| Yield1 | Maturity Date | Face Amount ($000) | Market Value ($000) | ||
| U.S. Government and Agency Obligations (100.0%) | |||||
| U.S. Government Securities (100.0%) | |||||
| United States Treasury Bill | 1.844%–3.630% | 4/2/2026 | 350,337 | 350,302 | |
| United States Treasury Bill | 2.687%–3.637% | 4/7/2026 | 382,488 | 382,257 | |
| United States Treasury Bill | 2.844%–3.628% | 4/9/2026 | 345,356 | 345,079 | |
| United States Treasury Bill | 3.085%–3.630% | 4/14/2026 | 371,676 | 371,189 | |
| United States Treasury Bill | 3.146%–3.631% | 4/16/2026 | 427,714 | 427,065 | |
| United States Treasury Bill | 3.254%–3.634% | 4/21/2026 | 366,980 | 366,240 | |
| United States Treasury Bill | 3.283%–3.642% | 4/23/2026 | 356,955 | 356,162 | |
| United States Treasury Bill | 3.345%–3.643% | 4/28/2026 | 367,948 | 366,945 | |
| United States Treasury Bill | 3.371%–3.651% | 4/30/2026 | 355,809 | 354,769 | |
| United States Treasury Bill | 3.414%–3.637% | 5/5/2026 | 225,726 | 224,954 | |
| United States Treasury Bill | 3.429%–3.640% | 5/7/2026 | 345,347 | 344,090 | |
| United States Treasury Bill | 3.460%–3.641% | 5/12/2026 | 221,437 | 220,520 | |
| United States Treasury Bill | 3.471%–3.638% | 5/14/2026 | 300,710 | 299,401 | |
| United States Treasury Bill | 3.495%–3.642% | 5/19/2026 | 205,450 | 204,453 | |
| United States Treasury Bill | 3.493%–3.643% | 5/21/2026 | 233,201 | 232,022 | |
| United States Treasury Bill | 3.513%–3.642% | 5/26/2026 | 200,127 | 199,013 | |
| United States Treasury Bill | 3.521%–3.652% | 5/28/2026 | 236,341 | 234,977 | |
| United States Treasury Bill | 3.524%–3.650% | 6/2/2026 | 89,342 | 88,785 | |
| United States Treasury Bill | 3.524%–3.651% | 6/4/2026 | 229,025 | 227,551 | |
| United States Treasury Bill | 3.542%–3.653% | 6/9/2026 | 84,178 | 83,597 | |
| United States Treasury Bill | 3.546%–3.657% | 6/11/2026 | 300,089 | 297,953 | |
| United States Treasury Bill | 3.537%–3.655% | 6/16/2026 | 84,871 | 84,223 | |
| United States Treasury Bill | 3.556%–3.664% | 6/18/2026 | 231,894 | 230,080 | |
| United States Treasury Bill | 3.566%–3.653% | 6/23/2026 | 86,651 | 85,932 | |
| United States Treasury Bill | 3.574%–3.661% | 6/25/2026 | 236,425 | 234,418 | |
| United States Treasury Bill | 3.578%–3.659% | 6/30/2026 | 80,573 | 79,847 | |
| Total U.S. Government and Agency Obligations (Cost $6,691,971) | 6,691,824 | ||||
| Shares | |||||
| Temporary Cash Investments (0.0%) | |||||
| Money Market Fund (0.0%) | |||||
| 2 | Vanguard Market Liquidity Fund (Cost $98) | 3.687% | 983 | 98 | |
| Total Investments (100.0%) (Cost $6,692,069) | 6,691,922 | ||||
| Other Assets and Liabilities—Net (0.0%) | 2,854 | ||||
| Net Assets (100%) | 6,694,776 | ||||
| Cost is in $000. | |||||
| 1 | Represents annualized yield at date of purchase for discount securities, and coupon for coupon-bearing securities. |
| 2 | Affiliated money market fund available only to Vanguard funds and certain trusts and accounts managed by Vanguard. Rate shown is the 7-day yield. |
| A. | Security Valuation: Securities are valued as of the close of trading on the New York Stock Exchange (generally 4 p.m., Eastern time) on the valuation date. Bonds and other temporary cash investments are valued using the latest bid prices or using valuations based on a matrix system (which considers such factors as security prices, yields, maturities, and ratings), both as furnished by independent pricing services. Investments in Vanguard Market Liquidity Fund are valued at that fund's net asset value. Securities for which market quotations are not readily available, or whose values have been affected by events occurring before the fund’s pricing time but after the close of the securities’ primary markets, are valued by methods deemed by the valuation designee to represent fair value and subject to oversight by the board of trustees. |
| B. | Various inputs may be used to determine the value of the fund’s investments. These inputs are summarized in three broad levels for financial statement purposes. The inputs or methodologies used to value securities are not necessarily an indication of the risk associated with investing in those securities. |
| Level 1 ($000) | Level 2 ($000) | Level 3 ($000) | Total ($000) | |
| Investments | ||||
| Assets | ||||
| U.S. Government and Agency Obligations | — | 6,691,824 | — | 6,691,824 |
| Temporary Cash Investments | 98 | — | — | 98 |
| Total | 98 | 6,691,824 | — | 6,691,922 |