# EDGAR Filing Document

**Accession Number:** 0001120924
**File Stem:** 0001999371-25-015510
**Filing Date:** 2025-10
**Character Count:** 2486
**Document Hash:** 1cb3dd2a110e8ff4e4aa1ea7bf1d7bc3
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-25-015510.hdr.sgml**: 20251016

**ACCESSION NUMBER**: 0001999371-25-015510

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251016

**DATE AS OF CHANGE**: 20251016

**EFFECTIVENESS DATE**: 20251016

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** T. Rowe Price QM U.S. Bond Index Fund, Inc.
- **CENTRAL INDEX KEY:** 0001120924

**ORGANIZATION NAME:**
- **EIN:** 522273334
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-45018
- **FILM NUMBER:** 251396635

**BUSINESS ADDRESS:**
- **STREET 1:** 1307 POINT STREET
- **CITY:** BALTIMORE
- **STATE:** MD
- **ZIP:** 21231
- **BUSINESS PHONE:** 410-345-2000

**MAIL ADDRESS:**
- **STREET 1:** 1307 POINT STREET
- **CITY:** BALTIMORE
- **STATE:** MD
- **ZIP:** 21231

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** T. Rowe Price U.S. Bond Enhanced Index Fund, Inc.
- **DATE OF NAME CHANGE:** 20110509

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** T. Rowe Price U.S. Bond Index Fund, Inc.
- **DATE OF NAME CHANGE:** 20051028

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** T ROWE PRICE US BOND INDEX FUND INC
- **DATE OF NAME CHANGE:** 20000802

## Series and Classes Contracts Data

### T. Rowe Price QM U.S. Bond Index Fund (Series ID: S000002166)

| Class ID   | Class Name                                    | Ticker Symbol   |
|:---|:---|:---|
| C000005563 | T. Rowe Price QM U.S. Bond Index Fund         | PBDIX           |
| C000222342 | T. Rowe Price QM U.S. Bond Index Fund-Z Class | TSBZX           |
| C000222343 | T. Rowe Price QM U.S. Bond Index Fund-I Class | TSBLX           |

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| |
|:---|
| **T. Rowe Price QM U.S. Bond Index Fund** |
| Supplement to Prospectus and Summary Prospectus dated January 1, 2025, as supplemented |

---

The fund currently has the following investment policy:

Under normal conditions, the fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in bonds that are held in its benchmark index.

Effective January 1, 2026, this investment policy will be replaced with the following:

The fund normally invests at least 80% of its net assets (plus any borrowings for investment purposes) in U.S. bonds and in securities that are represented in the fund's benchmark index.

  <br> <u>The date of this supplement is October 16, 2025.</u> <br> F134-041 10/16/25