# EDGAR Filing Document

**Accession Number:** 0000893818
**File Stem:** 0001193125-23-027145
**Filing Date:** 2023-2
**Character Count:** 7618
**Document Hash:** 1923df4debe5fb926fb7845613668ffc
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-027145.hdr.sgml**: 20230208

**ACCESSION NUMBER**: 0001193125-23-027145

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230208

**DATE AS OF CHANGE**: 20230207

**EFFECTIVENESS DATE**: 20230208

**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:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 033-54126
- **FILM NUMBER:** 23596283

**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

### iShares Russell 1000 Large-Cap Index Fund (Series ID: S000031723)

---

|  |  |
|:---|:---|
| Class Name           | Class ID   |
| Investor A Shares    | C000098723 |
| Institutional Shares | C000098724 |
| Class K shares       | C000098725 |

---

### iShares MSCI Total International Index Fund (Series ID: S000033188)

---

|  |  |
|:---|:---|
| Class Name           | Class ID   |
| Investor A Shares    | C000102140 |
| Institutional Shares | C000102141 |
| Class K shares       | C000102142 |

---

## Series and Classes Contracts Data

### iShares Russell 1000 Large-Cap Index Fund (Series ID: S000031723)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000098723 | Investor A Shares    |  |
| C000098724 | Institutional Shares |  |
| C000098725 | Class K shares       |  |

### iShares MSCI Total International Index Fund (Series ID: S000033188)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000102140 | Investor A Shares    |  |
| C000102141 | Institutional Shares |  |
| C000102142 | Class K shares       |  |

**BLACKROCK FUNDS III** 

iShares MSCI Total International Index Fund

iShares Russell 1000 Large-Cap Index Fund

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

**Supplement dated February 8, 2023 to the Summary Prospectuses and the** 

**Prospectuses of the Funds, each dated April 29, 2022, as supplemented to date** 

**Effective February 8, 2023, the following changes are made to the Funds' Summary Prospectuses and Prospectuses, as applicable:** 

**The section of the Summary Prospectuses entitled "Key Facts About [Fund] — Portfolio Managers" and the section of the Prospectuses entitled "Fund Overview — Key Facts About [Fund] — Portfolio Managers" are deleted in their entirety and replaced with the following:** 

---

| | | |
|:---|:---|:---|
| **Name** | **Portfolio Manager of**<br> **the Master<br>Portfolio Since** | **Title** |
| Paul Whitehead | 2022 | Managing Director of BlackRock, Inc. |
| Suzanne Henige, CFA<sup>1</sup> | 2020 | Managing Director of BlackRock, Inc. |
| Jennifer Hsui, CFA | 2016 | Managing Director of BlackRock, Inc. |

---

<sup>1</sup> On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Fund.

**The section of the Prospectuses entitled "Details About the Funds — How Each Fund Invests — Total International Index Fund — About the Portfolio Management Team of Total International Index Fund/Total International ex U.S. Index Master Portfolio" is deleted in its entirety and replaced with the following:** 

---

| |
|:---|
| &nbsp;&nbsp;&nbsp;**ABOUT THE PORTFOLIO MANAGEMENT TEAM OF TOTAL INTERNATIONAL INDEX FUND/TOTAL INTERNATIONAL EX U.S. INDEX MASTER PORTFOLIO** |
| &nbsp;&nbsp;&nbsp;Total International ex U.S. Index Master Portfolio is managed by a team of financial professionals. Paul Whitehead, Suzanne Henige, CFA<sup>1</sup>, and Jennifer Hsui, CFA are the portfolio managers of Total International ex U.S. Index Master Portfolio and are jointly and primarily responsible for the day-to-day management of Total International ex U.S. Index Master Portfolio. Please see "Management of the Funds — Portfolio Managers" for additional information about the portfolio management team. |

---

<sup>1</sup> On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Fund.

**The section of the Prospectuses entitled "Details About the Funds — How Each Fund Invests —Large-Cap Index Fund — About the Portfolio Management Team of Large-Cap Index Fund/Large Cap Index Master Portfolio" is deleted in its entirety and replaced with the following:** 

---

| |
|:---|
| &nbsp;&nbsp;&nbsp;**ABOUT THE PORTFOLIO MANAGEMENT TEAM OF LARGE-CAP INDEX FUND/LARGE CAP INDEX MASTER PORTFOLIO** |
| &nbsp;&nbsp;&nbsp;Large Cap Index Master Portfolio is managed by a team of financial professionals. Paul Whitehead, Suzanne Henige, CFA<sup>1</sup>, and Jennifer Hsui, CFA are the portfolio managers of Large Cap Index Master Portfolio and are jointly and primarily responsible for the day-to-day management of Large Cap Index Master Portfolio. Please see "Management of the Funds — Portfolio Managers" for additional information about the portfolio management team. |

---

<sup>1</sup> On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Fund.

------

**The section of the Prospectuses entitled "Management of the Funds — Portfolio Managers" is deleted in its entirety and replaced with the following:** 

Information regarding the portfolio managers of each Master Portfolio is set forth below. Further information regarding the portfolio managers, including other accounts managed, compensation, ownership of Fund shares, and possible conflicts of interest, is available in the Funds' SAI.

---

| | | | |
|:---|:---|:---|:---|
| **Portfolio Manager** | **Primary Role** | **Since** | **Title and Recent Biography** |
| Paul Whitehead | Jointly and primarily responsible for the day-to-day management of each Master Portfolio, including setting the Master Portfolio's overall investment strategy and overseeing the management of the Master Portfolio. | 2022 | Managing Director of BlackRock, Inc. since 2010; Director of BlackRock, Inc from 2009-2010; Principal of Barclays Global Investors ("BGI") from 2002 to 2009. |
| Suzanne Henige, CFA<sup>1</sup> | Jointly and primarily responsible for the day-to-day management of each Master Portfolio, including setting the Master Portfolio's overall investment strategy and overseeing the management of the Master Portfolio. | 2020 | Managing Director of BlackRock, Inc. since 2022; Director of BlackRock, Inc. from 2016 to 2021; Vice President of BlackRock, Inc. from 2011 to 2015. |
| Jennifer Hsui, CFA | Jointly and primarily responsible for the day-to-day management of each Master Portfolio, including setting the Master Portfolio's overall investment strategy and overseeing the management of the Master Portfolio. | 2016 | Managing Director of BlackRock, Inc. since 2011; Director of BlackRock, Inc. from 2009 to 2011; Principal of BGI from 2006 to 2009. |

---

<sup>1</sup> On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Fund.

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