# EDGAR Filing Document

**Accession Number:** 0000862084
**File Stem:** 0000862084-25-000044
**Filing Date:** 2025-8
**Character Count:** 14534
**Document Hash:** 8ede87eaed1d9c535b4a1e8e2b0f9788
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000862084-25-000044.hdr.sgml**: 20250827

**ACCESSION NUMBER**: 0000862084-25-000044

**CONFORMED SUBMISSION TYPE**: NPORT-P

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20250630

**FILED AS OF DATE**: 20250827

**DATE AS OF CHANGE**: 20250827

**PERIOD START**: 20251231

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** VANGUARD INSTITUTIONAL INDEX FUNDS
- **CENTRAL INDEX KEY:** 0000862084

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** NPORT-P
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-06093
- **FILM NUMBER:** 251264968

**BUSINESS ADDRESS:**
- **STREET 1:** PO BOX 2600
- **STREET 2:** V26
- **CITY:** VALLEY FORGE
- **STATE:** PA
- **ZIP:** 19482
- **BUSINESS PHONE:** 6106691000

**MAIL ADDRESS:**
- **STREET 1:** PO BOX 2600
- **STREET 2:** V26
- **CITY:** VALLEY FORGE
- **STATE:** PA
- **ZIP:** 19482

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VANGUARD INSTITUTIONAL INDEX FUND
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VANGUARD INSTITUTIONAL EQUITY INDEX FUND INC
- **DATE OF NAME CHANGE:** 19900701

## Series and Classes Contracts Data

### Vanguard 0-3 Month Treasury Bill ETF (Series ID: S000090172)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000257083 | ETF Shares   | VBIL            |

## Form NPORT-P: Monthly Portfolio Investments Report

### NPORT-P: Part A: General Information

**Item A.1. Information about the Registrant.**

- **a. Name of Registrant:** VANGUARD INSTITUTIONAL INDEX FUNDS

- **b. Investment Company Act file number:** 811-06093

- **c. CIK number of Registrant:** 0000862084

- **d. LEI of Registrant:** 549300HU31ENFT74XN04

- **e. Address and telephone number of Registrant.**

  - **Street Address 1:** 100 Vanguard Boulevard

  - **City:** Malvern

  - **State:** PA

  - **Foreign country:** US

  - **Zip / Postal Code:** 19355

  - **Telephone number:** 610-669-1000

**Item A.2. Information about the Series.**

- **a. Name of Series:** VANGUARD 0-3 MONTH TREASURY BILL ETF

- **b. EDGAR series identifier (if any):** S000090172

- **c. LEI of Series:** 52990070DGBTWFWX8S21

**Item A.3. Reporting period.**

- **a. Date of fiscal year-end:** 2025-12-31

- **b. Date as of which information is reported:** 2025-06-30

**Item A.4. Final filing**

Does the Fund anticipate that this will be its final filing on Form N-PORT? **No**

### Fund Information

**Total Assets:** $1871851576.55

**Total Liabilities:** $52174.47

**Net Assets:** $1871799402.08

**Cash Not Reported:** $419192.53

**Currency Risk Metrics (dv01):**

- 

**Credit Spread Risk - Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Credit Spread Risk - Non-Investment Grade (dv01):**

- **3-Month:** 0.00000000 | **1-Year:** 0.00000000 | **5-Year:** 0.00000000 | **10-Year:** 0.00000000 | **30-Year:** 0.00000000

**Monthly Return Information**

| Class               | Month 1 Return (%)   | Month 2 Return (%)   | Month 3 Return (%)   |
|:---|:---|:---|:---|
| Class ID C000257083 | 0.36%                | 0.36%                | 0.35%                |

**Monthly Gains & Losses**

| Period   | Net Realized Gain/Loss   | Net Unrealized Appreciation/Depreciation   |
|:---|:---|:---|
| Month 1  | $-67.15                  | $-2558.85                                  |
| Month 2  | $-196.09                 | $339656.19                                 |
| Month 3  | $-374.69                 | $-380377.59                                |

### Schedule of Portfolio Investments

| Name                                              | Title                          | Identifiers                                   | Payoff Profile   | Asset Category   | Issuer Category   | Country   |   Balance | Units   | Value (USD)   | % of Net Assets   | Maturity Date   | Coupon Type   | Annualized Rate (%)   | Restricted?   |   Fair Value Level | Lending Status   |
|:---|:---|:---|:---|:---|:---|:---|---:|:---|:---|:---|:---|:---|:---|:---|---:|:---|
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797NX1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 100652000 | PA      | $100628542.03 | 5.38%             | 2025-07-03      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797LW5<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 123318000 | PA      | $123188670.46 | 6.58%             | 2025-07-10      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QC4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  87928000 | PA      | $87643845.62  | 4.68%             | 2025-07-29      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QB6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  93015000 | PA      | $92788469.27  | 4.96%             | 2025-07-22      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PP6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  67491000 | PA      | $67077955.08  | 3.58%             | 2025-08-21      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PG6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  96314000 | PA      | $95979710.55  | 5.13%             | 2025-07-31      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QU4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  25979000 | PA      | $25743121.58  | 1.38%             | 2025-09-16      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QV2<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  26120000 | PA      | $25863109.81  | 1.38%             | 2025-09-23      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PN1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  68836000 | PA      | $68473807.72  | 3.66%             | 2025-08-14      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797MG9<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        | 116268000 | PA      | $115758940.39 | 6.18%             | 2025-08-07      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QA8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  92974000 | PA      | $92823769.85  | 4.96%             | 2025-07-15      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| Vanguard Cmt Funds-Vanguard Market Liquidity Fund | Vanguard Market Liquidity Fund | CUSIP: N/A<br>LEI: 1I6HV0TLSTR3A4XQ6L78       | Long             | STIV             | CORP              | US        |   2437712 | NS      | $2437468.23   | 0.13%             |  |  |  | No            |                  1 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PW1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  66184000 | PA      | $65620774.16  | 3.51%             | 2025-09-11      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PU5<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  95224000 | PA      | $95212983.57  | 5.09%             | 2025-07-01      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PZ4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  93050000 | PA      | $92974732.77  | 4.97%             | 2025-07-08      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PY7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  45276000 | PA      | $44822271.55  | 2.39%             | 2025-09-25      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QJ9<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  52457000 | PA      | $52193534.83  | 2.79%             | 2025-08-12      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797MH7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  88003000 | PA      | $87325316.19  | 4.67%             | 2025-09-04      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QL4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  52931000 | PA      | $52574891.91  | 2.81%             | 2025-08-26      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QK6<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  52419000 | PA      | $52110776.28  | 2.78%             | 2025-08-19      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QH3<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  53147000 | PA      | $52926624.35  | 2.83%             | 2025-08-05      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QT7<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  26280000 | PA      | $26063847.04  | 1.39%             | 2025-09-09      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797QM2<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  26469000 | PA      | $26271210.44  | 1.40%             | 2025-09-02      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PX9<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  66294000 | PA      | $65680080.42  | 3.51%             | 2025-09-18      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PF8<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  96481000 | PA      | $96223650.47  | 5.14%             | 2025-07-24      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PQ4<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  67013000 | PA      | $66544430.33  | 3.56%             | 2025-08-28      | None          | 0.00%                 | No            |                  2 | On Loan: No      |
| United States Treasury Bill                       | TREASURY BILL                  | CUSIP: 912797PE1<br>LEI: 254900HROIFWPRGM1V77 | Long             | DBT              | UST               | US        |  96586000 | PA      | $96407852.86  | 5.15%             | 2025-07-17      | None          | 0.00%                 | No            |                  2 | On Loan: No      |

### Signature

**Date Signed:** 2025-08-27

**Name of Applicant:** VANGUARD INSTITUTIONAL INDEX FUNDS

**Signature:** Ashley Grim

**Name of Signer:** Ashley Grim

**Title:** Treasurer