N-MFP LIVE N 2011-05-31 0000773674 S000005965 1 N N 002-99222 AMERICAN CENTURY INVESTMENT MANAGEMENT, INC. 801-08174 PRICEWATERHOUSECOOPERS, LLP KANSAS CITY MO AMERICAN CENTURY SERVICES, LLC American Century Services, LLC 0000794265 084-01406 N N N Treasury 52 52 2651389576.66 278152005.89 69760078.66 2859781503.89 0.0008 1.0002 2011-05-31 1.0002 2011-05-31 C000016429 2500.00 2859781503.89 1.00 -18421539.82 68587949.37 87009489.19 0.0001 1.0002 2011-05-31 1.0002 2011-05-31 U.S. Treasury U.S. Treasury 0.008 912795W64 Treasury Debt First Tier Security 2011-06-02 2011-06-02 N N N 285000000.00 284999933.34 0.0997 N 284999715.00 284999715.00 U.S. Treasury U.S. Treasury 0.023 9127952U4 Treasury Debt First Tier Security 2011-06-09 2011-06-09 N N N 200000000.00 199998994.45 0.0699 N 199999400.00 199999400.00 U.S. Treasury U.S. Treasury 0.048 9127952V2 Treasury Debt First Tier Security 2011-06-16 2011-06-16 N N N 300000000.00 299994041.66 0.1049 N 299997900.00 299997900.00 U.S. Treasury U.S. Treasury 0.043 9127952W0 Treasury Debt First Tier Security 2011-06-23 2011-06-23 N N N 484000000.00 483987264.46 0.1692 N 483992740.00 483992740.00 U.S. Treasury U.S. Treasury 0.050 912795X22 Treasury Debt First Tier Security 2011-06-30 2011-06-30 N N N 135000000.00 134992230.41 0.0472 N 134996220.00 134996220.00 U.S. Treasury U.S. Treasury 1.125 912828LF5 Treasury Debt First Tier Security 2011-06-30 2011-06-30 N N N 332003000.00 332290906.12 0.1162 N 332327366.93 332327366.93 U.S. Treasury U.S. Treasury 5.125 912828FK1 Treasury Debt First Tier Security 2011-06-30 2011-06-30 N N N 7000000.00 7028063.08 0.0025 N 7028987.00 7028987.00 U.S. Treasury U.S. Treasury 0.071 9127952Z3 Treasury Debt First Tier Security 2011-07-14 2011-07-14 N N N 35000000.00 34997031.80 0.0122 N 34999510.00 34999510.00 U.S. Treasury U.S. Treasury 0.059 9127953A7 Treasury Debt First Tier Security 2011-07-21 2011-07-21 N N N 125000000.00 124989812.50 0.0437 N 124998250.00 124998250.00 U.S. Treasury U.S. Treasury 0.060 912795X63 Treasury Debt First Tier Security 2011-07-28 2011-07-28 N N N 70000000.00 69993350.00 0.0245 N 69998320.00 69998320.00 U.S. Treasury U.S. Treasury 1 912828LG3 Treasury Debt First Tier Security 2011-07-31 2011-07-31 N N N 50000000.00 50058410.08 0.0175 N 50084000.00 50084000.00 U.S. Treasury U.S. Treasury 4.625 912828FS4 Treasury Debt First Tier Security 2011-08-31 2011-08-31 N N N 163000000.00 164826715.44 0.0576 N 164846464.00 164846464.00 U.S. Treasury U.S. Treasury 1 912828LW8 Treasury Debt First Tier Security 2011-09-30 2011-09-30 N N N 80000000.00 80231654.85 0.0281 N 80246880.00 80246880.00 U.S. Treasury U.S. Treasury 4.5 912828FU9 Treasury Debt First Tier Security 2011-09-30 2011-09-30 N N N 50000000.00 50707432.62 0.0177 N 50734400.00 50734400.00 U.S. Treasury U.S. Treasury 4.625 912828FW5 Treasury Debt First Tier Security 2011-10-31 2011-10-31 N N N 25000000.00 25453626.71 0.0089 N 25469725.00 25469725.00 U.S. Treasury U.S. Treasury 1.75 912828JU5 Treasury Debt First Tier Security 2011-11-15 2011-11-15 N N N 15000000.00 15102335.33 0.0053 N 15113085.00 15113085.00 U.S. Treasury U.S. Treasury 0.75 912828MM9 Treasury Debt First Tier Security 2011-11-30 2011-11-30 N N N 4000000.00 4013096.53 0.0014 N 4013284.00 4013284.00 U.S. Treasury U.S. Treasury 4.5 912828GA2 Treasury Debt First Tier Security 2011-11-30 2011-11-30 N N N 60000000.00 61258351.40 0.0214 N 61314840.00 61314840.00 U.S. Treasury U.S. Treasury 1.125 912828KA7 Treasury Debt First Tier Security 2011-12-15 2011-12-15 N N N 105000000.00 105458690.98 0.0369 N 105570150.00 105570150.00 U.S. Treasury U.S. Treasury 1.125 912828KB5 Treasury Debt First Tier Security 2012-01-15 2012-01-15 N N N 50000000.00 50252415.42 0.0176 N 50310550.00 50310550.00 U.S. Treasury U.S. Treasury 0.875 912828MJ6 Treasury Debt First Tier Security 2012-01-31 2012-01-31 N N N 20000000.00 20086736.99 0.0070 N 20099220.00 20099220.00 U.S. Treasury U.S. Treasury 1.375 912828KC3 Treasury Debt First Tier Security 2012-02-15 2012-02-15 N N N 10000000.00 10071093.75 0.0035 N 10087110.00 10087110.00 U.S. Treasury U.S. Treasury 1 912828MU1 Treasury Debt First Tier Security 2012-03-31 2012-03-31 N N N 30000000.00 30204317.90 0.0106 N 30205110.00 30205110.00 U.S. Treasury U.S. Treasury 4.5 912828GQ7 Treasury Debt First Tier Security 2012-04-30 2012-04-30 N N N 10000000.00 10393070.84 0.0036 N 10391800.00 10391800.00