# EDGAR Filing Document

**Accession Number:** 0001169187
**File Stem:** 0001999371-25-011622
**Filing Date:** 2025-8
**Character Count:** 2653
**Document Hash:** e4d169de7e32198886bcd23d391265ac
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001999371-25-011622.hdr.sgml**: 20250819

**ACCESSION NUMBER**: 0001999371-25-011622

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250819

**DATE AS OF CHANGE**: 20250819

**EFFECTIVENESS DATE**: 20250819

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** T. Rowe Price Institutional Income Funds, Inc.
- **CENTRAL INDEX KEY:** 0001169187

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0531

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-84634
- **FILM NUMBER:** 251229717

**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 INSTITUTIONAL INCOME FUNDS INC
- **DATE OF NAME CHANGE:** 20020314

## Series and Classes Contracts Data

### T. Rowe Price Institutional Long Duration Credit Fund (Series ID: S000040861)

| Class ID   | Class Name                                            | Ticker Symbol   |
|:---|:---|:---|
| C000126665 | T. Rowe Price Institutional Long Duration Credit Fund | RPLCX           |

**T. Rowe Price QM U.S. Bond Index Fund<br> T. Rowe Price QM U.S. Bond ETF**

Supplement to Prospectuses and Summary Prospectuses dated January 1, 2025

**T. Rowe Price Inflation Protected Bond Fund<br> T. Rowe Price Institutional Long Duration Credit Fund<br> T. Rowe Price Limited Duration Inflation Focused Bond Fund<br> T. Rowe Price U.S. Limited Duration TIPS Index Fund<br> T. Rowe Price U.S. Treasury Intermediate Index Fund<br> T. Rowe Price U.S. Treasury Long-Term Index Fund**

Supplement to Prospectuses and Summary Prospectuses dated August 1, 2025

In the Summary Prospectus and Section 1 of the Prospectus, the portfolio manager table under "Management" is supplemented as follows:

Effective December 31, 2025, Amit Deshpande will step down as one of the fund's co-portfolio managers and one of the cochairs of the fund's Investment Advisory Committee.

In Section 2 of the Prospectus, the disclosure under "Portfolio Management" is supplemented as follows:

Effective December 31, 2025, Amit Deshpande will be leaving the Firm and will step down from his role on the fund. Robert M. Larkins and Yongheon Lee will continue as the fund's co-portfolio managers and cochairs of the fund's Investment Advisory Committee.

The date of this supplement is August 19, 2025.

G69-041 8/19/25