The Vanguard Short-Term Treasury Fund Admiral Shares (VFIRX) is a mutual fund that primarily invests in short-term U.S. Treasury securities. This fund is designed for investors seeking a low-risk, conservative investment option with a focus on preserving capital and generating income. With the "Admiral Shares" designation, this fund offers lower expense ratios and higher minimum investment requirements compared to other share classes, making it an attractive option for more experienced and affluent investors. VFIRX is managed by Vanguard, a reputable and well-established investment management company known for its low-cost index funds.