# EDGAR Filing Document

**Accession Number:** 0000794105
**File Stem:** 0000794105-26-000130
**Filing Date:** 2026-5
**Character Count:** 3434
**Document Hash:** 7877a8f67cdb333238d6b36c7c9d7fa6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000794105-26-000130.hdr.sgml**: 20260511

**ACCESSION NUMBER**: 0000794105-26-000130

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260511

**DATE AS OF CHANGE**: 20260511

**EFFECTIVENESS DATE**: 20260511

**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:** 26961101

**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 Inflation-Protected Securities Fund (Series ID: S000019554)

---

|  |  |  |
|:---|:---|:---|
| Class Name           | Ticker Symbol | Class ID   |
| Investor Shares      | VIPSX         | C000054349 |
| Admiral Shares       | VAIPX         | C000054350 |
| Institutional Shares | VIPIX         | C000054351 |

---

## Series and Classes Contracts Data

### Vanguard Inflation-Protected Securities Fund (Series ID: S000019554)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000054349 | Investor Shares      | VIPSX           |
| C000054350 | Admiral Shares       | VAIPX           |
| C000054351 | Institutional Shares | VIPIX           |

![](ga646xj51nc4j6eudlshr.jpg)

**Vanguard Inflation-Protected Securities Fund**

**Supplement Dated May 11, 2026, to the Prospectus and Summary Prospectus Dated April 28, 2026**

**Important Change to Vanguard Inflation-Protected Securities Fund (the "Fund")**

Effective today, John Madziyire no longer serves as a co-portfolio manager of Vanguard Inflation-Protected Securities Fund.

All references to Mr. Madziyire in the Prospectus and Summary Prospectus are hereby removed. Brian Quigley remains as the sole portfolio manager of the Fund. The Fund's investment objective, strategies, and policies

remain unchanged.© 2026 The Vanguard Group, Inc. All rights reserved. PS 119A 052026 <br> Vanguard Marketing Corporation, Distributor.

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![](vanguard.jpg)

**Vanguard Bond Index Funds (the "Trust")**

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

**Supplement Dated May 11, 2026, to the Statement of Additional Information Dated April 28, 2026** 

Effective today, John Madziyire no longer serves as a co-portfolio manager of Vanguard Inflation-Protected Securities Fund (the "Fund").

All references to Mr. Madziyire in the Statement of Additional Information are hereby removed. Brian Quigley remains as the sole portfolio manager of the Fund. The Fund's investment objective, strategies, and policies remain unchanged.© 2026 The Vanguard Group, Inc. All rights reserved.

Vanguard Marketing Corporation, Distributor.

**SAI 084B 052026**

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