# EDGAR Filing Document

**Accession Number:** 0000106444
**File Stem:** 0001683863-25-005674
**Filing Date:** 2025-7
**Character Count:** 7175
**Document Hash:** c29f81f47d02287bd8d9bfd6c5f6223d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001683863-25-005674.hdr.sgml**: 20250710

**ACCESSION NUMBER**: 0001683863-25-005674

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 15

**FILED AS OF DATE**: 20250710

**DATE AS OF CHANGE**: 20250710

**EFFECTIVENESS DATE**: 20250710

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** VANGUARD FIXED INCOME SECURITIES FUNDS
- **CENTRAL INDEX KEY:** 0000106444

**ORGANIZATION NAME:**
- **EIN:** 231899003
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0131

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-47371
- **FILM NUMBER:** 251114946

**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 FIXED INCOME SECURITIES FUND INC
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** WESTMINSTER BOND FUND INC
- **DATE OF NAME CHANGE:** 19800619

## Series and Classes Contracts Data

### Vanguard Intermediate-Term Investment-Grade Fund (Series ID: S000002586)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VFICX         | C000007097 |
| Admiral Shares  | VFIDX         | C000007098 |

---

### Vanguard Long-Term Investment-Grade Fund (Series ID: S000002588)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VWESX         | C000007101 |
| Admiral Shares  | VWETX         | C000007102 |

---

### Vanguard Short-Term Federal Fund (Series ID: S000002590)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VSGBX         | C000007105 |
| Admiral Shares  | VSGDX         | C000007106 |

---

### Vanguard Short-Term Investment-Grade Fund (Series ID: S000002591)

---

|  |  |  |
|:---|:---|:---|
| Class Name           | Ticker Symbol | Class ID   |
| Investor Shares      | VFSTX         | C000007107 |
| Admiral Shares       | VFSUX         | C000007108 |
| Institutional Shares | VFSIX         | C000007109 |

---

## Series and Classes Contracts Data

### Vanguard Intermediate-Term Investment-Grade Fund (Series ID: S000002586)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007097 | Investor Shares | VFICX           |
| C000007098 | Admiral Shares  | VFIDX           |

### Vanguard Long-Term Investment-Grade Fund (Series ID: S000002588)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007101 | Investor Shares | VWESX           |
| C000007102 | Admiral Shares  | VWETX           |

### Vanguard Short-Term Federal Fund (Series ID: S000002590)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007105 | Investor Shares | VSGBX           |
| C000007106 | Admiral Shares  | VSGDX           |

### Vanguard Short-Term Investment-Grade Fund (Series ID: S000002591)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000007107 | Investor Shares      | VFSTX           |
| C000007108 | Admiral Shares       | VFSUX           |
| C000007109 | Institutional Shares | VFSIX           |

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

![](vanguard.jpg)

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

Vanguard Short-Term Federal Fund

Vanguard Short-Term Investment-Grade Fund

Vanguard Intermediate-Term Investment-Grade Fund

Vanguard Long-Term Investment-Grade Fund

**Supplement Dated July 10, 2025, to the Prospectus and Summary Prospectuses Dated May 29, 2025**

**Prospectus Text Changes for Vanguard Short-Term Federal Fund** 

The paragraph under the heading "Principal Investment Strategies" in the prospectus is replaced with the following:

Under normal circumstances, the Fund will invest at least 80% of its assets in bonds issued or guaranteed by the U.S. government and its agencies and instrumentalities, many of which are not backed by the full faith and credit of the U.S. government. The Fund's investments will have a dollar-weighted average maturity of 1 to 4 years. The Fund may invest in derivatives instruments, such as options, futures contracts, and other swap agreements.

**Prospectus Text Changes for Vanguard Short-Term Investment-Grade Fund**

The paragraph under the heading "Principal Investment Strategies" in the prospectus is replaced with the following:

Under normal circumstances, the Fund will invest at least 80% of its assets in investment-grade securities (those of medium and high quality). The Fund's investments will have a dollar-weighted average maturity of 1 to 4 years. Investment-grade fixed income securities are those rated the equivalent of Baa3 and above by Moody's Ratings or another independent rating agency or, if unrated, are determined to be of comparable quality by the Fund's advisor. The Fund may invest in derivatives instruments, such as options, futures contracts, and other swap agreements.

------

**Prospectus Text Changes for Vanguard Intermediate-Term Investment-Grade Fund**

The paragraph under the heading "Principal Investment Strategies" in the prospectus is replaced with the following:

Under normal circumstances, at least 80% of the Fund's assets will be invested in investment-grade securities (those of medium and high quality). The Fund's investments will have a dollar-weighted average maturity of 5 to 10 years. Investment-grade fixed income securities are those rated the equivalent of Baa3 and above by Moody's Ratings or another independent rating agency or, if unrated, are determined to be of comparable quality by the Fund's advisor. The Fund may invest in derivatives instruments, such as options, futures contracts, and other swap agreements.

**Prospectus Text Changes for Vanguard Long-Term Investment-Grade Fund**

The paragraph under the heading "Principal Investment Strategies" in the prospectus is replaced with the following:

Under normal circumstances, the Fund will invest at least 80% of its assets in investment-grade securities (those of medium and high quality). The Fund's investments will have a dollar-weighted average maturity within a range that is five years shorter than or five years longer than that of its benchmark index, which had a dollar-weighted average maturity of 22.3 years as of January 31, 2025. Investment-grade fixed income securities are those rated the equivalent of Baa3 and above by Moody's Ratings or another independent rating agency or, if unrated, are determined to be of comparable quality by the Fund's advisor. The Fund may invest in derivatives instruments, such as options, futures contracts, and other swap agreements. The Fund uses multiple investment advisors. Each advisor independently selects and maintains a portfolio of securities for the Fund.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;© 2025 The Vanguard Group, Inc. All rights reserved.

Vanguard Marketing Corporation, Distributor.PS 028A 072025

------