# EDGAR Filing Document

**Accession Number:** 0000898745
**File Stem:** 0000898745-25-000662
**Filing Date:** 2025-11
**Character Count:** 5424
**Document Hash:** 1299e9ae36c3deae1b9da43c5c6a7068
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000898745-25-000662.hdr.sgml**: 20251119

**ACCESSION NUMBER**: 0000898745-25-000662

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 17

**FILED AS OF DATE**: 20251119

**DATE AS OF CHANGE**: 20251119

**EFFECTIVENESS DATE**: 20251119

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PRINCIPAL FUNDS, INC.
- **CENTRAL INDEX KEY:** 0000898745

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 1031

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-59474
- **FILM NUMBER:** 251497681

**BUSINESS ADDRESS:**
- **STREET 1:** 711 HIGH STREET
- **CITY:** DES MOINES
- **STATE:** IA
- **ZIP:** 50392
- **BUSINESS PHONE:** 515-235-9328

**MAIL ADDRESS:**
- **STREET 1:** PRINCIPAL FINANCIAL GROUP
- **CITY:** DES MOINES
- **STATE:** IA
- **ZIP:** 50392

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PRINCIPAL FUNDS, INC
- **DATE OF NAME CHANGE:** 20211220

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PRINCIPAL FUNDS INC
- **DATE OF NAME CHANGE:** 20080616

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PRINCIPAL INVESTORS FUND INC
- **DATE OF NAME CHANGE:** 20001012

## Series and Classes Contracts Data

### LargeCap S&P 500 Index Fund (Series ID: S000007016)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| R-3                 | PLFMX         | C000019169 |
| R-5                 | PLFPX         | C000019170 |
| Institutional Class | PLFIX         | C000019172 |
| Class J             | PSPJX         | C000019173 |
| Class A             | PLSAX         | C000019174 |

---

## Series and Classes Contracts Data

### LargeCap S&P 500 Index Fund (Series ID: S000007016)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000019169 | R-3                 | PLFMX           |
| C000019170 | R-5                 | PLFPX           |
| C000019172 | Institutional Class | PLFIX           |
| C000019173 | Class J             | PSPJX           |
| C000019174 | Class A             | PLSAX           |

?xml version='1.0' encoding='ASCII'? ck0000898745-20251119

**Principal Funds, Inc.**

**Supplement dated November 19, 2025**

**to the Prospectus and Statement of Additional Information** 

**both dated March 1, 2025**

**(as previously supplemented)**

This supplement updates information contained in the Prospectus and Statement of Additional Information. Please retain this supplement for future reference.

The changes described below are being made to the Prospectus.

**SUMMARY FOR LARGECAP S&P 500 INDEX FUND**

*Under* **Principal Investment Strategies***, add the following to the end of the fourth paragraph:* 

The Fund may operate as a non-diversified fund, as defined under the Investment Company Act of 1940 ("1940 Act"), to the approximate extent the Index is non-diversified. The Fund may therefore operate as non-diversified solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Index. A non-diversified fund can invest a higher percentage of assets in securities of individual issuers than a diversified fund. As a result, changes in the value of a single investment could cause greater fluctuations in the share price of a non-diversified fund than would occur in a more diversified fund.

*In the* **Principal Risks** *section*, *add the following* **Non-Diversification Risk** *alphabetically to the Fund's principal risks:*

**Non-Diversification Risk**. From time to time, the Fund may operate as a non-diversified fund under the 1940 Act, solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Fund's Index. A non-diversified fund may invest a high percentage of its assets in the securities of a small number of issuers and is more likely than diversified funds to be significantly affected by a specific security's poor performance.

The changes described below are being made to the Statement of Additional Information.

**DESCRIPTION OF THE FUNDS' INVESTMENTS AND RISKS**

*Under* **Fundamental Restrictions***, delete section 6)(b) and replace with the following:* 

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)It is anticipated that the LargeCap S&P 500 Index Fund will be diversified in approximately the same proportions as the respective index that the Fund uses to measure its performance. Because the LargeCap S&P 500 Index Fund seeks to track the performance of the securities included in its respective index, it is possible that LargeCap S&P 500 Index Fund may change from diversified to non-diversified as a result of a change in relative market capitalization or weighting of one or more constituents of the Fund's index. In such an instance, shareholder approval will not be sought when the LargeCap S&P 500 Index Fund crosses from diversified to non-diversified status due solely to a change in the relative market capitalization or index weightings of one or more constituents of the LargeCap S&P 500 Index Fund's index.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c)All other Funds have elected to be treated as a "diversified" investment company, as that term is used in the 1940 Act, as amended, and as interpreted, modified, or otherwise permitted by regulatory authority having jurisdiction, from time to time.