# EDGAR Filing Document

**Accession Number:** 0000893818
**File Stem:** 0001193125-26-200139
**Filing Date:** 2026-5
**Character Count:** 3295
**Document Hash:** c55b270b95391a43d121999e4aae13f9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-200139.hdr.sgml**: 20260501

**ACCESSION NUMBER**: 0001193125-26-200139

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20260501

**DATE AS OF CHANGE**: 20260501

**EFFECTIVENESS DATE**: 20260501

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BlackRock Funds III
- **CENTRAL INDEX KEY:** 0000893818

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-54126
- **FILM NUMBER:** 26930098

**BUSINESS ADDRESS:**
- **STREET 1:** 400 HOWARD STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94105
- **BUSINESS PHONE:** 8006439691

**MAIL ADDRESS:**
- **STREET 1:** 400 HOWARD STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94105

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BARCLAYS GLOBAL INVESTORS FUNDS
- **DATE OF NAME CHANGE:** 20060201

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** BARCLAYS GLOBAL INVESTORS FUNDS INC
- **DATE OF NAME CHANGE:** 19990804

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MASTERWORKS FUNDS INC
- **DATE OF NAME CHANGE:** 19960607

## Series and Classes Contracts Data

### BlackRock Cash Funds: Treasury (Series ID: S000004273)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000011980 | Institutional Shares | BRIXX           |
| C000011981 | Premium Shares Class | BSPXX           |
| C000011982 | Select Shares Class  | BRSXX           |
| C000011983 | Trust Shares Class   | BYTXX           |
| C000060669 | Capital Shares       | BCYXX           |
| C000074117 | SL Agency Shares     |  |

### BlackRock Cash Funds: Institutional (Series ID: S000004275)

| Class ID   | Class Name       | Ticker Symbol   |
|:---|:---|:---|
| C000074119 | SL Agency Shares |  |

May 1, 2026

**VIA ELECTRONIC FILING** 

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Attention: Division of Investment Management

RE: BlackRock Cash Funds: Institutional and BlackRock Cash Funds: Treasury, each a series of

BlackRock Funds III

Post-Effective Amendment No. 408 to the Registration Statement on Form N-1A

<u>(Securities Act File No. 33-54126, Investment Company Act File No. 811-07332)</u>

Ladies and Gentlemen:

Pursuant to Rule 497(j) under the Securities Act of 1933, as amended (the "1933 Act"), BlackRock Funds III (the "Registrant"), on behalf of its series BlackRock Cash Funds: Institutional and BlackRock Cash Funds: Treasury (the "Funds"), hereby certifies that:

(1) the forms of Prospectuses and Statements of Additional Information that would have been filed pursuant to Rule 497(c) under the 1933 Act would not have differed from those contained in Post-Effective Amendment No. 408 to the Registration Statement on Form N-1A of the Registrant with respect to the Funds; and

(2) the text of Post-Effective Amendment No. 408 to the Registration Statement on Form N-1A of the Registrant with respect to the Funds was filed electronically with the Securities and Exchange Commission on April 27, 2026.

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| |
|:---|
| Sincerely, |
| BlackRock Funds III |
| /s/ Janey Ahn |
| Janey Ahn |
| Secretary of the Registrant |

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