N-MFP LIVE N 2011-01-31 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 53 53 2660148291.53 309128554.90 6300987.89 2962975858.54 0.0017 1.0001 2011-01-31 1.0001 2011-01-31 C000016429 2500.00 2962975858.54 1.00 -32587954.37 90955251.80 123543206.17 0.0001 1.0001 2011-01-31 1.0001 2011-01-31 U.S. Treasury U.S. Treasury 0.136 912795Y21 Treasury Debt First Tier Security 2011-02-03 2011-02-03 N N N 645000000.00 644995459.75 0.2177 N 644996130.00 644996130.00 U.S. Treasury U.S. Treasury 0.148 912795V40 Treasury Debt First Tier Security 2011-02-10 2011-02-10 N N N 185000000.00 184993177.50 0.0624 N 184994265.00 184994265.00 U.S. Treasury U.S. Treasury 0.192 912820GC5 Treasury Debt First Tier Security 2011-02-15 2011-02-15 N N N 50000000.00 49996310.81 0.0169 N 49996900.00 49996900.00 U.S. Treasury U.S. Treasury 5 9128276T4 Treasury Debt First Tier Security 2011-02-15 2011-02-15 N N N 235000000.00 235433588.32 0.0795 N 235458955.00 235458955.00 U.S. Treasury U.S. Treasury 0.154 9127952B6 Treasury Debt First Tier Security 2011-02-17 2011-02-17 N N N 255000000.00 254982595.58 0.0861 N 254985210.00 254985210.00 U.S. Treasury U.S. Treasury 0.127 9127952C4 Treasury Debt First Tier Security 2011-02-24 2011-02-24 N N N 68000000.00 67994482.56 0.0229 N 67994356.00 67994356.00 U.S. Treasury U.S. Treasury 0.875 912828KE9 Treasury Debt First Tier Security 2011-02-28 2011-02-28 N N N 215000000.00 215112599.84 0.0726 N 215134375.00 215134375.00 U.S. Treasury U.S. Treasury 4.5 912828EX4 Treasury Debt First Tier Security 2011-02-28 2011-02-28 N N N 50000000.00 50160236.00 0.0169 N 50168000.00 50168000.00 U.S. Treasury U.S. Treasury 0.176 9127952D2 Treasury Debt First Tier Security 2011-03-03 2011-03-03 N N N 30000000.00 29995600.00 0.0101 N 29996490.00 29996490.00 U.S. Treasury U.S. Treasury 0.184 912795V99 Treasury Debt First Tier Security 2011-03-10 2011-03-10 N N N 100000000.00 99981088.88 0.0337 N 99985400.00 99985400.00 U.S. Treasury U.S. Treasury 0.150 9127952G5 Treasury Debt First Tier Security 2011-03-17 2011-03-17 N N N 200000000.00 199963333.36 0.0675 N 199965200.00 199965200.00 U.S. Treasury U.S. Treasury 0.180 9127952J9 Treasury Debt First Tier Security 2011-03-31 2011-03-31 N N N 100000000.00 99971000.00 0.0337 N 99979100.00 99979100.00 U.S. Treasury U.S. Treasury 4.75 912828FA3 Treasury Debt First Tier Security 2011-03-31 2011-03-31 N N N 115000000.00 115838837.00 0.0391 N 115853530.00 115853530.00 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 25040596.23 0.0085 N 25045900.00 25045900.00 U.S. Treasury U.S. Treasury 0.195 9127952S9 Treasury Debt First Tier Security 2011-05-26 2011-05-26 N N N 25000000.00 24984562.50 0.0084 N 24988750.00 24988750.00 U.S. Treasury U.S. Treasury 1 912828LG3 Treasury Debt First Tier Security 2011-07-31 2011-07-31 N N N 50000000.00 50175230.23 0.0169 N 50207050.00 50207050.00 U.S. Treasury U.S. Treasury 4.625 912828FS4 Treasury Debt First Tier Security 2011-08-31 2011-08-31 N N N 25000000.00 25627940.39 0.0086 N 25639650.00 25639650.00 U.S. Treasury U.S. Treasury 4.5 912828FU9 Treasury Debt First Tier Security 2011-09-30 2011-09-30 N N N 25000000.00 25702633.88 0.0087 N 25709000.00 25709000.00 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 25811753.07 0.0087 N 25818375.00 25818375.00 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 15175869.69 0.0051 N 15178710.00 15178710.00 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 62088033.66 0.0210 N 62109360.00 62109360.00 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 105738096.63 0.0357 N 105795690.00 105795690.00 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 50385265.65 0.0170 N 50398450.00 50398450.00