N-MFP LIVE N 2011-01-31 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. N N Y Prime 46 71 463905665.88 38758653.84 38312422.41 464351897.31 0.0023 1.0000 2011-01-31 1.0000 2011-01-31 C000000083 0.01 464351897.31 1.00 -11939214.06 17892429.58 29831643.64 0.0023 1.0000 2011-01-31 1.0000 2011-01-31 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.18% 02665KP76 Other Commercial Paper First Tier Security 2011-02-07 2011-02-07 N N N 7500000.00 7499775.00 0.0162 N 7499679.00 7499679.00 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 0.0215 N 9994800.00 9994800.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.25% 04821UP89 Asset Backed Commercial Paper First Tier Security 2011-02-08 2011-02-08 N N N 8300000.00 8299596.53 0.0179 N 8299520.26 8299520.26 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 9697133.11 0.0209 N 9697141.41 9697141.41 Bank??of??America??Corp. Bank??of??America??Corp., 0.22% 0660P1P21 Financial Company Commercial Paper First Tier Security 2011-02-02 2011-02-02 N N N 5500000.00 5499966.39 0.0118 N 5499948.30 5499948.30 Bank??of??America??Corp. Bank??of??America??Corp., 0.20% 0660P1PH8 Financial Company Commercial Paper First Tier Security 2011-02-17 2011-02-17 N N N 6300000.00 6299440.00 0.0136 N 6299494.11 6299494.11 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 5699024.66 0.0123 N 5699219.67 5699219.67 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 5489000.00 0.0118 N 5491441.45 5491441.45 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 4989500.00 0.0107 N 4990869.50 4990869.50 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 0.0215 N 10002190.00 10002190.00 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 12498333.33 0.0269 N 12498351.25 12498351.25 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 9498503.75 0.0205 N 9498897.05 9498897.05 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 12314953.09 0.0265 N 12316749.86 12316749.86 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 17497180.56 0.0377 N 17497229.75 17497229.75 eBay,??Inc. eBay,??Inc., 0.18% 27864BPA5 Other Commercial Paper First Tier Security 2011-02-10 2011-02-10 N N N 8500000.00 8499617.50 0.0183 N 8499471.30 8499471.30 eBay,??Inc. eBay,??Inc., 0.18% 27864BPP2 Other Commercial Paper First Tier Security 2011-02-23 2011-02-23 N N N 7500000.00 7499175.00 0.0162 N 7498816.50 7498816.50 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 11499201.39 0.0248 N 11499280.10 11499280.10 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 5699129.17 0.0123 N 5699235.06 5699235.06 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 12498958.33 0.0269 N 12499000.00 12499000.00 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 5499205.25 0.0118 N 5500643.50 5500643.50 Google,??Inc. Google,??Inc., 0.19% 38259LPF2 Other Commercial Paper First Tier Security 2011-02-15 2011-02-15 N N N 10000000.00 9999261.11 0.0215 N 9999167.00 9999167.00 Google,??Inc. Google,??Inc., 0.23% 38259LT76 Other Commercial Paper First Tier Security 2011-06-07 2011-06-07 N N N 8000000.00 7993560.00 0.0172 N 7990432.80 7990432.80 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 8988067.50 0.0194 N 8986674.60 8986674.60 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.23% 4042F1PQ6 Financial Company Commercial Paper First Tier Security 2011-02-24 2011-02-24 N N N 6100000.00 6099103.64 0.0131 N 6098983.13 6098983.13 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.23% 4042F1PU7 Financial Company Commercial Paper First Tier Security 2011-02-28 2011-02-28 N N N 11400000.00 11398033.50 0.0246 N 11397667.56 11397667.56 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 0.0213 N 9900445.50 9900445.50 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 9990869.29 0.0215 N 9992960.00 9992960.00 New??York??Life??Global??Funding New??York??Life??Global??Funding, 0.261% 64952WAV5 Other Instrument Floating Rate Note First Tier Security 2011-02-01 2011-04-01 N N N 7400000.00 7400000.00 0.0159 N 7398690.20 7398690.20 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.23% 67983UP49 Asset Backed Commercial Paper First Tier Security 2011-02-04 2011-02-04 N N N 6700000.00 6699871.58 0.0144 N 6699873.37 6699873.37 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.22% 67983UP98 Asset Backed Commercial Paper First Tier Security 2011-02-09 2011-02-09 N N N 1300000.00 1299936.44 0.0028 N 1299943.84 1299943.84 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 0.0323 N 14996295.00 14996295.00 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 9500000.00 0.0205 N 9499962.95 9499962.95 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 9998833.33 0.0215 N 9999144.00 9999144.00 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 8998937.50 0.0194 N 8998830.00 8998830.00 Sheffield??Receivables Sheffield??Receivables, 0.23% 82124MPR5 Asset Backed Commercial Paper First Tier Security 2011-02-25 2011-02-25 N N N 8500000.00 8498696.67 0.0183 N 8498464.90 8498464.90 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.20% 86257CP97 Asset Backed Commercial Paper First Tier Security 2011-02-14 2011-02-14 N N N 3100000.00 3099776.11 0.0067 N 3099796.64 3099796.64 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 14398752.00 0.0311 N 14399055.36 14399055.36 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 7496041.67 0.0161 N 7495653.00 7495653.00 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 0.0226 N 10499034.00 10499034.00 US??Treasury US??Treasury, 0.875% 912828KE9 Treasury Debt First Tier Security 2011-02-28 2011-02-28 N N N 30000000.00 30016670.19 0.0646 N 30018750.00 30018750.00 US??Treasury US??Treasury, 0.875% 912828KH2 Treasury Debt First Tier Security 2011-03-31 2011-03-31 N N N 30000000.00 30032504.62 0.0647 N 30037500.00 30037500.00 US??Treasury US??Treasury, 0.875% 912828KL3 Treasury Debt First Tier Security 2011-04-30 2011-04-30 N N N 30000000.00 30051012.62 0.0647 N 30055080.00 30055080.00 US??Treasury US??Treasury, 0.875% 912828KU3 Treasury Debt First Tier Security 2011-05-31 2011-05-31 N N N 30000000.00 30068045.05 0.0647 N 30066810.00 30066810.00