# EDGAR Filing Document

**Accession Number:** 0000106444
**File Stem:** 0000106444-26-000169
**Filing Date:** 2026-5
**Character Count:** 6919
**Document Hash:** 50e11bf3920769d87e7df52eb944cf94
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000106444-26-000169.hdr.sgml**: 20260511

**ACCESSION NUMBER**: 0000106444-26-000169

**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 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:** 26961099

**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 Short-Term Treasury Fund (Series ID: S000002583)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VFISX         | C000007089 |
| Admiral Shares  | VFIRX         | C000007090 |

---

### Vanguard Intermediate-Term Treasury Fund (Series ID: S000002587)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VFITX         | C000007099 |
| Admiral Shares  | VFIUX         | C000007100 |

---

### Vanguard Long-Term Treasury Fund (Series ID: S000002589)

---

|  |  |  |
|:---|:---|:---|
| Class Name      | Ticker Symbol | Class ID   |
| Investor Shares | VUSTX         | C000007103 |
| Admiral Shares  | VUSUX         | C000007104 |

---

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

---

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

---

## Series and Classes Contracts Data

### Vanguard Short-Term Treasury Fund (Series ID: S000002583)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007089 | Investor Shares | VFISX           |
| C000007090 | Admiral Shares  | VFIRX           |

### Vanguard Intermediate-Term Treasury Fund (Series ID: S000002587)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007099 | Investor Shares | VFITX           |
| C000007100 | Admiral Shares  | VFIUX           |

### Vanguard Long-Term Treasury Fund (Series ID: S000002589)

| Class ID   | Class Name      | Ticker Symbol   |
|:---|:---|:---|
| C000007103 | Investor Shares | VUSTX           |
| C000007104 | Admiral Shares  | VUSUX           |

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

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

![](g2gqcupr475ru237joh09.jpg)

**Vanguard Short-Term Federal Fund**

**Vanguard Intermediate-Term Treasury Fund**

**Vanguard Long-Term Treasury Fund**

**Vanguard Short-Term Treasury Fund**

**Supplement Dated May 11, 2026, to the Prospectus and Summary Prospectus Dated May 29, 2025**

**Important Changes to Vanguard Short-Term Treasury Fund, Vanguard Intermediate-Term Treasury Fund, Vanguard Long-Term Treasury Fund, and Vanguard Short-Term Federal Fund (the "Funds")**

Effective today, John Madziyire no longer serves as a co-portfolio manager for Vanguard Short-Term Treasury Fund, Vanguard Intermediate-Term Treasury Fund, and Vanguard Long-Term Treasury Fund.

In addition, Alexander Payne has been added as a co-portfolio manager for Vanguard Short-Term Federal Fund.

The Funds' investment objectives, strategies, and policies remain unchanged.

**Prospectus and Summary Prospectus Changes**

All references to Mr. Madziyire are hereby removed.

The following is added under the heading "Investment Advisor" in the **Fund Summary** section for Vanguard Short-Term Federal Fund:

Alexander Payne, CFA, Portfolio Manager at VCM. He has co-managed the Fund since May 2026.

**Prospectus Text Changes**

All references to Mr. Madziyire are hereby removed.

The following is added under the heading "Investment Advisor" in the **More on the Fund(s)** section:

**Alexander Payne**, CFA, Portfolio Manager at VCM. He has worked in investment management since 2006, has been with Vanguard since 2026, and has co-managed the Fund since May 2026. Education: B.A.,

Dartmouth College.

CFA<sup>®</sup> is a registered trademark owned by CFA Institute.© 2026 The Vanguard Group, Inc. All rights reserved. PS 028B 052026 <br> Vanguard Marketing Corporation, Distributor.

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![](vanguard.jpg)

**Vanguard Fixed Income Securities Funds (the "Trust")**

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

**Supplement Dated May 11, 2026, to the Statement of Additional Information Dated May 29, 2025**

Effective today, John Madziyire no longer serves as a co-portfolio manager for Vanguard Short-Term Treasury Fund, Vanguard Intermediate-Term Treasury Fund, and Vanguard Long-Term Treasury Fund. All references to Mr. Madziyire are hereby removed.

In addition, Alexander Payne has been added as a co-portfolio manager for Vanguard Short-Term Federal Fund (the "Fund").

The Statement of Additional Information, as supplemented, provides information about the portfolio managers of all funds within the Trust, including the Fund, as of January 31, 2025. The table and text below provide updated information as of March 31, 2026, relating only to Mr. Payne.

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

**Other Accounts Managed** 

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| **Portfolio Manager** |  | **No. of** <br> **accounts**<br>| **Total assets** | **No. of accounts with**<br> **performance-based** <br> **fees**<br>| **Total assets in**<br> **accounts with**<br> **performance-based** <br> **fees**<br>|
| Alexander Payne | Registered investment companies | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 |
|  | Other pooled investment vehicles | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 |
|  | Other accounts | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 | &nbsp;&nbsp;&nbsp; 0 | &nbsp;&nbsp;&nbsp; $0 |

---

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

**Ownership of Securities**

As of March 31, 2026, Mr. Payne did not own any shares of the Fund.© 2026 The Vanguard Group, Inc. All rights reserved.

Vanguard Marketing Corporation, Distributor.

**SAI 028B 052026**

------