# EDGAR Filing Document

**Accession Number:** 0001540305
**File Stem:** 0000894189-25-006967
**Filing Date:** 2025-9
**Character Count:** 4896
**Document Hash:** 70e42a8867839205bcfdb49be978b8d9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000894189-25-006967.hdr.sgml**: 20250915

**ACCESSION NUMBER**: 0000894189-25-006967

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 16

**FILED AS OF DATE**: 20250915

**DATE AS OF CHANGE**: 20250915

**EFFECTIVENESS DATE**: 20250915

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ETF Series Solutions
- **CENTRAL INDEX KEY:** 0001540305

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1112

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-179562
- **FILM NUMBER:** 251314813

**BUSINESS ADDRESS:**
- **STREET 1:** 615 EAST MICHIGAN ST
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202
- **BUSINESS PHONE:** 414-287-3700

**MAIL ADDRESS:**
- **STREET 1:** 615 EAST MICHIGAN ST
- **CITY:** MILWAUKEE
- **STATE:** WI
- **ZIP:** 53202

## Series and Classes Contracts Data

### AAM Transformers ETF (Series ID: S000076555)

---

|  |  |  |
|:---|:---|:---|
| Class Name           | Ticker Symbol | Class ID   |
| AAM Transformers ETF | TRFM          | C000236534 |

---

## Series and Classes Contracts Data

### AAM Transformers ETF (Series ID: S000076555)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000236534 | AAM Transformers ETF | TRFM            |

?xml version='1.0' encoding='ASCII'? ck0001540305-20250915

Filed Pursuant to Rule 497(e)

Registration Nos. 333-179562; 811-22668

**AAM Transformers ETF (TRFM)**

(the "Fund")

**September 15, 2025**

**Supplement to the Summary Prospectus and Prospectus** 

**dated February 28, 2025**

Effective September 19, 2025 the following updates are made to the Fund's Prospectus:

*The following replaces the paragraph that precedes the Sub-Industries chart in the Principal Investment Strategy:* 

Securities eligible for inclusion in the Index must be classified in one of the following sub-industries of the Global Industry Classification Standard ("GICS"). The sub-industries eligible for inclusion in the Index are subject to change upon each quarterly rebalance of the Index.

*The Sub-Industries chart in the Principal Investment Strategy is hereby replaced with the following:*

---

| | | |
|:---|:---|:---|
| **Sub-Industries** | **Sub-Industries** | **Sub-Industries** |
| Aerospace & Defense | Electronic Components | Renewable Electricity |
| Application Software | Electronic Equipment & Instrument | Restaurants |
| Automobile Manufacturers | Electronic Manufacturing Services | Semiconductor Materials & Equipment |
| Automotive Parts & Equipment | Heavy Electrical Equipment | Semiconductors |
| Broadline Retail | Hotels, Resorts & Cruise Lines | Specialized Consumer Services |
| Cargo Ground Transportation | Independent Power Producers & Energy Traders | Specialty Chemicals |
| Communications Equipment | Industrial Machinery & Suppliers | Systems Software |
| Consumer Electronics | Interactive Home Entertainment | Technology Distributors |
| Copper | Interactive Media & Services | Technology Hardware, Storage & Peripherals |
| Data Processing & Outsourced Services | Internet Services & Infrastructure | Transaction & Payment Processing Services |
| Electric Utilities | IT Consulting & Other Services | |
| Electrical Components & Equipment | Passenger Ground Transportation | |

---

------

*The following replaces the third paragraph under the Sub-Industries chart in the Principal Investment Strategy:* 

The Index is reconstituted (i.e., Index constituents are added or deleted and weightings within each category are reset to equal-weight) after the close of business on the third Friday of March, June, September, and December. At the time of each reconstitution of the Index, Index constituents are added or deleted based on company data as of the last business day of February, May, August, and November, respectively, and the Index constituents are equally weighted within the following categories based on closing prices as of ten business days prior to the reconstitution date. Category classifications that are used to determine constituent weights are analyzed upon quarterly rebalances and are subject to change upon each quarterly rebalance.

---

| | |
|:---|:---|
| **Category 1 (20% weight)** | U.S.-based companies with over $150 billion market capitalization |
| **Category 2 (30% weight)** | U.S.-based companies with $20 billion to $150 billion market capitalization |
| **Category 3 (25% weight)** | U.S.-based companies with $2 billion to $20 billion market capitalization |
| **Category 4 (15% weight)** | international companies with over $30 billion market capitalization |
| **Category 5 (10% weight)** | international companies with $2 billion to $30 billion market capitalization |

---

**Please retain this Supplement with your Summary Prospectus and Prospectus for future reference.**