N-MFP LIVE N 2011-03-31 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 56 56 2627468709.80 293977967.92 8228096.60 2913218581.12 0.0011 1.0001 2011-03-31 1.0001 2011-03-31 C000016429 2500.00 2913218581.12 1.00 -16690129.17 88069025.61 104759154.78 0.0001 1.0001 2011-03-31 1.0001 2011-03-31 U.S. Treasury U.S. Treasury 0.076 912795VD0 Treasury Debt First Tier Security 2011-04-07 2011-04-07 N N N 380000000.00 379995216.69 0.1304 N 379997720.00 379997720.00 U.S. Treasury U.S. Treasury 0.030 9127952L4 Treasury Debt First Tier Security 2011-04-14 2011-04-14 N N N 335000000.00 334996370.81 0.1150 N 334996315.00 334996315.00 U.S. Treasury U.S. Treasury 0.102 9127956Q9 Treasury Debt First Tier Security 2011-04-15 2011-04-15 N N N 80000000.00 79996826.67 0.0275 N 79999040.00 79999040.00 U.S. Treasury U.S. Treasury 0.054 9127952M2 Treasury Debt First Tier Security 2011-04-21 2011-04-21 N N N 330000000.00 329990083.34 0.1133 N 329992740.00 329992740.00 U.S. Treasury U.S. Treasury 0.048 9127952N0 Treasury Debt First Tier Security 2011-04-28 2011-04-28 N N N 250000000.00 249991000.00 0.0858 N 249992000.00 249992000.00 U.S. Treasury U.S. Treasury 0.875 912828KL3 Treasury Debt First Tier Security 2011-04-30 2011-04-30 N N N 25000000.00 25013378.30 0.0086 N 25018550.00 25018550.00 U.S. Treasury U.S. Treasury 0.041 912795VE8 Treasury Debt First Tier Security 2011-05-05 2011-05-05 N N N 325000000.00 324987415.28 0.1116 N 324988625.00 324988625.00 U.S. Treasury U.S. Treasury 0.151 9127952S9 Treasury Debt First Tier Security 2011-05-26 2011-05-26 N N N 82000000.00 81981144.17 0.0281 N 81994342.00 81994342.00 U.S. Treasury U.S. Treasury 0.875 912828KU3 Treasury Debt First Tier Security 2011-05-31 2011-05-31 N N N 100000000.00 100115800.00 0.0344 N 100140600.00 100140600.00 U.S. Treasury U.S. Treasury 0.111 9127952U4 Treasury Debt First Tier Security 2011-06-09 2011-06-09 N N N 25000000.00 24994681.25 0.0086 N 24997125.00 24997125.00 U.S. Treasury U.S. Treasury 0.091 9127952V2 Treasury Debt First Tier Security 2011-06-16 2011-06-16 N N N 100000000.00 99980788.88 0.0343 N 99985900.00 99985900.00 U.S. Treasury U.S. Treasury 0.095 9127952W0 Treasury Debt First Tier Security 2011-06-23 2011-06-23 N N N 65000000.00 64985763.21 0.0223 N 64988430.00 64988430.00 U.S. Treasury U.S. Treasury 0.096 912795X22 Treasury Debt First Tier Security 2011-06-30 2011-06-30 N N N 70000000.00 69983200.00 0.0240 N 69986000.00 69986000.00 U.S. Treasury U.S. Treasury 1.125 912828LF5 Treasury Debt First Tier Security 2011-06-30 2011-06-30 N N N 50000000.00 50123764.34 0.0172 N 50130850.00 50130850.00 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 7087092.31 0.0024 N 7087500.00 7087500.00 U.S. Treasury U.S. Treasury 1 912828LG3 Treasury Debt First Tier Security 2011-07-31 2011-07-31 N N N 50000000.00 50117793.65 0.0172 N 50150400.00 50150400.00 U.S. Treasury U.S. Treasury 4.625 912828FS4 Treasury Debt First Tier Security 2011-08-31 2011-08-31 N N N 33000000.00 33600314.93 0.0115 N 33611028.00 33611028.00 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 51064072.20 0.0175 N 51076200.00 51076200.00 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 25635674.28 0.0088 N 25642575.00 25642575.00 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 15139715.30 0.0052 N 15145320.00 15145320.00 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 61680106.55 0.0212 N 61710960.00 61710960.00 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 105600722.19 0.0362 N 105664440.00 105664440.00 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 50319947.61 0.0173 N 50339850.00 50339850.00 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 10087837.84 0.0035 N 10095710.00 10095710.00