# EDGAR Filing Document

**Accession Number:** 0001424212
**File Stem:** 0001445546-26-004350
**Filing Date:** 2026-6
**Character Count:** 2260
**Document Hash:** 87e427439a99e8a976577dd765f2578a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001445546-26-004350.hdr.sgml**: 20260612

**ACCESSION NUMBER**: 0001445546-26-004350

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260612

**DATE AS OF CHANGE**: 20260612

**EFFECTIVENESS DATE**: 20260612

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** FIRST TRUST EXCHANGE-TRADED FUND III
- **CENTRAL INDEX KEY:** 0001424212

**ORGANIZATION NAME:**
- **EIN:** 000000000

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-176976
- **FILM NUMBER:** 261085344

**BUSINESS ADDRESS:**
- **STREET 1:** 120 EAST LIBERTY DRIVE
- **STREET 2:** SUITE 400
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187
- **BUSINESS PHONE:** 630-765-8000

**MAIL ADDRESS:**
- **STREET 1:** 120 EAST LIBERTY DRIVE
- **STREET 2:** SUITE 400
- **CITY:** WHEATON
- **STATE:** IL
- **ZIP:** 60187

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** First Trust Exchange-Traded Fund III
- **DATE OF NAME CHANGE:** 20160419

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** First Trust Exchange Traded Fund III
- **DATE OF NAME CHANGE:** 20080116

## Series and Classes Contracts Data

### First Trust Merger Arbitrage ETF (Series ID: S000067481)

---

|  |  |  |
|:---|:---|:---|
| Class Name                       | Ticker Symbol | Class ID   |
| First Trust Merger Arbitrage ETF | MARB          | C000216993 |

---

## Series and Classes Contracts Data

### First Trust Merger Arbitrage ETF (Series ID: S000067481)

| Class ID   | Class Name                       | Ticker Symbol   |
|:---|:---|:---|
| C000216993 | First Trust Merger Arbitrage ETF | MARB            |

Rule 497(e)<br> Registration Nos. 333-176976 and 811-22245

First Trust Exchange-Traded Fund III

(the *"Trust"*)

FIRST TRUST MERGER ARBITRAGE ETF

(the *"Fund"*)

Supplement To the Fund's Prospectus, Summary Prospectus<br> and Statement of Additional Information

June 12, 2026

The changes to the Fund's investment strategies, name and other related matters, previously announced on January 27, 2026, are expected to occur on or around June 23, 2026.

Please Keep this Supplement with your Fund Prospectus, Summary Prospectus

and Statement of Additional Information for Future Reference