# EDGAR Filing Document

**Accession Number:** 0001598735
**File Stem:** 0001398344-26-009954
**Filing Date:** 2026-5
**Character Count:** 9556
**Document Hash:** 383eff5cbda54d603f88a49b1eedf927
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-26-009954.hdr.sgml**: 20260529

**ACCESSION NUMBER**: 0001398344-26-009954

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260529

**DATE AS OF CHANGE**: 20260529

**EFFECTIVENESS DATE**: 20260529

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IMPAX FUNDS SERIES TRUST I
- **CENTRAL INDEX KEY:** 0000076721

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-38679
- **FILM NUMBER:** 261039349

**BUSINESS ADDRESS:**
- **STREET 1:** 30 PENHALLOW STREET, SUITE 400
- **CITY:** PORTSMOUTH
- **STATE:** NH
- **ZIP:** 03801-3852
- **BUSINESS PHONE:** 800-767-1729

**MAIL ADDRESS:**
- **STREET 1:** 30 PENHALLOW STREET, SUITE 400
- **CITY:** PORTSMOUTH
- **STATE:** NH
- **ZIP:** 03801-3852

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PAX WORLD FUNDS SERIES TRUST I
- **DATE OF NAME CHANGE:** 20070831

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PAX WORLD BALANCED FUND
- **DATE OF NAME CHANGE:** 20061113

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PAX WORLD BALANCED FUND INC
- **DATE OF NAME CHANGE:** 20040624
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** IMPAX FUNDS SERIES TRUST III
- **CENTRAL INDEX KEY:** 0001598735

**ORGANIZATION NAME:**
- **EIN:** 261109604
- **STATE OF INCORPORATION:** MA
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-194601
- **FILM NUMBER:** 261039350

**BUSINESS ADDRESS:**
- **STREET 1:** 30 PENHALLOW STREET, SUITE 400
- **CITY:** PORTSMOUTH
- **STATE:** NH
- **ZIP:** 03801
- **BUSINESS PHONE:** 603-431-8022

**MAIL ADDRESS:**
- **STREET 1:** 30 PENHALLOW STREET, SUITE 400
- **CITY:** PORTSMOUTH
- **STATE:** NH
- **ZIP:** 03801

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PAX WORLD FUNDS SERIES TRUST III
- **DATE OF NAME CHANGE:** 20140130

## Series and Classes Contracts Data

### Impax US Sustainable Economy Fund (Series ID: S000015763)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Investor Class      | PXWGX         | C000043241 |
| Institutional Class | PWGIX         | C000043242 |
| Class A             | PXGAX         | C000128848 |

---

### Impax International Sustainable Economy Fund (Series ID: S000044216)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | PXNIX         | C000137561 |
| Investor Class      | PXINX         | C000137562 |

---

### Impax Global Women's Leadership Fund (Series ID: S000045528)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Institutional Class | PXWIX         | C000141747 |
| Investor Class      | PXWEX         | C000141748 |

---

## Series and Classes Contracts Data

### Impax US Sustainable Economy Fund (Series ID: S000015763)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000043241 | Investor Class      | PXWGX           |
| C000043242 | Institutional Class | PWGIX           |
| C000128848 | Class A             | PXGAX           |

### Impax International Sustainable Economy Fund (Series ID: S000044216)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000137561 | Institutional Class | PXNIX           |
| C000137562 | Investor Class      | PXINX           |

### Impax Global Women's Leadership Fund (Series ID: S000045528)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000141747 | Institutional Class | PXWIX           |
| C000141748 | Investor Class      | PXWEX           |

**Impax Funds Series Trust I**

**Impax US Sustainable Economy Fund, Impax Global Women's Leadership Fund, <br> Impax International Sustainable Economy Fund**

Supplement dated May 29, 2026

to the Prospectus and Statement of Additional Information,

each dated May 1, 2026

Effective June 1, 2026, the Prospectus and Statement of Additional Information are amended, as follows:

**Prospectus**

**Page 30**

Under **Portfolio Managers**, the table of Portfolio Managers for Impax US Sustainable Economy Fund is deleted and replaced in its entirety with the following:

<u>Portfolio Manager</u> <u>Since</u> <u>Title</u> <br> Scott LaBreche 2021 Portfolio Manager <br> Robb Ruhr 2026 Portfolio Manager

**Page 53**

Under **Portfolio Managers**, the table of Portfolio Managers for Impax Global Women's Leadership Fund is deleted and replaced in its entirety with the following:

<u>Portfolio Manager</u> <u>Since</u> <u>Title</u> <br> Scott LaBreche 2014 Portfolio Manager <br> Robb Ruhr 2026 Portfolio Manager

**Page 60**

Under **Portfolio Managers**, the table of Portfolio Managers for Impax International Sustainable Economy Fund is deleted and replaced in its entirety with the following:

<u>Portfolio Manager</u> <u>Since</u> <u>Title</u> <br> Scott LaBreche 2015 Portfolio Manager <br> Robb Ruhr 2026 Portfolio Manager

**Page 126**

The description of **Christine Cappabianca** under **Portfolio Managers** is deleted in its entirety.

**Page 128**

The following description of **Robb Ruhr** is added immediately above the description of Peter Schwab under **Portfolio Managers**:

**Robb Ruhr, CFA** is a Portfolio Manager of the US Sustainable Economy Fund, the Global Women's Fund and the International Sustainable Economy Fund. Mr. Ruhr joined Impax in 2022, where he initially led the Portfolio Specialist team and worked closely with the firm's portfolio management and portfolio construction teams. Prior to joining Impax, Mr. Ruhr was a senior portfolio specialist in the systematic group at Allspring Global Investments (formerly Wells Fargo Asset Management), where he was responsible for representing the systematic investment team on equity and alternative products with investors and consultants globally. Mr. Ruhr began his career at UBS AG, where he held roles in interest rate and equity trading groups in London and Stamford, CT. He then moved to GE Asset Management where he served as an equity portfolio analyst in the listed equity team, an asset allocation analyst for the GE Pension, and also held roles in client service and business development. He holds a bachelor's degree in economics from the University of Calgary and is a CFA<sup>®</sup> Charterholder.

**Statement of Additional Information**

**Page 92**

The table summarizing information regarding other accounts managed by the portfolio managers of the Funds, other than the Funds themselves, is replaced in its entirety with the following:

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| **Portfolio Manager** | **Number of Other Pooled Vehicles Managed** | **Other Pooled Vehicles AUM $(million)** | **Number of Other Accounts Managed** | **Other Accounts AUM $(million)** | **Number of Other Registered Investment Companies Managed** | **Assets of Other Registered Investment Companies AUM $(million)** |
| Joseph Cordi | 2 | $7.90 | 1 | $33.89 | 0 | $0 |
| Amber Fairbanks | 4 | $196.21 | 1 | $33.89 | 0 | $0 |
| Curtis Kim | 1 | $5.51 | 0 | $0 | 0 | $0 |
| Scott LaBreche | 0 | $0 | 0 | $0 | 0 | $0 |
| Kirsteen Morrison | 0 | $0 | 0 | $0 | 0 | $0 |
| Nathan Moser | 1 | $5.51 | 0 | $0 | 0 | $0 |
| Ross Pamphilon | 0 | $0 | 0 | $0 | 0 | $0 |
| Robb Ruhr<sup>1</sup> | 0 | $0 | 0 | $0 | 0 | $0 |
| Peter Schwab | 0 | $0 | 1 | $91.51 | 0 | $0 |
| Anthony Trczinka | 0 | $0 | 1 | $91.51 | 0 | $0 |

---

<sup>1</sup> Information for Mr. Ruhr is provided as of May 28, 2026.

**Page 95**

The section entitled **Portfolio Managers–Ownership of Securities** is replaced in its entirety with the following:

Unless otherwise stated, as of December 31, 2025 (i) the dollar value of shares of the Large Cap Fund owned beneficially by Joseph Cordi was $50,001- $100,000; and by Amber Fairbanks was $100,001- $500,000; (ii) the dollar value of shares of the Small Cap Fund owned beneficially by Curtis Kim was $10,001-$50,000; and by Nathan Moser was $100,001- $500,000; (iii) the dollar value of shares of the US Sustainable Economy Fund owned beneficially by Scott LaBreche was $100,001-$500,000; and by Robb Ruhr was $0<sup>1</sup>; (iv) the dollar value of shares of the International Sustainable Economy Fund owned beneficially by Scott LaBreche was $100,001-$500,000; and by Robb Ruhr was $0<sup>1</sup>; (v) the dollar value of shares of the Global Women's Fund owned beneficially by Scott LaBreche was $50,001-$100,000; and by Robb Ruhr was $0<sup>1</sup>; (vi) the dollar value of shares of the Global Environmental Markets Fund owned beneficially by Luciano Lilloy was $0; by Fotis Chatzimichalakis was $0; and by Sanjeev Lakhani was $0; (vii) the dollar value of shares of the Global Opportunities Fund owned beneficially by Kirsteen Morrison was $0; and by Amber Fairbanks was $0; (viii) the dollar value of shares of the Core Bond Fund owned beneficially by Anthony Trzcinka was $10,001-$50,000; and by Ross Pamphilon was $0; (ix) the dollar value of shares of the High Yield Bond Fund owned beneficially by Peter Schwab was $500,001- $1,000,000; (x) the dollar value of shares of the Sustainable Allocation Fund owned beneficially by Nathan Moser was $100,001-$500,000; by Peter Schwab was $100,001-$500,000; by Anthony Trzcinka was $100,001-$500,000; and by Kirsteen Morrison was $0.

<sup>1</sup> Information for Mr. Ruhr is provided as of May 28, 2026.