Vanguard® Extended Duration Treasury Index Fund
Schedule of Investments (unaudited)
As of May 31, 2026
The fund files its complete schedule of portfolio holdings with the Securities and Exchange Commission (SEC) for the first and third quarters of each fiscal year as an exhibit to its reports on Form N-PORT. The fund’s Form N-PORT reports are available on the SEC’s website at www.sec.gov.
      Coupon 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 Strip Coupon 0.000% 5/15/2046 62,000 21,937
  United States Treasury Strip Coupon 0.000% 8/15/2046 211,359 73,778
  United States Treasury Strip Coupon 0.000% 11/15/2046 211,453 72,786
  United States Treasury Strip Coupon 0.000% 2/15/2047 201,285 68,366
  United States Treasury Strip Coupon 0.000% 5/15/2047 200,826 67,489
  United States Treasury Strip Coupon 0.000% 8/15/2047 193,753 64,249
  United States Treasury Strip Coupon 0.000% 11/15/2047 193,156 63,394
  United States Treasury Strip Coupon 0.000% 2/15/2048 188,564 61,040
  United States Treasury Strip Coupon 0.000% 5/15/2048 185,993 59,452
  United States Treasury Strip Coupon 0.000% 8/15/2048 188,132 59,357
  United States Treasury Strip Coupon 0.000% 11/15/2048 182,211 56,792
  United States Treasury Strip Coupon 0.000% 2/15/2049 182,025 55,980
  United States Treasury Strip Coupon 0.000% 5/15/2049 179,797 54,613
  United States Treasury Strip Coupon 0.000% 8/15/2049 199,780 59,817
  United States Treasury Strip Coupon 0.000% 11/15/2049 204,534 60,641
  United States Treasury Strip Coupon 0.000% 2/15/2050 184,409 53,875
  United States Treasury Strip Coupon 0.000% 5/15/2050 205,095 58,973
  United States Treasury Strip Coupon 0.000% 8/15/2050 203,083 57,791
  United States Treasury Strip Coupon 0.000% 11/15/2050 201,436 56,630
  United States Treasury Strip Coupon 0.000% 2/15/2051 194,780 54,059
  United States Treasury Strip Coupon 0.000% 5/15/2051 191,751 52,544
  United States Treasury Strip Coupon 0.000% 8/15/2051 208,077 56,449
  United States Treasury Strip Coupon 0.000% 11/15/2051 205,228 55,035
  United States Treasury Strip Coupon 0.000% 2/15/2052 203,301 53,676
  United States Treasury Strip Coupon 0.000% 5/15/2052 203,910 53,168
  United States Treasury Strip Coupon 0.000% 8/15/2052 200,869 51,802
  United States Treasury Strip Coupon 0.000% 11/15/2052 194,836 49,341
  United States Treasury Strip Coupon 0.000% 2/15/2053 190,294 47,945
  United States Treasury Strip Coupon 0.000% 5/15/2053 201,044 49,908
  United States Treasury Strip Coupon 0.000% 8/15/2053 202,271 49,738
  United States Treasury Strip Coupon 0.000% 11/15/2053 206,195 50,075
  United States Treasury Strip Coupon 0.000% 2/15/2054 204,681 48,996
  United States Treasury Strip Coupon 0.000% 5/15/2054 217,000 51,605
  United States Treasury Strip Coupon 0.000% 8/15/2054 208,209 49,490
  United States Treasury Strip Coupon 0.000% 11/15/2054 217,917 51,568
  United States Treasury Strip Coupon 0.000% 2/15/2055 224,769 52,619
  United States Treasury Strip Coupon 0.000% 5/15/2055 208,535 48,574
  United States Treasury Strip Coupon 0.000% 8/15/2055 62,812 14,466
  United States Treasury Strip Coupon 0.000% 11/15/2055 20,603 4,727
  United States Treasury Strip Coupon 0.000% 2/15/2056 22,497 5,117
  United States Treasury Strip Coupon 0.000% 5/15/2056 11,623 2,589
  United States Treasury Strip Principal 0.000% 8/15/2046 203,998 72,882
  United States Treasury Strip Principal 0.000% 11/15/2046 178,445 62,874
  United States Treasury Strip Principal 0.000% 2/15/2047 178,143 61,960
  United States Treasury Strip Principal 0.000% 5/15/2047 183,775 63,122
  United States Treasury Strip Principal 0.000% 8/15/2047 185,587 62,831
  United States Treasury Strip Principal 0.000% 11/15/2047 178,029 59,487
  United States Treasury Strip Principal 0.000% 2/15/2048 176,580 58,230
  United States Treasury Strip Principal 0.000% 5/15/2048 162,249 52,794
  United States Treasury Strip Principal 0.000% 8/15/2048 173,675 55,786
  United States Treasury Strip Principal 0.000% 11/15/2048 173,608 55,080
  United States Treasury Strip Principal 0.000% 2/15/2049 172,306 53,940
  United States Treasury Strip Principal 0.000% 5/15/2049 168,683 52,107
  United States Treasury Strip Principal 0.000% 8/15/2049 165,474 50,483
  United States Treasury Strip Principal 0.000% 11/15/2049 171,765 51,724
  United States Treasury Strip Principal 0.000% 2/15/2050 175,577 52,221
  United States Treasury Strip Principal 0.000% 5/15/2050 175,100 51,627
  United States Treasury Strip Principal 0.000% 8/15/2050 181,717 52,783
  United States Treasury Strip Principal 0.000% 11/15/2050 185,666 53,161
  United States Treasury Strip Principal 0.000% 2/15/2051 189,230 53,413
  United States Treasury Strip Principal 0.000% 5/15/2051 195,530 54,481
  United States Treasury Strip Principal 0.000% 8/15/2051 196,542 54,118
      Coupon Maturity
Date 		Face
Amount
($000) 		Market
Value
($000)
  United States Treasury Strip Principal 0.000% 11/15/2051 190,042 51,764
  United States Treasury Strip Principal 0.000% 2/15/2052 185,030 49,727
  United States Treasury Strip Principal 0.000% 5/15/2052 187,754 49,938
  United States Treasury Strip Principal 0.000% 8/15/2052 187,948 49,344
  United States Treasury Strip Principal 0.000% 11/15/2052 180,985 47,007
  United States Treasury Strip Principal 0.000% 2/15/2053 181,569 46,598
  United States Treasury Strip Principal 0.000% 5/15/2053 185,503 47,093
  United States Treasury Strip Principal 0.000% 8/15/2053 186,224 46,840
  United States Treasury Strip Principal 0.000% 11/15/2053 190,527 47,505
  United States Treasury Strip Principal 0.000% 2/15/2054 196,660 48,412
  United States Treasury Strip Principal 0.000% 5/15/2054 195,555 47,743
  United States Treasury Strip Principal 0.000% 8/15/2054 195,692 47,257
  United States Treasury Strip Principal 0.000% 11/15/2054 199,294 47,597
  United States Treasury Strip Principal 0.000% 2/15/2055 204,788 48,429
  United States Treasury Strip Principal 0.000% 5/15/2055 207,819 48,594
  United States Treasury Strip Principal 0.000% 8/15/2055 305,464 70,698
  United States Treasury Strip Principal 0.000% 11/15/2055 392,891 90,058
  United States Treasury Strip Principal 0.000% 2/15/2056 368,205 83,652
  United States Treasury Strip Principal 0.000% 5/15/2056 203,945 45,808
Total U.S. Government and Agency Obligations (Cost $5,307,080) 4,279,619
          Shares  
Temporary Cash Investments (0.0%)
Money Market Fund (0.0%)
1 Vanguard Market Liquidity Fund (Cost $201) 3.667%   2,007 201
Total Investments (100.0%) (Cost $5,307,281)   4,279,820
Other Assets and Liabilities—Net (0.0%)   (57)
Net Assets (100%)   4,279,763
Cost is in $000.
1 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—Quoted prices in active markets for identical securities.
Level 2—Other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.).
Level 3—Significant unobservable inputs (including the fund’s own assumptions used to determine the fair value of investments). Any investments valued with significant unobservable inputs are noted on the Schedule of Investments.
The following table summarizes the market value of the fund's investments as of May 31, 2026, based on the inputs used to value them:
  Level 1
($000) 		Level 2
($000) 		Level 3
($000) 		Total
($000)
Investments        
Assets        
U.S. Government and Agency Obligations — 4,279,619 — 4,279,619
Temporary Cash Investments 201 — — 201
Total 201 4,279,619 — 4,279,820