# EDGAR Filing Document

**Accession Number:** 0001804196
**File Stem:** 0001193125-26-094070
**Filing Date:** 2026-3
**Character Count:** 2003
**Document Hash:** 529daeea140aa2f71a21683713fa013e
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-094070.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0001193125-26-094070

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**EFFECTIVENESS DATE**: 20260305

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BlackRock ETF Trust II
- **CENTRAL INDEX KEY:** 0001804196

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

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-236575
- **FILM NUMBER:** 26726637

**BUSINESS ADDRESS:**
- **STREET 1:** 100 BELLEVUE PARKWAY
- **CITY:** WILMINGTON
- **STATE:** DE
- **ZIP:** 19809
- **BUSINESS PHONE:** 800 882 0052

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

## Series and Classes Contracts Data

### iShares Mortgage-Backed Securities Active ETF (Series ID: S000093898)

---

|  |  |
|:---|:---|
| Class Name                                    | Class ID   |
| iShares Mortgage-Backed Securities Active ETF | C000262359 |

---

## Series and Classes Contracts Data

### iShares Mortgage-Backed Securities Active ETF (Series ID: S000093898)

| Class ID   | Class Name                                    | Ticker Symbol   |
|:---|:---|:---|
| C000262359 | iShares Mortgage-Backed Securities Active ETF |  |

**BLACKROCK ETF TRUST II** 

iShares Mortgage-Backed Securities Active ETF

(the "Fund")

**Supplement dated March 5, 2026 to the Prospectus and Statement of Additional Information of the Fund, each dated January 26, 2026, as supplemented to date** 

Effective as of April 30, 2026, the Fund's fiscal year end is changed from September 30 to April 30. The change will be reflected in the Fund's reports on Form N-CSR for the period of October 1, 2025 to April 30, 2026.

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

PRSAI-MBBA-0326SUP