# EDGAR Filing Document

**Accession Number:** 0000794105
**File Stem:** 0001193125-26-032819
**Filing Date:** 2026-2
**Character Count:** 7624
**Document Hash:** 905c27a14bad897494762edc7c390b36
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-032819.hdr.sgml**: 20260202

**ACCESSION NUMBER**: 0001193125-26-032819

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 26

**FILED AS OF DATE**: 20260202

**DATE AS OF CHANGE**: 20260202

**EFFECTIVENESS DATE**: 20260202

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** VANGUARD BOND INDEX FUNDS
- **CENTRAL INDEX KEY:** 0000794105

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

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-06001
- **FILM NUMBER:** 26585971

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

**MAIL ADDRESS:**
- **STREET 1:** P.O. BOX 2600 V26
- **CITY:** VALLEY FORGE
- **STATE:** PA
- **ZIP:** 19482

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VANGUARD BOND INDEX FUND INC
- **DATE OF NAME CHANGE:** 19940111

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VANGUARD BOND MARKET FUND INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** VANGUARD INDEX BOND FUND
- **DATE OF NAME CHANGE:** 19870105

## Series and Classes Contracts Data

### Vanguard Intermediate-Term Bond Index Fund (Series ID: S000002561)

---

|  |  |  |
|:---|:---|:---|
| Class Name                | Ticker Symbol | Class ID   |
| Institutional Shares      | VBIMX         | C000024520 |
| Institutional Plus Shares | VBIUX         | C000105308 |

---

### Vanguard Long-Term Bond Index Fund (Series ID: S000002562)

---

|  |  |  |
|:---|:---|:---|
| Class Name                | Ticker Symbol | Class ID   |
| Institutional Shares      | VBLLX         | C000024522 |
| Institutional Plus Shares | VBLIX         | C000105309 |

---

### Vanguard Short-Term Bond Index Fund (Series ID: S000002563)

---

|  |  |  |
|:---|:---|:---|
| Class Name                | Ticker Symbol | Class ID   |
| Institutional Shares      | VBITX         | C000105310 |
| Institutional Plus Shares | VBIPX         | C000105311 |

---

## Series and Classes Contracts Data

### Vanguard Intermediate-Term Bond Index Fund (Series ID: S000002561)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000024520 | Institutional Shares      | VBIMX           |
| C000105308 | Institutional Plus Shares | VBIUX           |

### Vanguard Long-Term Bond Index Fund (Series ID: S000002562)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000024522 | Institutional Shares      | VBLLX           |
| C000105309 | Institutional Plus Shares | VBLIX           |

### Vanguard Short-Term Bond Index Fund (Series ID: S000002563)

| Class ID   | Class Name                | Ticker Symbol   |
|:---|:---|:---|
| C000105310 | Institutional Shares      | VBITX           |
| C000105311 | Institutional Plus Shares | VBIPX           |

?xml version='1.0' encoding='ASCII'? 497

![](vanguard.jpg)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

Vanguard Short-Term Bond Index Fund

Vanguard Intermediate-Term Bond Index Fund

Vanguard Long-Term Bond Index Fund

**Supplement to the Prospectus and Summary Prospectuses Dated April 29, 2025**

As approved by the Funds' Board of Trustees, Vanguard Short-Term Bond Index Fund, Vanguard Intermediate-Term Bond Index Fund, and Vanguard Long-Term Bond Index Fund (each, a "Fund") have reduced their expense ratios for Institutional Shares and Institutional Plus Shares. Effective February 2, 2026, the Annual Fund Operating Expenses table and the hypothetical expenses examples for each Fund are hereby deleted and replaced with the following:

**Prospectus and Summary Prospectus Text Changes for Vanguard Short-Term Bond Index Fund**

**Annual Fund Operating Expenses**

(Expenses that you pay each year as a percentage of the value of your investment)

---

| | | |
|:---|:---|:---|
|  | Institutional Shares | Institutional Plus Shares |
| Management Fees | 0.03<br> %<br>| 0.02% |
| 12b-1 Distribution Fee |  |  |
| Other Expenses | 0.00<br> %<br>| 0.00% |
| Total Annual Fund Operating Expenses<sup>1</sup> <br>| 0.03<br> %<br>| 0.02% |

---

The expense information shown in the table has been restated to reflect current fees.

Examples

These examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The examples also assume that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | 1 Year | 3 Years | 5 Years | 10 Years |
| Institutional Shares | $3 | $10 | $17 | $39 |
| Institutional Plus Shares | $2 | $6 | $11 | $26 |

---

------

**Prospectus and Summary Prospectus Text Changes for Vanguard Intermediate-Term Bond Index Fund**

**Annual Fund Operating Expenses**

(Expenses that you pay each year as a percentage of the value of your investment)

---

| | | |
|:---|:---|:---|
|  | Institutional Shares | Institutional Plus Shares |
| Management Fees | 0.03<br> %<br>| 0.02% |
| 12b-1 Distribution Fee |  |  |
| Other Expenses | 0.00<br> %<br>| 0.00% |
| Total Annual Fund Operating Expenses<sup>1</sup> <br>| 0.03<br> %<br>| 0.02% |

---

The expense information shown in the table has been restated to reflect current fees.

Examples

These examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The examples also assume that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | 1 Year | 3 Years | 5 Years | 10 Years |
| Institutional Shares | $3 | $10 | $17 | $39 |
| Institutional Plus Shares | $2 | $6 | $11 | $26 |

---

**Prospectus and Summary Prospectus Text Changes for Vanguard Long-Term Bond Index Fund**

**Annual Fund Operating Expenses**

(Expenses that you pay each year as a percentage of the value of your investment)

---

| | | |
|:---|:---|:---|
|  | Institutional Shares | Institutional Plus Shares |
| Management Fees | 0.03<br> %<br>| 0.02% |
| 12b-1 Distribution Fee |  |  |
| Other Expenses | 0.00<br> %<br>| 0.00% |
| Total Annual Fund Operating Expenses<sup>1</sup> <br>| 0.03<br> %<br>| 0.02% |

---

The expense information shown in the table has been restated to reflect current fees.

Examples

These examples are intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The examples assume that you invest $10,000 in the Fund for the time periods indicated and then redeem all of

------

your shares at the end of those periods. The examples also assume that your investment has a 5% return each year and that the Fund's operating expenses remain the same.

---

| | | | | |
|:---|:---|:---|:---|:---|
|  | 1 Year | 3 Years | 5 Years | 10 Years |
| Institutional Shares | $53 | $60 | $67 | $88 |
| Institutional Plus Shares | $52 | $56 | $61 | $76 |

---

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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;© 2026 The Vanguard Group, Inc. All rights reserved. Vanguard Marketing Corporation, Distributor. PSI 504A 022026

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