N-MFP LIVE N 2012-07-31 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 42 65 450492198.79 22879377.26 22042151.13 451329424.92 0.0010 1.0001 2012-07-31 1.0001 2012-07-31 C000000083 0.01 451329424.92 1.00 -4921667.97 19972789.32 24894457.29 0.0010 1.0001 2012-07-31 1.0001 2012-07-31 Alpine Securitization Corp. Alpine Securitization Corp., 0.12% 02086LH17 Asset Backed Commercial Paper First Tier Security 2012-08-01 2012-08-01 N N N 6900000.00 6900000.00 0.0153 N 6899965.50 6899965.50 Alpine Securitization Corp. Alpine Securitization Corp., 0.21% 02086LH82 Asset Backed Commercial Paper First Tier Security 2012-08-08 2012-08-08 N N N 10000000.00 9999591.67 0.0222 N 9999598.00 9999598.00 American Honda Finance Corp. American Honda Finance Corp., 0.712% 02666QJ87 Other Instrument Floating Rate Note First Tier Security 2012-09-26 2012-09-26 N N N 10000000.00 10000000.00 0.0222 N 10005160.00 10005160.00 American Honda Finance Corp. American Honda Finance Corp., 0.717% 02666QJ95 Other Instrument Floating Rate Note First Tier Security 2012-08-20 2012-11-20 N N N 6000000.00 6000000.00 0.0133 N 6003492.00 6003492.00 Bank of America NA Bank of America NA, 0.23% 06052WQA4 Financial Company Commercial Paper First Tier Security 2012-08-30 2012-08-30 N N N 6200000.00 6200000.00 0.0137 N 6199896.46 6199896.46 Bank of America NA Bank of America NA, 0.33% 06052WPD9 Financial Company Commercial Paper First Tier Security 2012-08-06 2012-08-06 N N N 10000000.00 10000000.00 0.0222 N 10000133.00 10000133.00 Bank of Nova Scotia Bank of Nova Scotia, 0.661% 06417DM85 Other Instrument Floating Rate Note First Tier Security 2012-10-05 2012-10-05 N N N 8400000.00 8400776.50 0.0186 N 8404200.00 8404200.00 BP Capital Markets PLC BP Capital Markets PLC, 0.666% 05568WAB8 Financial Company Commercial Paper First Tier Security 2012-08-08 2013-02-08 N N N 10000000.00 10000000.00 0.0222 N 10009160.00 10009160.00 BP Capital Markets PLC BP Capital Markets PLC, 0.667% 05568WAC6 Financial Company Commercial Paper First Tier Security 2012-08-07 2013-05-07 N N N 7000000.00 7000000.00 0.0155 N 7009345.00 7009345.00 Caterpillar Financial Services Corp. Caterpillar Financial Services Corp., 0.15% 14912DHT9 Other Commercial Paper First Tier Security 2012-08-27 2012-08-27 N N N 3000000.00 2999675.00 0.0066 N 2999550.00 2999550.00 Caterpillar Financial Services Corp. Caterpillar Financial Services Corp., 0.15% 14912DHU6 Other Commercial Paper First Tier Security 2012-08-28 2012-08-28 N N N 15000000.00 14998312.50 0.0332 N 14997666.00 14997666.00 Chariot Funding LLC Chariot Funding LLC, 0.17% 15963THD4 Asset Backed Commercial Paper First Tier Security 2012-08-13 2012-08-13 N N N 8000000.00 7999546.67 0.0177 N 7999566.40 7999566.40 Chariot Funding LLC Chariot Funding LLC, 0.18% 15963TH36 Asset Backed Commercial Paper First Tier Security 2012-08-03 2012-08-03 N N N 5000000.00 4999950.00 0.0111 N 4999937.50 4999937.50 Chariot Funding LLC Chariot Funding LLC, 0.18% 15963TH77 Asset Backed Commercial Paper First Tier Security 2012-08-07 2012-08-07 N N N 4500000.00 4499865.00 0.0100 N 4499868.60 4499868.60 Deere & Co. Deere & Co., 0.14% 2441W0HP6 Other Commercial Paper First Tier Security 2012-08-23 2012-08-23 N N N 7000000.00 6999401.11 0.0155 N 6999105.40 6999105.40 Fcar Owner Trust I Fcar Owner Trust I, 0.31% 3024A0LL7 Asset Backed Commercial Paper First Tier Security 2012-11-20 2012-11-20 N N N 5000000.00 4995220.83 0.0111 N 4994571.00 4994571.00 Fcar Owner Trust I Fcar Owner Trust I, 0.33% 3024A0ME2 Asset Backed Commercial Paper First Tier Security 2012-12-14 2012-12-14 N N N 6000000.00 5992575.00 0.0133 N 5990752.20 5990752.20 Federal Home Loan Bank Federal Home Loan Bank, 0.08% 313384B57 Government Agency Debt First Tier Security 2012-08-10 2012-08-10 N N N 5500000.00 5499883.13 0.0122 N 5499972.50 5499972.50 Federal Home Loan Bank Federal Home Loan Bank, 0.08% 313384E62 Government Agency Debt First Tier Security 2012-09-04 2012-09-04 N N N 2000000.00 1999848.89 0.0044 N 1999868.00 1999868.00 Federal Home Loan Bank Federal Home Loan Bank, 0.09% 313384D30 Government Agency Debt First Tier Security 2012-08-24 2012-08-24 N N N 18174000.00 18172955.00 0.0403 N 18173763.73 18173763.73 Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp., 0.08% 313396A94 Government Agency Debt First Tier Security 2012-08-06 2012-08-06 N N N 8000000.00 7999911.11 0.0177 N 7999976.00 7999976.00 Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp., 0.09% 313396A94 Government Agency Debt First Tier Security 2012-08-06 2012-08-06 N N N 3900000.00 3899951.25 0.0086 N 3899988.30 3899988.30 Federal National Mortgage Association Federal National Mortgage Association, 0.11% 313588E68 Government Agency Debt First Tier Security 2012-09-04 2012-09-04 N N N 8000000.00 7999168.89 0.0177 N 7999472.00 7999472.00 General Electric Capital Corp. General Electric Capital Corp., 0.37% 36959HN29 Financial Company Commercial Paper First Tier Security 2013-01-02 2013-01-02 N N N 10000000.00 9984172.22 0.0221 N 9987169.00 9987169.00 General Electric Co. General Electric Co., 0.18% 36960LJR7 Other Commercial Paper First Tier Security 2012-09-25 2012-09-25 N N N 7500000.00 7497937.50 0.0166 N 7498542.00 7498542.00 The Goldman Sachs Group, Inc. The Goldman Sachs Group, Inc., 3.625% 38141EA41 Other Instrument Fixed Rate Note First Tier Security 2012-08-01 2012-08-01 N N N 8000000.00 8000598.62 0.0177 N 8000080.00 8000080.00 The Goldman Sachs Group, Inc. The Goldman Sachs Group, Inc., 5.45% 38144LAC4 Other Instrument Fixed Rate Note Second Tier Security 2012-11-01 2012-11-01 N N N 9500000.00 9612908.44 0.0213 N 9611672.50 9611672.50 Google, Inc. Google, Inc., 0.13% 38259KHA4 Other Commercial Paper First Tier Security 2012-08-10 2012-08-10 N N N 9000000.00 8999707.50 0.0199 N 8999675.10 8999675.10 Google, Inc. Google, Inc., 0.13% 38259KHV8 Other Commercial Paper First Tier Security 2012-08-29 2012-08-29 N N N 8500000.00 8499140.56 0.0188 N 8499110.05 8499110.05 Govco LLC Govco LLC, 0.42% 38362VHG1 Asset Backed Commercial Paper First Tier Security 2012-08-16 2012-08-16 N N N 15100000.00 15097357.50 0.0335 N 15098591.17 15098591.17 Old Line Funding LLC Old Line Funding LLC, 0.18% 67983THT6 Asset Backed Commercial Paper First Tier Security 2012-08-27 2012-08-27 N N N 7500000.00 7499025.00 0.0166 N 7499252.25 7499252.25 Old Line Funding LLC Old Line Funding LLC, 0.19% 67983TJA5 Asset Backed Commercial Paper First Tier Security 2012-09-10 2012-09-10 N N N 5000000.00 4998944.44 0.0111 N 4999328.00 4999328.00 Old Line Funding LLC Old Line Funding LLC, 0.23% 67983TJH0 Asset Backed Commercial Paper First Tier Security 2012-09-17 2012-09-17 N N N 5000000.00 4998498.61 0.0111 N 4999293.50 4999293.50 Rabobank Financial Corp. Rabobank Financial Corp., 0.31% 74977KKV0 Financial Company Commercial Paper First Tier Security 2012-10-29 2012-10-29 N N N 6500000.00 6495018.47 0.0144 N 6494962.50 6494962.50 Roche Holdings, Inc. Roche Holdings, Inc., 0.12% 77119LH93 Other Commercial Paper First Tier Security 2012-08-09 2012-08-09 N N N 5000000.00 4999866.67 0.0111 N 4999871.50 4999871.50 Roche Holdings, Inc. Roche Holdings, Inc., 0.13% 77119LHE2 Other Commercial Paper First Tier Security 2012-08-14 2012-08-14 N N N 5000000.00 4999765.28 0.0111 N 4999789.00 4999789.00 Roche Holdings, Inc. Roche Holdings, Inc., 0.13% 77119LHF9 Other Commercial Paper First Tier Security 2012-08-15 2012-08-15 N N N 7500000.00 7499620.83 0.0166 N 7499656.50 7499656.50 Sheffield Receivables Sheffield Receivables, 0.20% 82124LHH8 Asset Backed Commercial Paper First Tier Security 2012-08-17 2012-08-17 N N N 6000000.00 5999466.67 0.0133 N 5999461.80 5999461.80 Sheffield Receivables Sheffield Receivables, 0.25% 82124LJ52 Asset Backed Commercial Paper First Tier Security 2012-09-05 2012-09-05 N N N 11100000.00 11097302.08 0.0246 N 11097646.80 11097646.80 Straight-A Funding LLC Straight-A Funding LLC, 0.15% 86257YHB3 Asset Backed Commercial Paper First Tier Security 2012-08-22 2012-08-22 N N N 10000000.00 9999125.00 0.0222 N 9999131.00 9999131.00 Straight-A Funding LLC Straight-A Funding LLC, 0.18% 86257G2Y8 Asset Backed Commercial Paper First Tier Security 2012-09-21 2012-09-21 N N N 7500000.00 7498087.50 0.0166 N 7497783.00 7497783.00 Toronto Dominion Holdings USA, Inc. Toronto Dominion Holdings USA, Inc., 0.15% 89116EHP1 Financial Company Commercial Paper First Tier Security 2012-08-23 2012-08-23 N N N 6500000.00 6499404.17 0.0144 N 6499498.85 6499498.85 Toronto Dominion Holdings USA, Inc. Toronto Dominion Holdings USA, Inc., 0.15% 89116EHQ9 Financial Company Commercial Paper First Tier Security 2012-08-24 2012-08-24 N N N 11000000.00 10998945.83 0.0244 N 10999068.30 10999068.30 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.55% 89233GNQ5 Other Commercial Paper First Tier Security 2013-01-24 2013-01-24 N N N 7500000.00 7479833.33 0.0166 N 7487573.25 7487573.25 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.666% 89233P5Y8 Other Instrument Floating Rate Note First Tier Security 2012-08-01 2013-02-01 N N N 10000000.00 10000000.00 0.0222 N 10011300.00 10011300.00 US Treasury US Treasury, 0.375% 912828PH7 Treasury Debt First Tier Security 2012-08-31 2012-08-31 N N N 10000000.00 10001916.53 0.0222 N 10003520.00 10003520.00 US Treasury US Treasury, 0.375% 912828PD6 Treasury Debt First Tier Security 2012-10-31 2012-10-31 N N N 5000000.00 5002690.59 0.0111 N 5003710.00 5003710.00 US Treasury US Treasury, 1.125% 912828MB3 Treasury Debt First Tier Security 2012-12-15 2012-12-15 N N N 15000000.00 15054097.40 0.0334 N 15056250.00 15056250.00 US Treasury US Treasury, 1.375% 912828LR9 Treasury Debt First Tier Security 2012-10-15 2012-10-15 N N N 8000000.00 8020206.30 0.0178 N 8021568.00 8021568.00 US Treasury US Treasury, 1.75% 912828LH1 Treasury Debt First Tier Security 2012-08-15 2012-08-15 N N N 20000000.00 20013321.74 0.0443 N 20014840.00 20014840.00 US Treasury US Treasury, 3.375% 912828HK9 Treasury Debt First Tier Security 2012-11-30 2012-11-30 N N N 14000000.00 14148586.61 0.0313 N 14150934.00 14150934.00 US Treasury US Treasury, 3.875% 912828HG8 Treasury Debt First Tier Security 2012-10-31 2012-10-31 N N N 10000000.00 10092987.81 0.0224 N 10094140.00 10094140.00 Wachovia Corp. Wachovia Corp., 2.236% 92976WBK1 Other Instrument Floating Rate Note First Tier Security 2012-08-01 2013-05-01 N N N 15645000.00 15847033.04 0.0351 N 15853626.08 15853626.08