N-MFP LIVE N 2013-12-31 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 51 65 483159726.79 1185459.74 1163433.22 483181753.31 0.0015 1.0000 2013-12-31 1.0000 2013-12-31 C000000083 0.01 483181753.31 1.00 -9472320.27 25982699.40 35455019.67 0.0004 1.0000 2013-12-31 1.0000 2013-12-31 Alpine Securitization Alpine Securitization, 0.12% 02086MAE4 Asset Backed Commercial Paper First Tier Security 2014-01-14 2014-01-14 N N N 4800000.00 4799792.00 0.0099 N 4799798.40 4799798.40 Alpine Securitization Alpine Securitization, 0.12% 02086MAN4 Asset Backed Commercial Paper First Tier Security 2014-01-22 2014-01-22 N N N 7200000.00 7199496.00 0.0149 N 7199467.92 7199467.92 Alpine Securitization Alpine Securitization, 0.17% 02086MBA1 Asset Backed Commercial Paper First Tier Security 2014-02-10 2014-02-10 N N N 7000000.00 6998677.78 0.0145 N 6998844.30 6998844.30 American Honda Finance Corp. American Honda Finance Corp., 0.242% 02665WAD3 Other Instrument Floating Rate Note First Tier Security 2014-03-12 2014-12-05 N N N 13000000.00 13000000.00 0.0269 N 12999246.00 12999246.00 American Honda Finance Corp. American Honda Finance Corp., 0.368% 02666QL68 Other Instrument Floating Rate Note First Tier Security 2014-01-08 2014-04-08 N N N 5000000.00 5001794.36 0.0104 N 5001830.00 5001830.00 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.13% 04821UAP7 Asset Backed Commercial Paper First Tier Security 2014-01-23 2014-01-23 N N N 6000000.00 5999523.33 0.0124 N 5999532.60 5999532.60 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.14% 04821UAQ5 Asset Backed Commercial Paper First Tier Security 2014-01-24 2014-01-24 N N N 6900000.00 6899382.84 0.0143 N 6899434.20 6899434.20 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.16% 04821UAH5 Asset Backed Commercial Paper First Tier Security 2014-01-17 2014-01-17 N N N 6100000.00 6099566.22 0.0126 N 6099674.26 6099674.26 Bank of America NA Bank of America NA, 0.20% 06052WV83 Financial Company Commercial Paper First Tier Security 2014-02-19 2014-02-19 N N N 6000000.00 6000000.00 0.0124 N 5999999.40 5999999.40 Bank of America NA Bank of America NA, 1.656% 06051GEF2 Other Instrument Floating Rate Note First Tier Security 2014-01-30 2014-01-30 N N N 7500000.00 7507496.06 0.0155 N 7506315.00 7506315.00 Barclays Bank PLC Barclays Bank PLC, 1.284% 06740P3N4 Other Instrument Floating Rate Note First Tier Security 2014-01-13 2014-01-13 N N N 7970000.00 7972753.77 0.0165 N 7972239.57 7972239.57 BP Capital Markets PLC BP Capital Markets PLC, 0.843% 05565QBS6 Other Instrument Floating Rate Note First Tier Security 2014-03-11 2014-03-11 N N N 13110000.00 13124815.39 0.0272 N 13124761.86 13124761.86 Caterpillar Financial Services Corp. Caterpillar Financial Services Corp., 0.07% 14912EA64 Other Commercial Paper First Tier Security 2014-01-06 2014-01-06 N N N 8000000.00 7999922.22 0.0166 N 7999906.40 7999906.40 Cisco Systems, Inc. Cisco Systems, Inc., 0.493% 17275RAL6 Other Instrument Floating Rate Note First Tier Security 2014-03-14 2014-03-14 N N N 5006000.00 5008591.83 0.0104 N 5009479.17 5009479.17 Federal Home Loan Bank Federal Home Loan Bank, 0.05% 313385RG3 Government Agency Debt First Tier Security 2014-01-02 2014-01-02 N N N 8600000.00 8599988.06 0.0178 N 8600000.00 8600000.00 Federal Home Loan Bank Federal Home Loan Bank, 0.07% 313397UY5 Government Agency Debt First Tier Security 2014-03-31 2014-03-31 N N N 6300000.00 6298831.88 0.0130 N 6299540.10 6299540.10 Federal Home Loan Bank Federal Home Loan Bank, 0.09% 313385TJ5 Government Agency Debt First Tier Security 2014-02-21 2014-02-21 N N N 10000000.00 9998725.00 0.0207 N 9999720.00 9999720.00 Federal Home Loan Bank Federal Home Loan Bank, 0.10% 313385UT1 Government Agency Debt First Tier Security 2014-03-26 2014-03-26 N N N 7700000.00 7698203.33 0.0159 N 7699468.70 7699468.70 General Electric Capital General Electric Capital, 0.06% 36959JBU6 Financial Company Commercial Paper First Tier Security 2014-02-28 2014-02-28 N N N 4500000.00 4499565.00 0.0093 N 4499631.45 4499631.45 General Electric Capital General Electric Capital, 0.07% 36959JA37 Financial Company Commercial Paper First Tier Security 2014-01-03 2014-01-03 N N N 5400000.00 5399979.00 0.0112 N 5399982.18 5399982.18 General Electric Capital General Electric Capital, 0.12% 36959JC35 Financial Company Commercial Paper First Tier Security 2014-03-03 2014-03-03 N N N 9000000.00 8998170.00 0.0186 N 8999193.60 8999193.60 Google, Inc. Google, Inc., 0.05% 38259LA76 Other Commercial Paper First Tier Security 2014-01-07 2014-01-07 N N N 6500000.00 6499945.83 0.0135 N 6499974.65 6499974.65 Google, Inc. Google, Inc., 0.12% 38259LED9 Other Commercial Paper First Tier Security 2014-05-13 2014-05-13 N N N 5100000.00 5097756.00 0.0106 N 5098134.93 5098134.93 Govco LLC Govco LLC, 0.14% 38362WB34 Asset Backed Commercial Paper First Tier Security 2014-02-03 2014-02-03 N N N 8000000.00 7998973.33 0.0166 N 7998828.80 7998828.80 Govco LLC Govco LLC, 0.15% 38362WB67 Asset Backed Commercial Paper First Tier Security 2014-02-06 2014-02-06 N N N 8000000.00 7998800.00 0.0166 N 7998692.80 7998692.80 Govco LLC Govco LLC, 0.15% 38362WCJ8 Asset Backed Commercial Paper First Tier Security 2014-03-18 2014-03-18 N N N 3000000.00 2999050.00 0.0062 N 2998774.50 2998774.50 John Deere Bank SA John Deere Bank SA, 0.07% 24423JAN7 Other Commercial Paper First Tier Security 2014-01-22 2014-01-22 N N N 3000000.00 2999877.50 0.0062 N 2999869.80 2999869.80 John Deere Bank SA John Deere Bank SA, 0.09% 24423JA80 Other Commercial Paper First Tier Security 2014-01-08 2014-01-08 N N N 6000000.00 5999895.00 0.0124 N 5999906.40 5999906.40 John Deere Bank SA John Deere Bank SA, 0.10% 24423FAA3 Other Commercial Paper First Tier Security 2014-01-10 2014-01-10 N N N 10000000.00 9999750.00 0.0207 N 9999806.00 9999806.00 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.12% 4820P3BA0 Asset Backed Commercial Paper First Tier Security 2014-02-10 2014-02-10 N N N 10200000.00 10198640.00 0.0211 N 10198346.58 10198346.58 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.15% 4820P3CK7 Asset Backed Commercial Paper First Tier Security 2014-03-19 2014-03-19 N N N 5000000.00 4998395.84 0.0103 N 4998158.50 4998158.50 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.17% 4820P3CU5 Asset Backed Commercial Paper First Tier Security 2014-03-28 2014-03-28 N N N 2300000.00 2299065.94 0.0048 N 2299055.16 2299055.16 Liberty Street Funding LLC Liberty Street Funding LLC, 0.13% 53127UA67 Asset Backed Commercial Paper First Tier Security 2014-01-06 2014-01-06 N N N 8000000.00 7999855.56 0.0166 N 7999853.60 7999853.60 Liberty Street Funding LLC Liberty Street Funding LLC, 0.13% 53127UAA8 Asset Backed Commercial Paper First Tier Security 2014-01-10 2014-01-10 N N N 7200000.00 7199766.00 0.0149 N 7199763.84 7199763.84 Liberty Street Funding LLC Liberty Street Funding LLC, 0.17% 53127UBJ8 Asset Backed Commercial Paper First Tier Security 2014-02-18 2014-02-18 N N N 3800000.00 3799138.67 0.0079 N 3799105.10 3799105.10 Microsoft Corp. Microsoft Corp., 0.08% 59515NBC6 Other Commercial Paper First Tier Security 2014-02-12 2014-02-12 N N N 10000000.00 9999066.67 0.0207 N 9999534.00 9999534.00 Old Line Funding LLC Old Line Funding LLC, 0.13% 67983UAM5 Asset Backed Commercial Paper First Tier Security 2014-01-21 2014-01-21 N N N 4200000.00 4199696.67 0.0087 N 4199902.14 4199902.14 Old Line Funding LLC Old Line Funding LLC, 0.15% 67983UCK7 Asset Backed Commercial Paper First Tier Security 2014-03-19 2014-03-19 N N N 9000000.00 8997112.50 0.0186 N 8998674.30 8998674.30 Royal Bank of Canada/New York Royal Bank of Canada/New York, 0.31% 78009NKT2 Other Instrument Floating Rate Note First Tier Security 2014-01-02 2014-01-30 N N N 15000000.00 15000000.00 0.0310 N 15002925.00 15002925.00 Sheffield Receivables Corp. Sheffield Receivables Corp., 0.18% 82124MC40 Asset Backed Commercial Paper First Tier Security 2014-03-04 2014-03-04 N N N 5000000.00 4998450.00 0.0103 N 4998582.50 4998582.50 Sheffield Receivables Corp. Sheffield Receivables Corp., 0.18% 82124MC57 Asset Backed Commercial Paper First Tier Security 2014-03-05 2014-03-05 N N N 7000000.00 6997795.00 0.0145 N 6997971.40 6997971.40 Thunder Bay Funding LLC Thunder Bay Funding LLC, 0.12% 88602UAA8 Asset Backed Commercial Paper First Tier Security 2014-01-10 2014-01-10 N N N 11100000.00 11099667.00 0.0230 N 11099635.92 11099635.92 Thunder Bay Funding LLC Thunder Bay Funding LLC, 0.17% 88602UDU1 Asset Backed Commercial Paper First Tier Security 2014-04-28 2014-04-28 N N N 5000000.00 4997237.50 0.0103 N 4996553.00 4996553.00 Toronto Dominion Holdings USA, Inc. Toronto Dominion Holdings USA, Inc., 0.14% 89116FAF7 Financial Company Commercial Paper First Tier Security 2014-01-15 2014-01-15 N N N 20000000.00 19998911.11 0.0414 N 19999584.00 19999584.00 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.13% 89233HAM6 Other Commercial Paper First Tier Security 2014-01-21 2014-01-21 N N N 7000000.00 6999494.44 0.0145 N 6999714.40 6999714.40 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.244% 89236TAQ8 Other Commercial Paper First Tier Security 2014-01-14 2014-07-14 N N N 13000000.00 13000000.00 0.0269 N 13000416.00 13000416.00 US Bank NA US Bank NA, 0.15% 90347ENH1 Financial Company Commercial Paper First Tier Security 2014-01-31 2014-01-31 N N N 19000000.00 19000000.00 0.0393 N 19000000.00 19000000.00 US Treasury US Treasury, 0.25% 912828SG6 Treasury Debt First Tier Security 2014-02-28 2014-02-28 N N N 15000000.00 15004535.27 0.0311 N 15004395.00 15004395.00 US Treasury US Treasury, 0.25% 912828SL5 Treasury Debt First Tier Security 2014-03-31 2014-03-31 N N N 5000000.00 5002124.83 0.0104 N 5002245.00 5002245.00 US Treasury US Treasury, 1.25% 912828QC7 Treasury Debt First Tier Security 2014-04-15 2014-04-15 N N N 14000000.00 14046398.17 0.0291 N 14046214.00 14046214.00 US Treasury US Treasury, 1.75% 912828JZ4 Treasury Debt First Tier Security 2014-01-31 2014-01-31 N N N 10000000.00 10013943.64 0.0207 N 10013670.00 10013670.00 US Treasury US Treasury, 1.75% 912828KJ8 Treasury Debt First Tier Security 2014-03-31 2014-03-31 N N N 30000000.00 30122030.58 0.0623 N 30122460.00 30122460.00 US Treasury US Treasury, 1.875% 912828KN9 Treasury Debt First Tier Security 2014-04-30 2014-04-30 N N N 15000000.00 15086642.61 0.0312 N 15087015.00 15087015.00 US Treasury US Treasury, 2.625% 912828KY5 Treasury Debt First Tier Security 2014-06-30 2014-06-30 N N N 5000000.00 5062540.40 0.0105 N 5062400.00 5062400.00 US Treasury US Treasury, 4.25% 912828CT5 Treasury Debt First Tier Security 2014-08-15 2014-08-15 N N N 4800000.00 4923102.39 0.0102 N 4922812.80 4922812.80 US Treasury US Treasury, 4.75% 912828CJ7 Treasury Debt First Tier Security 2014-05-15 2014-05-15 N N N 9750000.00 9918048.44 0.0205 N 9916432.50 9916432.50 Wells Fargo Corp. Wells Fargo Corp., 0.14% 9497F1BD1 Financial Company Commercial Paper First Tier Security 2014-02-13 2014-02-13 N N N 7500000.00 7498745.83 0.0155 N 7498725.75 7498725.75