N-MFP LIVE N 2010-12-30 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. N N Y Prime 49 74 476580766.06 941811.92 1231466.60 476291111.38 0.0025 1.0000 2010-12-30 1.0000 2010-12-30 C000000083 0.01 476291111.38 1.00 -16753886.82 18752722.29 35506609.11 0.0025 1.0000 2010-12-30 1.0000 2010-12-30 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.21% 02665KNM5 Other Commercial Paper First Tier Security 2011-01-21 2011-01-21 N N N 8500000.00 8499008.33 0.0178 N 8498760.70 8498760.70 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.339% 02666QH30 Other Instrument Floating Rate Note First Tier Security 2011-01-07 2011-10-07 N N N 10000000.00 10000000.00 0.0210 N 9984600.00 9984600.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.26% 04821UNB4 Asset Backed Commercial Paper First Tier Security 2011-01-11 2011-01-11 N N N 8800000.00 8799364.45 0.0185 N 8799274.00 8799274.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.25% 04821UNJ7 Asset Backed Commercial Paper First Tier Security 2011-01-18 2011-01-18 N N N 9700000.00 9698854.86 0.0204 N 9698690.50 9698690.50 Barclays??US??Funding??LLC Barclays??US??Funding??LLC, 0.48% 06737JU11 Financial Company Commercial Paper First Tier Security 2011-07-01 2011-07-01 N N N 5500000.00 5486726.67 0.0115 N 5488544.05 5488544.05 Barclays??US??Funding??LLC Barclays??US??Funding??LLC, 0.45% 06737JUK9 Financial Company Commercial Paper First Tier Security 2011-07-19 2011-07-19 N N N 5000000.00 4987562.50 0.0105 N 4988055.50 4988055.50 Barclays??Bank??PLC Barclays??Bank??PLC, 0.439% 06740MKV4 Other Instrument Floating Rate Note Unrated Security 2011-01-19 2011-07-19 N N N 10000000.00 10000000.00 0.0210 N 9999760.00 9999760.00 Caterpillar??Financial??Services??Corp. Caterpillar??Financial??Services??Corp., 0.16% 14912ENK9 Other Commercial Paper First Tier Security 2011-01-19 2011-01-19 N N N 5180000.00 5179585.60 0.0109 N 5179426.05 5179426.05 Caterpillar??Financial??Services??Corp. Caterpillar??Financial??Services??Corp., 0.20% 14912EPR2 Other Commercial Paper First Tier Security 2011-02-25 2011-02-25 N N N 12500000.00 12496180.55 0.0262 N 12495041.25 12495041.25 Ciesco??LLC Ciesco??LLC, 0.27% 17177MPN6 Asset Backed Commercial Paper First Tier Security 2011-02-22 2011-02-22 N N N 9500000.00 9496295.00 0.0199 N 9496489.75 9496489.75 Coca-Cola Refreshments USA, Inc. Coca-Cola Refreshments USA, Inc., 0.886% 191219BR4 Other Instrument Floating Rate Note First Tier Security 2011-02-07 2011-05-06 N N N 12295000.00 12321261.73 0.0259 N 12320696.55 12320696.55 John??Deere??Capital??Corp. John??Deere??Capital??Corp., 0.989% 24422EQN2 Other Instrument Floating Rate Note First Tier Security 2011-01-18 2011-01-18 N N N 5500000.00 5501710.26 0.0116 N 5501947.00 5501947.00 John??Deere??Credit,??Ltd. John??Deere??Credit,??Ltd., 0.21% 24423NN61 Other Commercial Paper First Tier Security 2011-01-06 2011-01-06 N N N 9800000.00 9799714.17 0.0206 N 9799657.00 9799657.00 eBay,??Inc. eBay,??Inc., 0.18% 27864BNA7 Other Commercial Paper First Tier Security 2011-01-10 2011-01-10 N N N 9000000.00 8999595.00 0.0189 N 8999430.30 8999430.30 eBay,??Inc. eBay,??Inc., 0.18% 27864BNL3 Other Commercial Paper First Tier Security 2011-01-20 2011-01-20 N N N 9500000.00 9499097.50 0.0199 N 9498690.90 9498690.90 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.25% 30603BPB3 Asset Backed Commercial Paper First Tier Security 2011-02-11 2011-02-11 N N N 11500000.00 11496725.69 0.0241 N 11497182.50 11497182.50 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.25% 30603BPP2 Asset Backed Commercial Paper First Tier Security 2011-02-23 2011-02-23 N N N 5700000.00 5697902.08 0.0120 N 5698067.70 5698067.70 General??Electric??Capital??Corp. General??Electric??Capital??Corp., 0.20% 36959JPG2 Financial Company Commercial Paper First Tier Security 2011-02-16 2011-02-16 N N N 12500000.00 12496805.55 0.0262 N 12496882.50 12496882.50 General??Electric??Capital??Corp. General??Electric??Capital??Corp., 0.359% 36962G2R4 Other Instrument Floating Rate Note First Tier Security 2011-01-18 2011-04-18 N N N 5500000.00 5498889.58 0.0115 N 5501039.50 5501039.50 Google,??Inc. Google,??Inc., 0.19% 38259LPF2 Other Commercial Paper First Tier Security 2011-02-15 2011-02-15 N N N 10000000.00 9997625.00 0.0210 N 9996665.00 9996665.00 Google,??Inc. Google,??Inc., 0.23% 38259LT76 Other Commercial Paper First Tier Security 2011-06-07 2011-06-07 N N N 8000000.00 7991975.56 0.0168 N 7986622.40 7986622.40 Govco??LLC Govco??LLC, 0.37% 38362WTA9 Asset Backed Commercial Paper First Tier Security 2011-06-10 2011-06-10 N N N 9000000.00 8985200.00 0.0189 N 8981726.40 8981726.40 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.17% 4042F1N70 Financial Company Commercial Paper First Tier Security 2011-01-07 2011-01-07 N N N 10000000.00 9999716.67 0.0210 N 9999572.00 9999572.00 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.21% 4042F1NS4 Financial Company Commercial Paper First Tier Security 2011-01-26 2011-01-26 N N N 6200000.00 6199095.83 0.0130 N 6198853.62 6198853.62 Mass??Mutual??Global??Funding??II Mass??Mutual??Global??Funding??II, 0.289% 57629WBJ8 Other Instrument Floating Rate Note First Tier Security 2011-01-21 2011-04-21 N N N 9900000.00 9900000.00 0.0208 N 9901465.20 9901465.20 Morgan??Stanley Morgan??Stanley, 0.539% 617446YT0 Other Instrument Floating Rate Note First Tier Security 2011-01-18 2011-01-18 N N N 14800000.00 14799489.41 0.0311 N 14801420.80 14801420.80 New??York??Life??Global??Funding New??York??Life??Global??Funding, 0.258% 64952WAV5 Other Instrument Floating Rate Note First Tier Security 2011-01-04 2011-04-01 N N N 7400000.00 7400000.00 0.0155 N 7398231.40 7398231.40 Nissan??Auto??Lease??Trust Nissan??Auto??Lease??Trust, 0.561% 65476CAA9 Other Instrument Asset Backed Security First Tier Security 2011-06-15 2011-06-15 N N N 6223.40 6223.40 0.0001 N 6224.06 6224.06 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.23% 67983UN58 Asset Backed Commercial Paper First Tier Security 2011-01-05 2011-01-05 N N N 4018000.00 4017897.32 0.0084 N 4017949.77 4017949.77 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.24% 67983UNR0 Asset Backed Commercial Paper First Tier Security 2011-01-25 2011-01-25 N N N 11234000.00 11232202.56 0.0236 N 11232993.43 11232993.43 Rabobank??Nederland??NV??of??NY Rabobank??Nederland??NV??of??NY, 0.306% 74977MLA1 Other Instrument Floating Rate Note Unrated Security 2011-02-07 2011-08-08 N N N 15000000.00 15000000.00 0.0315 N 14999730.00 14999730.00 Royal??Bank??of??Canada Royal??Bank??of??Canada, 0.20% 78009BP14 Financial Company Commercial Paper First Tier Security 2011-02-01 2011-02-01 N N N 9500000.00 9498363.89 0.0199 N 9498784.00 9498784.00 Royal??Bank??of??Canada Royal??Bank??of??Canada, 0.20% 78009BPN6 Financial Company Commercial Paper First Tier Security 2011-02-22 2011-02-22 N N N 10000000.00 9997111.11 0.0210 N 9997335.00 9997335.00 Sheffield??Receivables Sheffield??Receivables, 0.24% 82124MNQ9 Asset Backed Commercial Paper First Tier Security 2011-01-24 2011-01-24 N N N 9500000.00 9498543.33 0.0199 N 9498290.00 9498290.00 Sheffield??Receivables Sheffield??Receivables, 0.25% 82124MPJ3 Asset Backed Commercial Paper First Tier Security 2011-02-18 2011-02-18 N N N 9000000.00 8997000.00 0.0189 N 8996533.20 8996533.20 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.24% 86257KTX2 Asset Backed Commercial Paper First Tier Security 2011-02-14 2011-02-14 N N N 14400000.00 14395776.00 0.0302 N 14396220.00 14396220.00 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.21% 86257MXL9 Asset Backed Commercial Paper First Tier Security 2011-01-18 2011-01-18 N N N 4000000.00 3999603.33 0.0084 N 3999650.00 3999650.00 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.27% 89233HND2 Other Commercial Paper First Tier Security 2011-01-13 2011-01-13 N N N 10000000.00 9999100.00 0.0210 N 9999565.00 9999565.00 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.364% 89233P4J2 Other Instrument Floating Rate Note First Tier Security 2011-02-22 2011-08-22 N N N 10500000.00 10500000.00 0.0220 N 10497249.00 10497249.00 US??Treasury US??Treasury, 0.875% 912828JY7 Treasury Debt First Tier Security 2011-01-31 2011-01-31 N N N 30000000.00 30017106.63 0.0630 N 30019920.00 30019920.00 US??Treasury US??Treasury, 0.875% 912828KE9 Treasury Debt First Tier Security 2011-02-28 2011-02-28 N N N 30000000.00 30035124.06 0.0631 N 30036330.00 30036330.00 US??Treasury US??Treasury, 0.875% 912828KH2 Treasury Debt First Tier Security 2011-03-31 2011-03-31 N N N 30000000.00 30049579.04 0.0631 N 30053910.00 30053910.00 US??Treasury US??Treasury, 0.875% 912828KL3 Treasury Debt First Tier Security 2011-04-30 2011-04-30 N N N 30000000.00 30068775.73 0.0631 N 30072660.00 30072660.00 Wells??Fargo??&??Co. Wells??Fargo??&??Co., 0.05% 9497F1N30 Financial Company Commercial Paper First Tier Security 2011-01-03 2011-01-03 N N N 8040000.00 8039977.67 0.0169 N 8039872.97 8039872.97