# EDGAR Filing Document

**Accession Number:** 0000076721
**File Stem:** 0001398344-26-005436
**Filing Date:** 2026-3
**Character Count:** 2903
**Document Hash:** 00ff7a4b46bfd6d3b237557a994f04a2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001398344-26-005436.hdr.sgml**: 20260319

**ACCESSION NUMBER**: 0001398344-26-005436

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260319

**DATE AS OF CHANGE**: 20260319

**EFFECTIVENESS DATE**: 20260319

**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:** 26775014

**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

## Series and Classes Contracts Data

### IMPAX GLOBAL SOCIAL LEADERS FUND (Series ID: S000083017)

---

|  |  |  |
|:---|:---|:---|
| Class Name          | Ticker Symbol | Class ID   |
| Investor Class      | IGSLX         | C000246501 |
| Institutional Class | IGSIX         | C000246502 |

---

## Series and Classes Contracts Data

### IMPAX GLOBAL SOCIAL LEADERS FUND (Series ID: S000083017)

| Class ID   | Class Name          | Ticker Symbol   |
|:---|:---|:---|
| C000246501 | Investor Class      | IGSLX           |
| C000246502 | Institutional Class | IGSIX           |

**Impax Funds Series Trust I**

**Impax Global Social Leaders Fund**

Supplement Dated March 19, 2026

to the Prospectus dated May 1, 2025

On March 11, 2026, Impax Funds Series Trust I's Board of Trustees approved a Plan of Liquidation and Termination (the "Plan") with respect to Impax Global Social Leaders Fund (the "Fund"), pursuant to which the Fund is expected to be liquidated and terminated on or about May 1, 2026 (the "Liquidation Date").

In anticipation of the Fund's liquidation, the Fund will cease the sale of shares to new shareholders upon the close of business on March 23, 2026; however, shares of the Fund may continue to be offered through intermediaries that currently have relationships with the Fund and to current shareholders having accounts directly with the Fund. Existing shareholders of the Fund may redeem or exchange shares of the Fund for Institutional Class or Investor Class shares of any other Impax Fund at any time prior to the Liquidation Date as described under "How to Exchange Shares" in the Fund's Prospectus.