kells Funding LLC, 0.12% 48802WSV1 Asset Backed Commercial Paper First Tier Security 2013-09-18 2013-09-18 N N N 10000000.00 9999000.00 0.0206 N 9999383.00 9999383.00 Old Line Funding LLC Old Line Funding LLC, 0.08% 67983TWC6 Asset Backed Commercial Paper First Tier Security 2013-09-12 2013-09-12 N N N 5000000.00 4999866.66 0.0103 N 4999928.00 4999928.00 Old Line Funding LLC Old Line Funding LLC, 0.17% 67983TWB8 Asset Backed Commercial Paper First Tier Security 2013-09-11 2013-09-11 N N N 7000000.00 6999636.39 0.0144 N 6999906.90 6999906.90 Roche Holdings, Inc. Roche Holdings, Inc., 0.05% 77119LWK1 Other Commercial Paper First Tier Security 2013-09-19 2013-09-19 N N N 5000000.00 4999868.05 0.0103 N 4999862.00 4999862.00 Roche Holdings, Inc. Roche Holdings, Inc., 0.09% 77119LWC9 Other Commercial Paper First Tier Security 2013-09-12 2013-09-12 N N N 5000000.00 4999850.00 0.0103 N 4999914.00 4999914.00 Roche Holdings, Inc. Roche Holdings, Inc., 0.10% 77119LWD7 Other Commercial Paper First Tier Security 2013-09-13 2013-09-13 N N N 8500000.00 8499693.06 0.0175 N 8499836.80 8499836.80 Royal Bank of Canada/New York Royal Bank of Canada/New York, 0.31% 78009NKT2 Other Instrument Floating Rate Note First Tier Security 2013-09-01 2014-01-30 N N N 15000000.00 15000000.00 0.0309 N 15008055.00 15008055.00 Sheffield Receivables Sheffield Receivables, 0.13% 82124LWK4 Asset Backed Commercial Paper First Tier Security 2013-09-19 2013-09-19 N N N 10000000.00 9999313.89 0.0206 N 9999289.00 9999289.00 Toronto Dominion Holdings USA, Inc. Toronto Dominion Holdings USA, Inc., 0.08% 89116EW66 Financial Company Commercial Paper First Tier Security 2013-09-06 2013-09-06 N N N 6500000.00 6499913.33 0.0134 N 6499949.30 6499949.30 Toronto Dominion Holdings USA, Inc. Toronto Dominion Holdings USA, Inc., 0.09% 89116EWW9 Financial Company Commercial Paper First Tier Security 2013-09-30 2013-09-30 N N N 6000000.00 5999550.00 0.0124 N 5999743.20 5999743.20 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.14% 89233GWT9 Other Commercial Paper First Tier Security 2013-09-27 2013-09-27 N N N 5500000.00 5499422.50 0.0113 N 5499624.35 5499624.35 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.269% 89236TAQ8 Other Instrument Floating Rate Note First Tier Security 2013-10-15 2014-07-14 N N N 13000000.00 13000000.00 0.0268 N 13000676.00 13000676.00 US Bank NA US Bank NA, 0.15% 90344W5K7 Asset Backed Commercial Paper First Tier Security 2013-09-30 2013-09-30 N N N 18500000.00 18500000.00 0.0381 N 18500000.00 18500000.00 US Treasury US Treasury, 0.125% 912828RK8 Treasury Debt First Tier Security 2013-09-30 2013-09-30 N N N 15000000.00 15000632.53 0.0309 N 15001170.00 15001170.00 US Treasury US Treasury, 0.25% 912828RN2 Treasury Debt First Tier Security 2013-10-31 2013-10-31 N N N 15000000.00 15003942.92 0.0309 N 15005280.00 15005280.00 US Treasury US Treasury, 0.25% 912828SG6 Treasury Debt First Tier Security 2014-02-28 2014-02-28 N N N 15000000.00 15013987.40 0.0309 N 15014355.00 15014355.00 US Treasury US Treasury, 0.50% 912828PU8 Treasury Debt First Tier Security 2013-11-15 2013-11-15 N N N 15000000.00 15013082.67 0.0309 N 15013470.00 15013470.00 US Treasury US Treasury, 0.75% 912828NY2 Treasury Debt First Tier Security 2013-09-15 2013-09-15 N N N 9000000.00 9002630.72 0.0185 N 9002106.00 9002106.00 US Treasury US Treasury, 0.75% 912828PL8 Treasury Debt First Tier Security 2013-12-15 2013-12-15 N N N 9000000.00 9017446.29 0.0186 N 9017577.00 9017577.00 US Treasury US Treasury, 1.75% 912828JZ4 Treasury Debt First Tier Security 2014-01-31 2014-01-31 N N N 10000000.00 10069257.54 0.0207 N 10068950.00 10068950.00 Wells Fargo Co. Wells Fargo Co., 0.15% 9497F0YC0 Financial Company Commercial Paper First Tier Security 2013-11-12 2013-11-12 N N N 6500000.00 6498022.92 0.0134 N 6497073.70 6497073.70 Wells Fargo Co. Wells Fargo Co., 0.16% 9497F0ZL9 Financial Company Commercial Paper First Tier Security 2013-12-20 2013-12-20 N N N 12000000.00 11994080.00 0.0247 N 11990480.40 11990480.40