SUNAMERICA SERIES TRUST
Supplement to the Statement of Additional Information
Dated May 1, 2008

Under the heading SUPPLEMENTAL GLOSSARY, the definition titled DERIVATIVES is deleted in its entirety and replaced with the following.

     “DERIVATIVES. A derivative is any financial instrument whose value is based on, and determined by, another security, index or benchmark (i.e., stock options, futures, caps, floors, etc.). In recent years, derivative securities have become increasingly important in the field of finance. Futures and options are now actively traded on many different exchanges. Forward contracts, swaps, and many different types of options are regularly traded outside of exchanges by financial institutions in what are termed “over the counter” markets. Other more specialized derivative securities often form part of a bond or stock issue. To the extent a contract is used to hedge another position in a Portfolio, the Portfolio will be exposed to the risks associated with hedging as described in this glossary. To the extent an option or futures contract is used to enhance return, rather than as a hedge, a Portfolio will be directly exposed to the risks of the contract. Gains or losses from non-hedging positions may be substantially greater than the cost of the position.”

Dated: May 1, 2008