# EDGAR Filing Document

**Accession Number:** 0000893818
**File Stem:** 0001193125-23-047994
**Filing Date:** 2023-2
**Character Count:** 5296
**Document Hash:** c6ebdd31c0d80bd0ffd31d6759097584
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-047994.hdr.sgml**: 20230224

**ACCESSION NUMBER**: 0001193125-23-047994

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230224

**DATE AS OF CHANGE**: 20230224

**EFFECTIVENESS DATE**: 20230224

**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:** 23663430

**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 S&P 500 Index Fund (Series ID: S000004272)

---

|  |  |  |
|:---|:---|:---|
| Class Name           | Ticker Symbol | Class ID   |
| Class K Shares       | WFSPX         | C000011979 |
| Investor A Shares    | nan           | C000117725 |
| Institutional Shares | nan           | C000117726 |
| Service Shares       | nan           | C000117728 |
| Investor P Shares    | nan           | C000201951 |
| Class G Shares       | nan           | C000212062 |

---

## Series and Classes Contracts Data

### iShares S&P 500 Index Fund (Series ID: S000004272)

| Class ID   | Class Name           | Ticker Symbol   |
|:---|:---|:---|
| C000011979 | Class K Shares       | WFSPX           |
| C000117725 | Investor A Shares    |  |
| C000117726 | Institutional Shares |  |
| C000117728 | Service Shares       |  |
| C000201951 | Investor P Shares    |  |
| C000212062 | Class G Shares       |  |

**BLACKROCK FUNDS III** 

iShares S&P 500 Index Fund

(the "Fund")

**Supplement dated February 24, 2023 to the Statement of Additional Information ("SAI") of the Fund, dated April 29, 2022** 

**Effective February 8, 2023, the following changes are made to the Fund's SAI:** 

**The section entitled "Management, Advisory and Other Service Arrangements — Information Regarding the Portfolio Managers" is revised as follows:** 

**The first paragraph is deleted in its entirety and replaced with the following:** 

Paul Whitehead, Suzanne Henige, CFA, and Jennifer Hsui, CFA are the portfolio managers and are jointly and primarily responsible for the day-to-day management of the Master Portfolio's portfolio. On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Master Portfolio.

**The sub-section entitled "Other Funds and Accounts Managed" is deleted in its entirety and replaced with the following:** 

The following table sets forth information about funds and accounts other than the Master Portfolio for which the portfolio managers are primarily responsible for the day-to-day portfolio management as of December 31, 2021.

---

| | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|
| | **Number of Other Accounts Managed<br>and Assets by Account Type** | **Number of Other Accounts Managed<br>and Assets by Account Type** | **Number of Other Accounts Managed<br>and Assets by Account Type** | **Number of Other Accounts and Assets<br>for Which Advisory Fee is<br>Performance-Based** | **Number of Other Accounts and Assets<br>for Which Advisory Fee is<br>Performance-Based** | **Number of Other Accounts and Assets<br>for Which Advisory Fee is<br>Performance-Based** |
| <br>**Name of Portfolio<br>Manager** | **Other**<br>**Registered**<br>**Investment**<br>**Companies** | **Other<br>Pooled**<br>**Investment**<br>**Vehicles** | **Other**<br>**Accounts** | **Other**<br>**Registered**<br>**Investment**<br>**Companies** | **Other<br>Pooled**<br>**Investment**<br>**Vehicles** | **Other**<br>**Accounts** |
| Suzanne Henige, CFA\* | 73<br>$168.64 Billion | 6<br>$5.13 Billion | 0<br>$0 | 0<br>$0 | 0<br>$0 | 0<br>$0 |
| Jennifer Hsui, CFA | 329<br>$2.09 Trillion | 58<br> $85.23 Billion | 44<br>$41.79 Billion | 0<br>$0 | 0<br>$0 | 0<br>$0 |
| Paul Whitehead | 0<br>$0 | 0<br>$0 | 0<br>$0 | 0<br>$0 | 0<br>$0 | 0<br>$0 |

---

\* On or about April 14, 2023, Suzanne Henige will no longer serve as a portfolio manager of the Master Portfolio.

**The last sentence of the first paragraph of the sub-section entitled "Discretionary Incentive Compensation" is deleted in its entirety and replaced with the following:** 

The performance of Mr. Whitehead and Mses. Henige and Hsui is not measured against a specific benchmark.

**The first paragraph of the sub-section entitled "Portfolio Manager Beneficial Holdings" is deleted in its entirety and replaced with the following:** 

As of December 31, 2021, Mr. Whitehead and Mses. Henige and Hsui did not beneficially own any shares of the Fund.

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

SAI-SP500-0223SUP