The investment seeks to track the performance of a market-weighted Treasury index with a short-term dollar-weighted average maturity. The fund employs an indexing investment approach designed to track the performance of the Bloomberg US Treasury 1-3 Year Index. This index includes fixed income securities issued by the U.S. Treasury (not including inflation-protected securities, floating rate securities and certain other security types), all with maturities between 1 and 3 years. At least 80% of the fund's assets will be invested in bonds included in the index.