Which Foreign governments own the most U.S. debt?

48.7 percent of all marketable U.S. federal government debt is foreign-owned

The federal government accounts include the two Social Security trust funds, which together hold 16 percent of the total federal debt...this was suprising.

The largest portion of the total debt — about 40 percent — was held by federal government accounts plus the Federal Reserve banks. Since 2009, the Federal Reserve banks have been sharply increasing their holdings of Treasury securities to stimulate the economy, and as of March 31, they held just under $2 trillion of the national debt, or about 12 percent.

1. China, Mainland, $1266.3 billion dollars
2. Japan, $1221.1 billion dollars
3. Belgium, $353.9 billion dollars
4. Carib Bkg Ctrs, $311.5 billion dollars
5. Oil Exporters*, $279.4 billion dollars
6. Brazil, $262.3 billion dollars
7. Switzerland, $186.1 billion dollars
8. All Other, $179.0 billion dollars
9. Taiwan, $173.4 billion dollars
10. United Kingdom, $167.7 billion dollars

Public Debt: $12,931,900,593,260.86
Intragovernmental $5,056,239,108,715.41
Total U.S. National Debt: $17,988,139,701,976.27