N-MFP LIVE N 2011-02-28 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 50 67 461994190.40 51736740.10 50855150.59 462875779.91 0.0023 1.0001 2011-02-28 1.0001 2011-02-28 C000000083 0.01 462875779.91 1.00 -1476117.40 17809898.59 19286015.99 0.0023 1.0001 2011-02-28 1.0001 2011-02-28 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.18% 02665KQ83 Other Commercial Paper First Tier Security 2011-03-08 2011-03-08 N N N 3200000.00 3199888.00 0.0069 N 3199869.76 3199869.76 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.353% 02666QH30 Other Instrument Floating Rate Note First Tier Security 2011-04-07 2011-10-07 N N N 10000000.00 10000000.00 0.0216 N 9994700.00 9994700.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.28% 04821UQB1 Asset Backed Commercial Paper First Tier Security 2011-03-11 2011-03-11 N N N 9700000.00 9699245.56 0.0211 N 9699303.54 9699303.54 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.26% 04821URC8 Asset Backed Commercial Paper First Tier Security 2011-04-12 2011-04-12 N N N 7800000.00 7797634.00 0.0168 N 7797493.86 7797493.86 Bank??of??America??Corp. Bank??of??America??Corp., 0.22% 0660P1Q12 Financial Company Commercial Paper First Tier Security 2011-03-01 2011-03-01 N N N 5700000.00 5700000.00 0.0123 N 5699973.21 5699973.21 Bank??of??America??Corp. Bank??of??America??Corp., 0.22% 0660P1Q38 Financial Company Commercial Paper First Tier Security 2011-03-03 2011-03-03 N N N 5500000.00 5499932.78 0.0119 N 5499921.90 5499921.90 Bank??of??America??Corp. Bank??of??America??Corp., 0.16% 0660P1Q46 Financial Company Commercial Paper First Tier Security 2011-03-04 2011-03-04 N N N 6300000.00 6299916.00 0.0136 N 6299880.93 6299880.93 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 5491053.33 0.0119 N 5494268.45 5494268.45 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 4991250.00 0.0108 N 4993439.50 4993439.50 Barclays??Bank??PLC Barclays??Bank??PLC, 0.653% 06740MKV4 Other Instrument Floating Rate Note Unrated Security 2011-04-19 2011-07-19 N N N 10000000.00 10000000.00 0.0216 N 10001890.00 10001890.00 Caterpillar??Financial??Services??Corp. Caterpillar??Financial??Services??Corp., 0.17% 14912EQ75 Other Commercial Paper First Tier Security 2011-03-07 2011-03-07 N N N 5000000.00 4999858.33 0.0108 N 4999815.50 4999815.50 Ciesco??LLC Ciesco??LLC, 0.40% 17177MV58 Asset Backed Commercial Paper First Tier Security 2011-08-05 2011-08-05 N N N 8500000.00 8485172.22 0.0183 N 8487689.45 8487689.45 Cisco??Systems,??Inc. Cisco??Systems,??Inc., 0.20% 17277BRL1 Other Commercial Paper First Tier Security 2011-04-20 2011-04-20 N N N 10400000.00 10397111.11 0.0225 N 10396346.48 10396346.48 Coca-Cola??Refreshments??USA,??Inc. Coca-Cola??Refreshments??USA,??Inc., 0.911% 191219BR4 Other Instrument Floating Rate Note First Tier Security 2011-05-06 2011-05-06 N N N 12295000.00 12309104.22 0.0266 N 12313663.81 12313663.81 John??Deere??Capital??Corp. John??Deere??Capital??Corp., 0.20% 24422MQ20 Other Commercial Paper First Tier Security 2011-03-02 2011-03-02 N N N 17500000.00 17499902.78 0.0378 N 17499814.50 17499814.50 eBay,??Inc. eBay,??Inc., 0.18% 27864BQA4 Other Commercial Paper First Tier Security 2011-03-10 2011-03-10 N N N 9750000.00 9749561.25 0.0211 N 9749491.05 9749491.05 eBay,??Inc. eBay,??Inc., 0.18% 27864BQP1 Other Commercial Paper First Tier Security 2011-03-23 2011-03-23 N N N 7500000.00 7499175.00 0.0162 N 7498864.50 7498864.50 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.23% 30603BQH9 Asset Backed Commercial Paper First Tier Security 2011-03-17 2011-03-17 N N N 6100000.00 6099376.44 0.0132 N 6099452.83 6099452.83 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.26% 30603BS20 Asset Backed Commercial Paper First Tier Security 2011-05-02 2011-05-02 N N N 11400000.00 11394895.33 0.0246 N 11395371.60 11395371.60 General??Electric??Capital??Corp. General??Electric??Capital??Corp., 0.22% 36959JRK1 Financial Company Commercial Paper First Tier Security 2011-04-19 2011-04-19 N N N 12300000.00 12296316.84 0.0266 N 12296805.69 12296805.69 General??Electric??Capital??Corp. General??Electric??Capital??Corp., 0.373% 36962G2R4 Other Instrument Floating Rate Note First Tier Security 2011-04-18 2011-04-18 N N N 5500000.00 5499494.16 0.0119 N 5500412.50 5500412.50 Google,??Inc. Google,??Inc., 0.23% 38259LT76 Other Commercial Paper First Tier Security 2011-06-07 2011-06-07 N N N 8000000.00 7994991.11 0.0173 N 7993862.40 7993862.40 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 8990657.50 0.0194 N 8990871.30 8990871.30 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.23% 4042F1QR3 Financial Company Commercial Paper First Tier Security 2011-03-25 2011-03-25 N N N 6100000.00 6099064.67 0.0132 N 6098970.93 6098970.93 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.23% 4042F1QW2 Financial Company Commercial Paper First Tier Security 2011-03-30 2011-03-30 N N N 11400000.00 11397887.83 0.0246 N 11397529.62 11397529.62 Mass??Mutual??Global??Funding??II Mass??Mutual??Global??Funding??II, 0.303% 57629WBJ8 Other Instrument Floating Rate Note First Tier Security 2011-04-21 2011-04-21 N N N 9900000.00 9900000.00 0.0214 N 9900594.00 9900594.00 Morgan??Stanley Morgan??Stanley, 0.553% 61746BCX2 Other Instrument Floating Rate Note First Tier Security 2011-04-09 2012-01-09 N N N 10000000.00 9991623.57 0.0216 N 9997520.00 9997520.00 New??York??Life??Global??Funding New??York??Life??Global??Funding, 0.26% 64952WAV5 Other Instrument Floating Rate Note First Tier Security 2011-03-01 2011-04-01 N N N 7400000.00 7400000.00 0.0161 N 7399415.40 7399415.40 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.23% 67983UQM8 Asset Backed Commercial Paper First Tier Security 2011-03-21 2011-03-21 N N N 9700000.00 9698760.56 0.0209 N 9699094.99 9699094.99 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.24% 67983UR54 Asset Backed Commercial Paper First Tier Security 2011-04-05 2011-04-05 N N N 7800000.00 7798180.00 0.0168 N 7798689.60 7798689.60 Rabobank??Nederland??NV??of??NY Rabobank??Nederland??NV??of??NY, 0.331% 74977MLA1 Other Instrument Floating Rate Note Unrated Security 2011-05-06 2011-08-08 N N N 15000000.00 15000000.00 0.0324 N 15001545.00 15001545.00 Royal??Bank??of??Canada Royal??Bank??of??Canada, 0.20% 78009BSP8 Financial Company Commercial Paper First Tier Security 2011-05-23 2011-05-23 N N N 9700000.00 9695527.22 0.0209 N 9695337.21 9695337.21 Royal??Bank??of??Canada Royal??Bank??of??Canada, 0.21% 78009BT10 Financial Company Commercial Paper First Tier Security 2011-06-01 2011-06-01 N N N 7500000.00 7495975.00 0.0162 N 7495892.25 7495892.25 Sheffield??Receivables Sheffield??Receivables, 0.22% 82124MQJ2 Asset Backed Commercial Paper First Tier Security 2011-03-18 2011-03-18 N N N 9000000.00 8999065.00 0.0194 N 8998897.50 8998897.50 Sheffield??Receivables Sheffield??Receivables, 0.23% 82124MQU7 Asset Backed Commercial Paper First Tier Security 2011-03-28 2011-03-28 N N N 8500000.00 8498533.75 0.0184 N 8498294.05 8498294.05 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.20% 86257KWB6 Asset Backed Commercial Paper First Tier Security 2011-03-14 2011-03-14 N N N 14000000.00 13998988.89 0.0302 N 13999081.60 13999081.60 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.16% 86257MZA1 Asset Backed Commercial Paper First Tier Security 2011-03-02 2011-03-02 N N N 5800000.00 5799974.22 0.0125 N 5799948.38 5799948.38 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.25% 89233HRJ5 Other Commercial Paper First Tier Security 2011-04-18 2011-04-18 N N N 7500000.00 7497500.00 0.0162 N 7497600.75 7497600.75 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.393% 89233P4J2 Other Instrument Floating Rate Note First Tier Security 2011-05-23 2011-08-22 N N N 10500000.00 10500000.00 0.0227 N 10506195.00 10506195.00 US??Treasury US??Treasury, 4.875% 912828FD7 Treasury Debt First Tier Security 2011-04-30 2011-04-30 N N N 30000000.00 30224355.92 0.0653 N 30229687.50 30229687.50 US??Treasury US??Treasury, 0.875% 912828KH2 Treasury Debt First Tier Security 2011-03-31 2011-03-31 N N N 30000000.00 30017080.03 0.0648 N 30021090.00 30021090.00 US??Treasury US??Treasury, 0.875% 912828KL3 Treasury Debt First Tier Security 2011-04-30 2011-04-30 N N N 30000000.00 30034966.17 0.0649 N 30038670.00 30038670.00 US??Treasury US??Treasury, 0.875% 912828KU3 Treasury Debt First Tier Security 2011-05-31 2011-05-31 N N N 30000000.00 30052171.61 0.0648 N 30057420.00 30057420.00