# EDGAR Filing Document

**Accession Number:** 0000893818
**File Stem:** 0001193125-23-076653
**Filing Date:** 2023-3
**Character Count:** 2319
**Document Hash:** 84825377509a9e90593e45966fc7ce68
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-076653.hdr.sgml**: 20230322

**ACCESSION NUMBER**: 0001193125-23-076653

**CONFORMED SUBMISSION TYPE**: 497K

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230322

**DATE AS OF CHANGE**: 20230322

**EFFECTIVENESS DATE**: 20230322

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** BlackRock Funds III
- **CENTRAL INDEX KEY:** 0000893818
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497K
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-54126
- **FILM NUMBER:** 23752847

**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: Institutional (Series ID: S000004275)

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

**BlackRock Funds III** 

BlackRock Cash Funds: Institutional

BlackRock Cash Funds: Treasury

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

**Supplement dated March 22, 2023 to the Summary Prospectuses, Prospectuses and Statements of Additional Information of each Fund, each dated April 29, 2022, as supplemented to date** 

**Effective immediately, any references to a Fund's P.O. Box are deleted and replaced with:** 

State Street Bank and Trust Company

Attn: Quincy Nunnally-Transfer Agency

P.O. Box 5493

Boston, Massachusetts 02206

**Effective immediately, any references to a Fund's overnight mailing address are deleted and replaced with:** 

State Street Bank and Trust Company

Attn: Quincy Nunnally-Transfer Agency

1776 Heritage Drive

JAB/3

North Quincy, Massachusetts 02171

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

PR2SAI-BCF-0323SUP