# EDGAR Filing Document

**Accession Number:** 0000879947
**File Stem:** 0001193125-25-196981
**Filing Date:** 2025-9
**Character Count:** 8097
**Document Hash:** 76fef16dfdc3320867a9b3f44e53a8d7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-196981.hdr.sgml**: 20250905

**ACCESSION NUMBER**: 0001193125-25-196981

**CONFORMED SUBMISSION TYPE**: 485BXT

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250905

**DATE AS OF CHANGE**: 20250905

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMG ETF Trust
- **CENTRAL INDEX KEY:** 0000879947

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

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1940 Act
- **SEC FILE NUMBER:** 811-06431
- **FILM NUMBER:** 251295817

**BUSINESS ADDRESS:**
- **STREET 1:** 680 WASHINGTON BOULEVARD, SUITE 500
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901
- **BUSINESS PHONE:** 2032993500

**MAIL ADDRESS:**
- **STREET 1:** 680 WASHINGTON BOULEVARD, SUITE 500
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AMG Funds II
- **DATE OF NAME CHANGE:** 20140422

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MANAGERS TRUST II
- **DATE OF NAME CHANGE:** 20000801

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SMITH BREEDEN SERIES FUND
- **DATE OF NAME CHANGE:** 19920929
**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** AMG ETF Trust
- **CENTRAL INDEX KEY:** 0000879947

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

**FILING VALUES:**
- **FORM TYPE:** 485BXT
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-43089
- **FILM NUMBER:** 251295816

**BUSINESS ADDRESS:**
- **STREET 1:** 680 WASHINGTON BOULEVARD, SUITE 500
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901
- **BUSINESS PHONE:** 2032993500

**MAIL ADDRESS:**
- **STREET 1:** 680 WASHINGTON BOULEVARD, SUITE 500
- **CITY:** STAMFORD
- **STATE:** CT
- **ZIP:** 06901

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AMG Funds II
- **DATE OF NAME CHANGE:** 20140422

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MANAGERS TRUST II
- **DATE OF NAME CHANGE:** 20000801

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** SMITH BREEDEN SERIES FUND
- **DATE OF NAME CHANGE:** 19920929

## Series and Classes Contracts Data

### AMG GW&K Muni Income ETF (Series ID: S000095116)

| Class ID   | Class Name               | Ticker Symbol   |
|:---|:---|:---|
| C000263709 | AMG GW&K Muni Income ETF |  |

**As filed with the Securities and Exchange Commission on September 5, 2025** 

**1933 Act Registration No. 033-43089** 

**1940 Act Registration No. 811-06431** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM N-1A** 

**REGISTRATION STATEMENT** 

***UNDER***

---

| | |
|:---|:---|
| ***THE SECURITIES ACT OF 1933*** | ☒ |
| **Pre-Effective Amendment No.** | ☐ |
| **Post-Effective Amendment No. 87** | ☒ |

---

**REGISTRATION STATEMENT** 

***UNDER***

---

| | |
|:---|:---|
| ***THE INVESTMENT COMPANY ACT OF 1940*** | ☒ |
| **Amendment No. 89** | ☒ |

---

## AMG ETF TRUST
**(Exact name of registrant as specified in charter)** 

**680 Washington Boulevard, Suite 500** 

**Stamford, Connecticut 06901** 

**(Address of principal executive offices)** 

**Registrant's telephone number, including area code: (844) 545-1258** 

**Gregory C. Davis** 

**Ropes & Gray LLP** 

**Three Embarcadero Center** 

**San Francisco, CA 94111-4006** 

**(Name and address of agent for service)** 

It is proposed that this filing will become effective:

☐ immediately upon filing pursuant to paragraph (b)

☒ on September 15, 2025 pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)

☐ on (date) pursuant to paragraph (a)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ on (date) pursuant to (a)(2) of rule 485

If appropriate, check the following box:

☒ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment No. 87 is being filed pursuant to Rule 485(b) under the Securities Act of 1933, as amended, solely to designate September 15, 2025 as the new effective date for the Registration Statement of AMG GW&K Muni Income ETF, a series of AMG ETF Trust, filed in [Post-Effective Amendment No. 86](http://www.sec.gov/Archives/edgar/data/879947/000119312525145354/d45359d485apos.htm) on June 24, 2025 pursuant to Rule 485(a) under the 1933 Act. Unless otherwise indicated herein, this Post-Effective Amendment No. 87 does not supersede or amend any disclosure contained in Post-Effective Amendment No. 86.

------

**AMG ETF TRUST** 

**AMG GW&K MUNI INCOME ETF** 

**Part A. INFORMATION REQUIRED IN A PROSPECTUS** 

Part A is incorporated by reference to [Part A of Post-Effective Amendment No. 86](http://www.sec.gov/Archives/edgar/data/879947/000119312525145354/d45359d485apos.htm) to the Registration Statement on Form N-1A of AMG ETF Trust (the "Trust") under the Securities Act of 1933, as amended, and Amendment No. 88 to the Trust's Registration Statement on Form N-1A under the Investment Company Act of 1940, as amended, filed with the Securities and Exchange Commission (the "SEC") on June 24, 2025 ("Amendment No. 86/88").

**Part B. INFORMATION REQUIRED IN A STATEMENT OF ADDITIONAL INFORMATION** 

Part B is incorporated by reference to [Part B of Amendment No. 86/88](http://www.sec.gov/Archives/edgar/data/879947/000119312525145354/d45359d485apos.htm) to the Trust's Registration Statement on Form N-1A filed with the SEC on June 24, 2025.

**Part C. OTHER INFORMATION** 

Part C is incorporated by reference to [Part C of Amendment No. 86/88](http://www.sec.gov/Archives/edgar/data/879947/000119312525145354/d45359d485apos.htm) to the Trust's Registration Statement on Form N-1A filed with the SEC on June 24, 2025.

------

**SIGNATURES** 

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, each as amended, AMG ETF Trust certifies that it meets all of the requirements for effectiveness of this registration statement under Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this amendment to the registration statement to be signed on its behalf by the undersigned, duly authorized, in the City of Stamford, and State of Connecticut, on the 5th day of September, 2025.

---

| | |
|:---|:---|
| AMG ETF Trust | AMG ETF Trust |
| By: | /s/ Thomas Disbrow |
|  | Thomas Disbrow |
|  | Treasurer, Chief Financial Officer, and |
|  | Principal Financial Officer |

---

Pursuant to the requirements of the Securities Act, this amendment to the registration statement has been signed below by the following persons in the capacities and on the date indicated:

---

| | | |
|:---|:---|:---|
| Signature | Title | Date |
| /s/ Jill R. Cuniff\*<br> Jill R. Cuniff | Trustee | September 5, 2025 |
| /s/ Kurt A. Keilhacker\*<br> Kurt A. Keilhacker | Trustee | September 5, 2025 |
| /s/ Peter W. MacEwen\*<br> Peter W. MacEwen | Trustee | September 5, 2025 |
| /s/ Steven J. Paggioli\*<br> Steven J. Paggioli | Trustee | September 5, 2025 |
| /s/ Eric Rakowski\*<br> Eric Rakowski | Trustee | September 5, 2025 |
| /s/ Victoria L. Sassine\*<br> Victoria L. Sassine | Trustee | September 5, 2025 |
| /s/ Garret W. Weston\*<br> Garret W. Weston | Trustee | September 5, 2025 |
| /s/ Keitha L. Kinne<br> Keitha L. Kinne | President and<br> Principal Executive Officer<br> (Principal Executive Officer) | September 5, 2025 |
| /s/ Thomas Disbrow<br> Thomas Disbrow | Treasurer,<br> Chief Financial Officer, and<br> Principal Financial Officer<br> (Principal Accounting Officer)<br> (Principal Financial Officer) | September 5, 2025 |

---

---

| | |
|:---|:---|
| \*By: | /s/ Thomas Disbrow |
|  | Thomas Disbrow |

---

\* Pursuant to the [Power of Attorney for Trustees and certain Officers incorporated herein by reference to Post-Effective Amendment No. 86 to the Registrant's Registration Statement on Form N-1A, Registration Nos. 033-43089 and 811-06431 (filed June 24, 2025).](http://www.sec.gov/Archives/edgar/data/879947/000119312525145354/d45359dex99j2.htm) 

Date: September 5, 2025