N-MFP LIVE N 2014-06-30 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. None N N Y Prime 51 88 449237269.56 39639666.86 39389260.48 449487675.94 0.0013 1.0000 2014-06-30 1.0000 2014-06-30 C000000083 0.01 449487675.94 1.00 -6262456.09 16625939.30 22888395.39 0.0010 1.0000 2014-06-30 1.0000 2014-06-30 Alpine Securitization Alpine Securitization, 0.17% 02086MGH1 Asset Backed Commercial Paper First Tier Security 2014-07-17 2014-07-17 N N N 10000000.00 9999244.44 0.0222 N 9999386.00 9999386.00 Alpine Securitization Alpine Securitization, 0.18% 02086MGM0 Asset Backed Commercial Paper First Tier Security 2014-07-21 2014-07-21 N N N 3000000.00 2999700.00 0.0067 N 2999772.60 2999772.60 Alpine Securitization Alpine Securitization, 0.22% 02086MJH8 Asset Backed Commercial Paper First Tier Security 2014-09-17 2014-09-17 N N N 5000000.00 4997616.67 0.0111 N 4998102.00 4998102.00 American Honda Finance Corp. American Honda Finance Corp., 0.10% 02665KGN1 Other Commercial Paper First Tier Security 2014-07-22 2014-07-22 N N N 5000000.00 4999708.33 0.0111 N 4999725.00 4999725.00 American Honda Finance Corp. American Honda Finance Corp., 0.230% 02665WAD3 Other Instrument Floating Rate Note First Tier Security 2014-09-12 2014-12-05 N N N 13000000.00 13000000.00 0.0289 N 8000000.00 8000000.00 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.15% 04821UG71 Asset Backed Commercial Paper First Tier Security 2014-07-07 2014-07-07 N N N 7000000.00 6999825.00 0.0156 N 6999850.20 6999850.20 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.16% 04821UH54 Asset Backed Commercial Paper First Tier Security 2014-08-05 2014-08-05 N N N 3000000.00 2999533.33 0.0067 N 2999568.00 2999568.00 Atlantic Asset Securitization LLC Atlantic Asset Securitization LLC, 0.19% 04821UHL9 Asset Backed Commercial Paper First Tier Security 2014-08-20 2014-08-20 N N N 8000000.00 7997888.89 0.0178 N 7998254.40 7998254.40 Bank Of America NA Bank Of America NA, 0.17% 06053HAP0 Financial Company Commercial Paper First Tier Security 2014-08-04 2014-08-04 N N N 7000000.00 7000000.00 0.0156 N 7000543.90 7000543.90 Bank Of America NA Bank Of America NA, 0.18% 06052W7C1 Financial Company Commercial Paper First Tier Security 2014-07-01 2014-07-01 N N N 6000000.00 6000000.00 0.0133 N 6000003.60 6000003.60 Bank Of America NA Bank Of America NA, 0.19% 06053HDE2 Financial Company Commercial Paper First Tier Security 2014-09-24 2014-09-24 N N N 5000000.00 5000000.00 0.0111 N 5000716.50 5000716.50 Caterpillar Financial Caterpillar Financial, 0.10% 14912EGE1 Other Commercial Paper First Tier Security 2014-07-14 2014-07-14 N N N 2200000.00 2199920.55 0.0049 N 2199923.00 2199923.00 Ebay, Inc. Ebay, Inc., 0.09% 27864BHK2 Other Commercial Paper First Tier Security 2014-08-19 2014-08-19 N N N 9200000.00 9198873.00 0.0205 N 9198722.12 9198722.12 Ebay, Inc. Ebay, Inc., 0.10% 27864BHC0 Other Commercial Paper First Tier Security 2014-08-12 2014-08-12 N N N 8200000.00 8199043.33 0.0182 N 8199148.02 8199148.02 Federal Home Loan Bank Disc Corp. Federal Home Loan Bank Disc Corp., 0.05% 313385ZK5 Government Agency Debt First Tier Security 2014-07-16 2014-07-16 N N N 5300000.00 5299889.58 0.0118 N 5299957.60 5299957.60 Federal Home Loan Bank Disc Corp. Federal Home Loan Bank Disc Corp., 0.05% 313385A89 Government Agency Debt First Tier Security 2014-08-06 2014-08-06 N N N 7000000.00 6999650.00 0.0156 N 6999860.00 6999860.00 Federal Home Loan Bank Disc Corp. Federal Home Loan Bank Disc Corp., 0.06% 313385ZS8 Government Agency Debt First Tier Security 2014-07-23 2014-07-23 N N N 3600000.00 3599857.00 0.0080 N 3599956.80 3599956.80 Federal Home Loan Bank Disc Corp. Federal Home Loan Bank Disc Corp., 0.06% 313385B21 Government Agency Debt First Tier Security 2014-08-08 2014-08-08 N N N 6700000.00 6699540.31 0.0149 N 6699859.30 6699859.30 Federal Home Loan Bank Disc Corp. Federal Home Loan Bank Disc Corp., 0.07% 313385B96 Government Agency Debt First Tier Security 2014-08-15 2014-08-15 N N N 7700000.00 7699326.25 0.0171 N 7699807.50 7699807.50 General Electric Capital General Electric Capital, 0.10% 36959JG23 Financial Company Commercial Paper First Tier Security 2014-07-02 2014-07-02 N N N 5000000.00 4999986.11 0.0111 N 4999989.00 4999989.00 General Electric Capital General Electric Capital, 0.14% 36959JK36 Financial Company Commercial Paper First Tier Security 2014-10-03 2014-10-03 N N N 12900000.00 12895284.33 0.0287 N 12896153.22 12896153.22 Govco LLC Govco LLC, 0.16% 38362WHB0 Asset Backed Commercial Paper First Tier Security 2014-08-11 2014-08-11 N N N 18000000.00 17996720.00 0.0400 N 17996472.00 17996472.00 John Deere Canada Ulc John Deere Canada Ulc, 0.08% 24423JGF8 Other Commercial Paper First Tier Security 2014-07-15 2014-07-15 N N N 4400000.00 4399863.11 0.0098 N 4399835.00 4399835.00 John Deere Canada Ulc John Deere Canada Ulc, 0.09% 24423JGG6 Other Commercial Paper First Tier Security 2014-07-16 2014-07-16 N N N 5000000.00 4999812.50 0.0111 N 4999800.00 4999800.00 Jupiter Securitization Co. LLC Jupiter Securitization Co. LLC, 0.10% 4820P3GU1 Asset Backed Commercial Paper First Tier Security 2014-07-28 2014-07-28 N N N 2900000.00 2899782.50 0.0065 N 2899693.76 2899693.76 Liberty Street Funding LLC Liberty Street Funding LLC, 0.15% 53127UGB0 Asset Backed Commercial Paper First Tier Security 2014-07-11 2014-07-11 N N N 7500000.00 7499687.50 0.0167 N 7499679.00 7499679.00 Liberty Street Funding LLC Liberty Street Funding LLC, 0.17% 53127UH45 Asset Backed Commercial Paper First Tier Security 2014-08-04 2014-08-04 N N N 5500000.00 5499116.94 0.0122 N 5499128.25 5499128.25 Liberty Street Funding LLC Liberty Street Funding LLC, 0.17% 53127UJK7 Asset Backed Commercial Paper First Tier Security 2014-09-19 2014-09-19 N N N 5000000.00 4998111.11 0.0111 N 4997817.50 4997817.50 Microsoft Corp. Microsoft Corp., 0.09% 59515NH63 Other Commercial Paper First Tier Security 2014-08-06 2014-08-06 N N N 4400000.00 4399604.00 0.0098 N 4399778.24 4399778.24 Microsoft Corp. Microsoft Corp., 0.09% 59515NHD8 Other Commercial Paper First Tier Security 2014-08-13 2014-08-13 N N N 5000000.00 4999462.50 0.0111 N 4999639.50 4999639.50 Microsoft Corp. Microsoft Corp., 0.09% 59515NHT3 Other Commercial Paper First Tier Security 2014-08-27 2014-08-27 N N N 5000000.00 4999287.50 0.0111 N 4999307.00 4999307.00 Old Line Funding LLC Old Line Funding LLC, 0.16% 67983UK10 Asset Backed Commercial Paper First Tier Security 2014-10-01 2014-10-01 N N N 10000000.00 9995911.11 0.0222 N 9997107.00 9997107.00 Rabobank Nederland of NY Rabobank Nederland of NY, 0.251% 21684BLK8 Other Instrument Floating Rate Note First Tier Security 2014-07-14 2015-01-13 N N N 10000000.00 10000000.00 0.0222 N 13000000.00 13000000.00 Rabobank Nederland of NY Rabobank Nederland of NY, 0.277% 21684BQC1 Other Instrument Floating Rate Note First Tier Security 2014-08-26 2015-02-25 N N N 8000000.00 8000000.00 0.0178 N 10000000.00 10000000.00 Roche Holdings, Inc. Roche Holdings, Inc., 0.07% 77119MH75 Other Commercial Paper First Tier Security 2014-08-07 2014-08-07 N N N 10000000.00 9999280.56 0.0222 N 9998828.00 9998828.00 Royal Bank of Canada NY Royal Bank of Canada NY, 0.27% 78009NQL3 Other Instrument Floating Rate Note First Tier Security 2014-07-01 2015-02-04 N N N 15000000.00 15000000.00 0.0334 N 15000000.00 15000000.00 Sheffield Receivables Corp. Sheffield Receivables Corp., 0.14% 82124MGE4 Asset Backed Commercial Paper First Tier Security 2014-07-14 2014-07-14 N N N 8000000.00 7999595.56 0.0178 N 7999601.60 7999601.60 Sheffield Receivables Corp. Sheffield Receivables Corp., 0.18% 82124MHK9 Asset Backed Commercial Paper First Tier Security 2014-08-19 2014-08-19 N N N 10000000.00 9997550.00 0.0222 N 9997875.00 9997875.00 Thunder Bay Funding LLC Thunder Bay Funding LLC, 0.16% 88602UJR2 Asset Backed Commercial Paper First Tier Security 2014-09-25 2014-09-25 N N N 5000000.00 4998088.89 0.0111 N 4997474.50 4997474.50 Thunder Bay Funding LLC Thunder Bay Funding LLC, 0.17% 88602UK66 Asset Backed Commercial Paper First Tier Security 2014-10-06 2014-10-06 N N N 5000000.00 4997709.72 0.0111 N 4997146.00 4997146.00 Toronto Dominion Holdings USA Toronto Dominion Holdings USA, 0.14% 89116FGE4 Financial Company Commercial Paper First Tier Security 2014-07-14 2014-07-14 N N N 3000000.00 2999848.33 0.0067 N 2999952.90 2999952.90 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.13% 89233HG99 Other Commercial Paper First Tier Security 2014-07-09 2014-07-09 N N N 5000000.00 4999855.56 0.0111 N 4999937.50 4999937.50 Toyota Motor Credit Corp. Toyota Motor Credit Corp., 0.227% 89236TAQ8 Other Commercial Paper First Tier Security 2014-07-14 2014-07-14 N N N 13000000.00 13000000.00 0.0289 N 13000000.00 13000000.00 US Bank NA US Bank NA, 0.15% 90347E5D0 Financial Company Commercial Paper First Tier Security 2014-07-18 2014-07-18 N N N 18000000.00 18000000.00 0.0400 N 18000315.00 18000315.00 US Treasury US Treasury, 0.070% 912828WK2 Treasury Debt First Tier Security 2014-07-01 2016-01-31 N N N 15000000.00 14995292.15 0.0334 N 14995292.15 14995292.15 US Treasury US Treasury, 0.125% 912828TF7 Treasury Debt First Tier Security 2014-07-31 2014-07-31 N N N 15000000.00 15000865.02 0.0334 N 15000865.02 15000865.02 US Treasury US Treasury, 0.25% 912828TL4 Treasury Debt First Tier Security 2014-08-31 2014-08-31 N N N 10000000.00 10003136.45 0.0223 N 10003136.45 10003136.45 US Treasury US Treasury, 0.25% 912828RG7 Treasury Debt First Tier Security 2014-09-15 2014-09-15 N N N 5000000.00 5002070.68 0.0111 N 5002070.68 5002070.68 US Treasury US Treasury, 0.25% 912828TZ3 Treasury Debt First Tier Security 2014-11-30 2014-11-30 N N N 30000000.00 30022265.63 0.0668 N 30022265.63 30022265.63 US Treasury US Treasury, 0.375% 912828RQ5 Treasury Debt First Tier Security 2014-11-15 2014-11-15 N N N 15000000.00 15017918.24 0.0334 N 15017918.24 15017918.24 US Treasury US Treasury, 2.125% 912828LZ1 Treasury Debt First Tier Security 2014-11-30 2014-11-30 N N N 5800000.00 5849774.15 0.0130 N 5849774.15 5849774.15 US Treasury US Treasury, 2.375% 912828LQ1 Treasury Debt First Tier Security 2014-09-30 2014-09-30 N N N 10000000.00 10057916.32 0.0224 N 10057916.32 10057916.32 US Treasury US Treasury, 4.25% 912828CT5 Treasury Debt First Tier Security 2014-08-15 2014-08-15 N N N 4800000.00 4825037.41 0.0107 N 4825037.41 4825037.41 Wells Fargo & Co. Wells Fargo & Co., 0.12% 9497F1H11 Financial Company Commercial Paper First Tier Security 2014-08-01 2014-08-01 N N N 3600000.00 3599628.00 0.0080 N 3599578.80 3599578.80 Wells Fargo & Co. Wells Fargo & Co., 0.12% 9497F1HJ2 Financial Company Commercial Paper First Tier Security 2014-08-18 2014-08-18 N N N 3000000.00 2999520.00 0.0067 N 2999418.90 2999418.90 Wells Fargo & Co. Wells Fargo & Co., 0.14% 9497F1GA2 Financial Company Commercial Paper First Tier Security 2014-07-10 2014-07-10 N N N 9400000.00 9399671.00 0.0209 N 9399770.64 9399770.64