Here:
http://www.ustreas.gov/tic/mfh.txt

Latest from Sep 27th, 2009:

                                       MAJOR FOREIGN HOLDERS OF TREASURY SECURITIES
                                                 (in billions of dollars)
                                               HOLDINGS 1/ AT END OF PERIOD


                       Jul     Jun     May     Apr     Mar     Feb     Jan     Dec     Nov     Oct     Sep     Aug     Jul
Country               2009    2009    2009    2009    2009    2009    2009    2008    2008    2008    2008    2008    2008
                     ------  ------  ------  ------  ------  ------  ------  ------  ------  ------  ------  ------  ------

China, Mainland       800.5   776.4   801.5   763.5   767.9   744.2   739.6   727.4   713.2   684.1   618.2   573.7   550.0
Japan                 724.5   711.8   677.2   685.9   686.7   661.9   634.8   626.0   625.2   629.6   617.5   630.3   637.6
United Kingdom 2/     220.0   214.0   163.8   152.8   128.2   129.1   123.9   130.9   132.4   133.2   112.8    82.5    66.1
Carib Bnkng Ctrs 4/   193.2   189.7   194.8   204.7   213.6   189.1   176.6   197.5   205.0   203.5   169.3   132.9   117.6
Oil Exporters 3/      189.2   191.0   192.9   189.5   192.0   181.7   186.6   186.2   187.2   176.7   171.2   169.6   162.9
Brazil                138.1   139.8   127.1   126.0   126.6   130.8   133.5   127.0   136.1   141.0   148.3   152.6   154.8
Russia                118.0   119.9   124.5   137.0   138.4   130.1   119.6   116.4   108.0   110.8    99.6   104.2   104.0
Hong Kong             115.3    99.8    93.2    80.9    78.9    76.3    71.7    77.2    70.6    69.8    65.5    65.8    65.2
Luxembourg             92.2   104.3    96.3    97.6   106.1    92.3    87.2    97.4    94.4   100.8   104.7    90.4    89.7
Taiwan                 77.4    77.0    75.7    78.3    74.8    72.6    73.3    71.8    70.2    65.9    63.0    66.2    67.9
Switzerland            68.1    71.6    63.7    64.2    67.7    68.2    62.1    62.3    63.8    62.0    49.7    45.9    45.7
Germany                56.3    53.9    55.2    54.6    55.0    56.6    56.4    56.1    54.0    53.7    51.6    51.8    51.7
Singapore              42.4    40.8    39.6    39.7    39.1    39.4    38.3    40.8    38.8    34.0    32.2    31.9    32.8
India                  38.9    39.3    38.8    38.5    38.2    34.6    32.5    29.2    22.3    18.3    20.3    20.2    19.0
Ireland                38.6    46.3    50.6    49.7    54.7    54.5    50.0    54.3    41.3    35.1    32.9    18.9    16.9
Korea                  37.6    36.3    37.4    35.4    33.1    33.3    31.3    31.3    32.7    36.2    40.2    42.1    39.4
Thailand               31.4    29.7    26.8    28.5    26.0    39.7    37.2    32.4    33.9    33.6    27.4    30.4    30.6
Norway                 28.9    28.7    28.3    27.5    26.2    21.1    21.9    23.1    20.2    11.5    13.2     2.4     2.8
Mexico                 27.7    29.5    31.6    35.4    36.3    37.9    34.9    34.8    33.8    32.2    32.5    32.6    34.3
Turkey                 27.3    27.5    28.8    27.2    30.2    32.4    31.3    30.8    29.0    27.9    31.5    34.3    32.7
France                 24.6    26.0    25.9    30.6    27.1    16.8    17.9    16.8    18.4    20.5    19.3    21.2    17.1