# EDGAR Filing Document

**Accession Number:** 0001761055
**File Stem:** 0001193125-25-202364
**Filing Date:** 2025-9
**Character Count:** 3044
**Document Hash:** 7c03c77a4733eabb6c17153db7a3be5d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-202364.hdr.sgml**: 20250912

**ACCESSION NUMBER**: 0001193125-25-202364

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250912

**DATE AS OF CHANGE**: 20250912

**EFFECTIVENESS DATE**: 20250912

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BlackRock ETF Trust
- **CENTRAL INDEX KEY:** 0001761055

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 0731

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-228832
- **FILM NUMBER:** 251312398

**BUSINESS ADDRESS:**
- **STREET 1:** 100 BELLEVUE PARKWAY
- **CITY:** WILMINGTON
- **STATE:** DE
- **ZIP:** 19809
- **BUSINESS PHONE:** 8004417762

**MAIL ADDRESS:**
- **STREET 1:** 100 BELLEVUE PARKWAY
- **CITY:** WILMINGTON
- **STATE:** DE
- **ZIP:** 19809

## Series and Classes Contracts Data

### BlackRock U.S. Carbon Transition Readiness ETF (Series ID: S000071281)

---

|  |  |
|:---|:---|
| Class Name                                     | Class ID   |
| BlackRock U.S. Carbon Transition Readiness ETF | C000226201 |

---

### BlackRock World ex U.S. Carbon Transition Readiness ETF (Series ID: S000071282)

---

|  |  |
|:---|:---|
| Class Name                                              | Class ID   |
| BlackRock World ex U.S. Carbon Transition Readiness ETF | C000226202 |

---

## Series and Classes Contracts Data

### BlackRock U.S. Carbon Transition Readiness ETF (Series ID: S000071281)

| Class ID   | Class Name                                     | Ticker Symbol   |
|:---|:---|:---|
| C000226201 | BlackRock U.S. Carbon Transition Readiness ETF |  |

### BlackRock World ex U.S. Carbon Transition Readiness ETF (Series ID: S000071282)

| Class ID   | Class Name                                              | Ticker Symbol   |
|:---|:---|:---|
| C000226202 | BlackRock World ex U.S. Carbon Transition Readiness ETF |  |

**BLACKROCK ETF TRUST** 

BlackRock U.S. Carbon Transition Readiness ETF

BlackRock World ex U.S. Carbon Transition Readiness ETF

(each, a "Fund" and collectively, the "Funds")

**Supplement dated September 12, 2025 to the Statement of Additional Information ("SAI") of the Funds, dated November 27, 2024, as amended or supplemented to date** 

**Effective immediately, the Funds' SAI is amended as follows:** 

The chart listing investments and investment strategies in the section entitled "Investment Objective and Policies" is amended to reflect that the Funds may invest in spot transactions and FX forwards, as follows:

---

| | | | | |
|:---|:---|:---|:---|:---|
| | **U.S. CTR** | **U.S. CTR** | **World ex U.S.<br>CTR** | **World ex U.S.<br>CTR** |
| Derivatives | | X | | X |
| &nbsp;&nbsp;&nbsp;&nbsp; <u>Foreign Exchange Transactions</u> | | X | | X |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Spot Transactions and FX Forwards | | X | | X |

---

**Shareholders should retain this Supplement for future reference.** 

SAI-CARB-0924SUP