The Social Security trust funds, managed by the Department of the Treasury, are the Old-Age and Survivors Insurance (OASI) and Disability Insurance (DI) Trust Funds. Since the beginning of the Social Security program, all securities held by the trust funds have been issued by the Federal Government.

There are two general types of such securities:

  1. special issues—securities available only to the trust funds; and
  2. public issues—securities available to the public (marketable securities).
Today all securities held by the trust funds are special issues, but the funds have held public issues in the past.

Monthly reports from the Bureau of the Fiscal Service provide data on the amount held at the end of the month by type of security, interest rate, and maturity date. The form below provides a summary of the transactions of the trust funds for a given time period. Data are available for 1990 and later.

Trust fund              
Year     (data available after 1989)