Vanguard Institutional Index Funds. Holdings as of Jun 30, 2026, from Form N-PORT.
Share of net assets at the report date, for the whole fund across all share classes.
| Holding | Weight | Value | Shares or units |
|---|---|---|---|
| United States Treasury BillBond | 4.53% | $46.22M | 46,262,000 |
| United States Treasury BillBond | 3.76% | $38.33M | 38,338,000 |
| United States Treasury BillBond | 2.88% | $29.33M | 29,441,000 |
| United States Treasury BillBond | 2.47% | $25.16M | 25,194,000 |
| United States Treasury BillBond | 2.44% | $24.87M | 24,923,000 |
| United States Treasury BillBond | 2.42% | $24.68M | 24,752,000 |
| United States Treasury BillBond | 2.38% | $24.29M | 24,321,000 |
| United States Treasury BillBond | 2.29% | $23.29M | 23,429,000 |
| United States Treasury BillBond | 2.27% | $23.10M | 23,200,000 |
| United States Treasury BillBond | 2.26% | $23.05M | 23,061,000 |
| United States Treasury BillBond | 2.20% | $22.42M | 22,536,000 |
| United States Treasury BillBond | 2.02% | $20.62M | 20,665,000 |
| United States Treasury BillBond | 1.98% | $20.15M | 20,282,000 |
| United States Treasury BillBond | 1.94% | $19.75M | 19,941,000 |
| United States Treasury BillBond | 1.89% | $19.31M | 19,558,000 |
| United States Treasury BillBond | 1.77% | $18.07M | 18,360,000 |
| United States Treasury BillBond | 1.24% | $12.67M | 12,806,000 |
| United States Treasury BillBond | 1.24% | $12.66M | 12,809,000 |
| United States Treasury BillBond | 1.24% | $12.63M | 12,769,000 |
| United States Treasury BillBond | 1.19% | $12.17M | 12,267,000 |
| United States Treasury Note/BondBond | 1.19% | $12.16M | 12,341,000 |
| United States Treasury BillBond | 1.18% | $12.04M | 12,146,000 |
| United States Treasury BillBond | 1.16% | $11.83M | 11,917,000 |
| United States Treasury BillBond | 1.16% | $11.78M | 11,939,000 |
| United States Treasury BillBond | 1.16% | $11.77M | 11,941,000 |
| United States Treasury BillBond | 1.15% | $11.77M | 11,943,000 |
| United States Treasury Note/BondBond | 1.08% | $11.00M | 11,012,000 |
| United States Treasury Note/BondBond | 1.08% | $10.98M | 11,005,000 |
| United States Treasury Note/BondBond | 1.08% | $10.96M | 10,974,000 |
| United States Treasury BillBond | 1.07% | $10.92M | 10,962,000 |
| United States Treasury BillBond | 1.06% | $10.85M | 10,877,000 |
| United States Treasury Note/BondBond | 1.06% | $10.84M | 10,831,000 |
| United States Treasury BillBond | 1.06% | $10.78M | 10,844,000 |
| United States Treasury Note/BondBond | 1.05% | $10.75M | 10,754,000 |
| United States Treasury Note/BondBond | 1.05% | $10.70M | 10,699,000 |
| United States Treasury BillBond | 1.04% | $10.61M | 10,695,000 |
| United States Treasury BillBond | 1.04% | $10.61M | 10,696,000 |
| United States Treasury BillBond | 1.04% | $10.60M | 10,694,000 |
| United States Treasury Note/BondBond | 1.01% | $10.27M | 10,291,000 |
| United States Treasury BillBond | 0.99% | $10.10M | 10,171,000 |
| United States Treasury Note/BondBond | 0.99% | $10.06M | 10,055,000 |
| United States Treasury Note/BondBond | 0.98% | $9.97M | 9,966,000 |
| United States Treasury BillBond | 0.95% | $9.69M | 9,725,000 |
| United States Treasury BillBond | 0.94% | $9.57M | 9,612,000 |
| United States Treasury Note/BondBond | 0.93% | $9.47M | 9,465,000 |
| United States Treasury Note/BondBond | 0.92% | $9.42M | 9,409,000 |
| United States Treasury Note/BondBond | 0.89% | $9.11M | 9,236,000 |
| United States Treasury Note/BondBond | 0.88% | $8.96M | 9,056,000 |
| United States Treasury Note/BondBond | 0.88% | $8.93M | 8,994,000 |
| United States Treasury Note/BondBond | 0.88% | $8.93M | 9,009,000 |
Holdings from the fund's latest Form N-PORT; expense ratio (net of fee waivers) from the risk/return summary of its prospectus; fund type from Form N-CEN. Prices are end-of-day closes adjusted for splits; total return also reinvests distributions.