N-MFP LIVE N 2010-11-30 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 47 73 492135780.01 10159270.07 9215726.17 493079323.91 0.0026 1.0001 2010-11-30 1.0001 2010-11-30 C000000083 0.01 493079323.91 1.00 -14007906.27 14964097.63 28972003.90 0.0026 1.0001 2010-11-30 1.0001 2010-11-30 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.26% 02665KMG9 Other Commercial Paper N First Tier Security 2010-12-16 2010-12-16 N N N 6500000.00 6499295.83 0.0132 N 6499269.40 6499269.40 American??Honda??Finance??Corp. American??Honda??Finance??Corp., 0.339% 02666QH30 Other Instrument Floating Rate Note N First Tier Security 2011-01-07 2011-10-07 N N N 10000000.00 10000000.00 0.0203 N 9986200.00 9986200.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.24% 04821UM82 Asset Backed Commercial Paper N First Tier Security 2010-12-08 2010-12-08 N N N 4400000.00 4399794.67 0.0089 N 4399736.00 4399736.00 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.24% 04821UMM1 Asset Backed Commercial Paper N First Tier Security 2010-12-21 2010-12-21 N N N 6300000.00 6299160.00 0.0128 N 6299007.75 6299007.75 Atlantic??Asset??Securitization??LLC Atlantic??Asset??Securitization??LLC, 0.26% 04821UNB4 Asset Backed Commercial Paper N First Tier Security 2011-01-11 2011-01-11 N N N 8800000.00 8797394.22 0.0178 N 8797228.00 8797228.00 Bank??of??America??Corp. Bank??of??America??Corp., 0.21% 0660P1M32 Financial Company Commercial Paper N First Tier Security 2010-12-03 2010-12-03 N N N 6000000.00 5999930.00 0.0122 N 5999905.20 5999905.20 Bank??of??America??Corp. Bank??of??America??Corp., 0.26% 0660P1MW8 Financial Company Commercial Paper N First Tier Security 2010-12-30 2010-12-30 N N N 10500000.00 10497800.83 0.0213 N 10498337.85 10498337.85 Barclays??US??Funding??LLC Barclays??US??Funding??LLC, 0.48% 06737JU11 Financial Company Commercial Paper N First Tier Security 2011-07-01 2011-07-01 N N N 5500000.00 5484453.34 0.0111 N 5484868.40 5484868.40 Barclays??US??Funding??LLC Barclays??US??Funding??LLC, 0.45% 06737JUK9 Financial Company Commercial Paper N First Tier Security 2011-07-19 2011-07-19 N N N 5000000.00 4985625.00 0.0101 N 4984119.00 4984119.00 Barclays??Bank??PLC Barclays??Bank??PLC, 0.439% 06740MKV4 Other Instrument Floating Rate Note N Unrated Security 2011-01-19 2011-07-19 N N N 10000000.00 10000000.00 0.0203 N 10001580.00 10001580.00 Caterpillar??Financial Services Corp. Caterpillar??Financial Services Corp., 0.18% 14912EMD6 Other Commercial Paper N First Tier Security 2010-12-13 2010-12-13 N N N 5000000.00 4999700.00 0.0101 N 4999584.50 4999584.50 Ciesco??LLC Ciesco??LLC, 0.27% 17177MPN6 Asset Backed Commercial Paper N First Tier Security 2011-02-22 2011-02-22 N N N 9500000.00 9494086.25 0.0193 N 9493793.65 9493793.65 Coca-Cola??Enterprises,??Inc. Coca-Cola??Enterprises,??Inc., 0.886% 191219BR4 Other Instrument Floating Rate Note N First Tier Security 2011-02-07 2011-05-06 N N N 12295000.00 12327568.92 0.0250 N 12328995.68 12328995.68 John??Deere??Capital??Corp. John??Deere??Capital??Corp., 0.989% 24422EQN2 Other Instrument Floating Rate Note N First Tier Security 2011-01-18 2011-01-18 N N N 5500000.00 5504655.01 0.0112 N 5505065.50 5505065.50 John??Deere??Capital??Corp. John??Deere??Capital??Corp., 0.19% 24422MM99 Other Commercial Paper N First Tier Security 2010-12-09 2010-12-09 N N N 5500000.00 5499767.78 0.0112 N 5499683.75 5499683.75 John??Deere??Capital??Corp. John??Deere??Capital??Corp., 0.20% 24422MM99 Other Commercial Paper N First Tier Security 2010-12-09 2010-12-09 N N N 5000000.00 4999777.78 0.0101 N 4999712.50 4999712.50 eBay,??Inc. eBay,??Inc., 0.18% 27864BMA8 Other Commercial Paper N First Tier Security 2010-12-10 2010-12-10 N N N 10000000.00 9999550.00 0.0203 N 9999306.00 9999306.00 eBay,??Inc. eBay,??Inc., 0.18% 27864BMG5 Other Commercial Paper N First Tier Security 2010-12-16 2010-12-16 N N N 9500000.00 9499287.50 0.0193 N 9498932.20 9498932.20 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.22% 30603BM75 Asset Backed Commercial Paper N First Tier Security 2010-12-07 2010-12-07 N N N 10000000.00 9999633.33 0.0203 N 9999572.00 9999572.00 Falcon??Asset??Securitization??Co.??LLC Falcon??Asset??Securitization??Co.??LLC, 0.23% 30603BML4 Asset Backed Commercial Paper N First Tier Security 2010-12-20 2010-12-20 N N N 9500000.00 9498846.80 0.0193 N 9498839.10 9498839.10 General??Electric??Co. General??Electric??Co., 0.21% 36960MMT7 Other Commercial Paper N First Tier Security 2010-12-27 2010-12-27 N N N 6900000.00 6898953.50 0.0140 N 6899016.75 6899016.75 General??Electric??Co. General??Electric??Co., 0.21% 36960MMU4 Other Commercial Paper N First Tier Security 2010-12-28 2010-12-28 N N N 7100000.00 7098881.75 0.0144 N 7098950.62 7098950.62 General??Electric??Capital??Corp. General??Electric??Capital??Corp., 0.359% 36962G2R4 Other Instrument Floating Rate Note N First Tier Security 2011-01-18 2011-04-18 N N N 5500000.00 5498576.89 0.0112 N 5497767.00 5497767.00 Google,??Inc. Google,??Inc., 0.19% 38259LPF2 Other Commercial Paper N First Tier Security 2011-02-15 2011-02-15 N N N 10000000.00 9995988.89 0.0203 N 9993861.00 9993861.00 Govco??LLC Govco??LLC, 0.23% 38362WME8 Asset Backed Commercial Paper N First Tier Security 2010-12-14 2010-12-14 N N N 10000000.00 9999169.44 0.0203 N 9998872.00 9998872.00 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.22% 4042F1MN6 Financial Company Commercial Paper N First Tier Security 2010-12-22 2010-12-22 N N N 7300000.00 7299063.17 0.0148 N 7298791.12 7298791.12 HSBC??Finance??Corp. HSBC??Finance??Corp., 0.22% 4042F1MV8 Financial Company Commercial Paper N First Tier Security 2010-12-29 2010-12-29 N N N 12200000.00 12197912.44 0.0247 N 12197258.66 12197258.66 Mass??Mutual??Global??Funding??II Mass??Mutual??Global??Funding??II, 0.289% 57629WBJ8 Other Instrument Floating Rate Note N First Tier Security 2011-01-21 2011-04-21 N N N 9900000.00 9900000.00 0.0201 N 9902029.50 9902029.50 Morgan??Stanley Morgan??Stanley, 0.539% 617446YT0 Other Instrument Floating Rate Note N First Tier Security 2011-01-18 2011-01-18 N N N 14800000.00 14798610.43 0.0300 N 14803004.40 14803004.40 New??York??Life??Global??Funding New??York??Life??Global??Funding, 0.254% 64952WAV5 Other Instrument Floating Rate Note N First Tier Security 2010-12-01 2011-04-01 N N N 7400000.00 7400000.00 0.0150 N 7398372.00 7398372.00 Nissan??Auto??Lease??Trust Nissan??Auto??Lease??Trust, 0.561% 65476CAA9 Other Instrument Asset Backed Security N First Tier Security 2011-06-15 2011-06-15 N N N 574413.16 574413.16 0.0012 N 574467.05 574467.05 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.23% 67983UMF7 Asset Backed Commercial Paper N First Tier Security 2010-12-15 2010-12-15 N N N 13700000.00 13698774.61 0.0278 N 13698914.96 13698914.96 Old??Line??Funding??LLC Old??Line??Funding??LLC, 0.23% 67983UMP5 Asset Backed Commercial Paper N First Tier Security 2010-12-23 2010-12-23 N N N 5800000.00 5799184.78 0.0118 N 5799295.88 5799295.88 Rabobank??Nederland??NV??of??NY Rabobank??Nederland??NV??of??NY, 0.306% 74977MLA1 Other Instrument Floating Rate Note N Unrated Security 2011-02-07 2011-08-08 N N N 15000000.00 15000000.00 0.0304 N 15001185.00 15001185.00 Ranger??Funding??Co.??LLC Ranger??Funding??Co.??LLC, 0.24% 7528A3M10 Asset Backed Commercial Paper N First Tier Security 2010-12-01 2010-12-01 N N N 10000000.00 10000000.00 0.0203 N 9999936.00 9999936.00 Ranger??Funding??Co.??LLC Ranger??Funding??Co.??LLC, 0.24% 7528A3MF9 Asset Backed Commercial Paper N First Tier Security 2010-12-15 2010-12-15 N N N 9500000.00 9499113.33 0.0193 N 9499089.90 9499089.90 Royal??Bank??of??Canada Royal??Bank??of??Canada, 0.20% 78009BPN6 Financial Company Commercial Paper N First Tier Security 2011-02-22 2011-02-22 N N N 10000000.00 9995388.88 0.0203 N 9995100.00 9995100.00 Sheffield??Receivables Sheffield??Receivables, 0.22% 82124MMH0 Asset Backed Commercial Paper N First Tier Security 2010-12-17 2010-12-17 N N N 10000000.00 9999022.22 0.0203 N 9998725.00 9998725.00 Sheffield??Receivables Sheffield??Receivables, 0.24% 82124MNQ9 Asset Backed Commercial Paper N First Tier Security 2011-01-24 2011-01-24 N N N 9500000.00 9496580.00 0.0193 N 9495979.60 9495979.60 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.25% 86257JSQ1 Asset Backed Commercial Paper N First Tier Security 2010-12-13 2010-12-13 N N N 5000000.00 4999583.33 0.0101 N 4999661.50 4999661.50 Straight-A??Funding??LLC Straight-A??Funding??LLC, 0.22% 86257KSS4 Asset Backed Commercial Paper N First Tier Security 2010-12-02 2010-12-02 N N N 15000000.00 14999908.33 0.0304 N 14999850.00 14999850.00 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.27% 89233HND2 Other Commercial Paper N First Tier Security 2011-01-13 2011-01-13 N N N 10000000.00 9996775.00 0.0203 N 9997067.00 9997067.00 Toyota??Motor??Credit??Corp. Toyota??Motor??Credit??Corp., 0.364% 89233P4J2 Other Instrument Floating Rate Note N First Tier Security 2011-02-22 2011-08-22 N N N 10500000.00 10500000.00 0.0213 N 10497333.00 10497333.00 US??Treasury US??Treasury, 4.375% 912828EQ9 Treasury Debt N First Tier Security 2010-12-15 2010-12-15 N N N 30000000.00 30049116.13 0.0609 N 30051570.00 30051570.00 US??Treasury US??Treasury, 0.875% 912828JY7 Treasury Debt N First Tier Security 2011-01-31 2011-01-31 N N N 30000000.00 30034210.42 0.0609 N 30038670.00 30038670.00 US??Treasury US??Treasury, 0.875% 912828KE9 Treasury Debt N First Tier Security 2011-02-28 2011-02-28 N N N 30000000.00 30053575.57 0.0610 N 30055080.00 30055080.00 US??Treasury US??Treasury, 0.875% 912828KH2 Treasury Debt N First Tier Security 2011-03-31 2011-03-31 N N N 30000000.00 30066650.48 0.0610 N 30070320.00 30070320.00 Wells??Fargo??&??Co. Wells??Fargo??&??Co., 0.125% 9497F1M15 Financial Company Commercial Paper N First Tier Security 2010-12-01 2010-12-01 N N N 1500000.00 1500000.00 0.0030 N 1499990.85 1499990.85