497 1 d935661d497.htm ISHARES MSCI TOTAL INTERNATIONAL INDEX/ISHARES RUSSELL 1000 LARGE-CAP INDEX iShares MSCI Total International Index/iShares Russell 1000 Large-Cap Index

BLACKROCK FUNDS III

iShares MSCI Total International Index Fund

iShares Russell 1000 Large-Cap Index Fund

(each, a “Fund”)

Supplement dated May 16, 2025 to the Statement of Additional Information (“SAI”)

of each Fund, dated April 30, 2025, as amended or supplemented to date

Effective June 30, 2025, the following changes are made to each 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: 

Jennifer Hsui, CFA, Matt Waldron, CFA, Peter Sietsema, CFA, and Steven White are the portfolio managers of the Master Portfolios and are jointly and primarily responsible for the day-to-day management of each 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 the funds and accounts other than the applicable Master Portfolio for which the portfolio managers are jointly and primarily responsible for the day-to-day portfolio management as of December 31, 2024.

Total International ex US Index Master Portfolio

 

    Number of Other Accounts Managed
and Assets by Account Type
  Number of Other Accounts and Assets
for Which Advisory Fee is
Performance-Based
Name of Portfolio
Manager
 

Other

Registered

Investment

Companies

 

Other
Pooled

Investment

Vehicles

 

Other

Accounts

 

Other

Registered

Investment

Companies

 

Other
Pooled

Investment

Vehicles

 

Other

Accounts

Jennifer Hsui, CFA   352

$2.60 Trillion

  0

$0

  0

$0

  0

$0

  0

$0

  0

$0

Matt Waldron, CFA   0

$0

  0

$0

  0

$0

  0

$0

  0

$0

  0

$0

Peter Sietsema, CFA   70

$162.28 Billion

  3

$62.57 Million

  2

$4.02 Billion

  0

$0

  0

$0

  0

$0

Steven White   0

$0

  0

$0

  0

$0

  0

$0

  0

$0

  0

$0


Large Cap Index Master Portfolio

 

    Number of Other Accounts Managed
and Assets by Account Type
   Number of Other Accounts and Assets
for Which Advisory Fee is
Performance-Based
Name of Portfolio
Manager
 

Other

Registered

Investment

Companies

 

Other
Pooled

Investment

Vehicles

 

Other

Accounts

  

Other

Registered

Investment

Companies

  

Other
Pooled

Investment

Vehicles

  

Other

Accounts

Jennifer Hsui, CFA   352

$2.57 Trillion

  0

$0

  0

$0

   0

$0

   0

$0

   0

$0

Matt Waldron, CFA   0

$0

  0

$0

  0

$0

   0

$0

   0

$0

   0

$0

Peter Sietsema, CFA   70

$162.28 Billion

  3

$62.57 Million

  2

$4.02 Billion

   0

$0

   0

$0

   0

$0

Steven White   0

$0

  0

$0

  0

$0

   0

$0

   0

$0

   0

$0

The last sentence of sub-section entitled “Portfolio Manager Compensation Overview — Discretionary Incentive Compensation” is deleted in its entirety and replaced with the following:

The performance of Messrs. Waldron, Sietsema, and White and Ms. Hsui is not measured against a specific benchmark.

The sub-section entitled “Portfolio Manager Beneficial Holdings” is deleted in its entirety and replaced with the following:

The following table sets forth the dollar range of equity securities of the Fund beneficially owned by the portfolio managers as of December 31, 2024.

 

Portfolio

Manager

     Funds Managed  

Dollar Range of Equity

Securities Beneficially Owned

Jennifer Hsui, CFA     

Total International Index Fund

Large-Cap Index Fund

 

None

None

Matt Waldron, CFA     

Total International Index Fund

Large-Cap Index Fund

 

None

None

Peter Sietsema, CFA     

Total International Index Fund

Large-Cap Index Fund

 

None

None

Steven White     

Total International Index Fund

Large-Cap Index Fund

 

None

None

Shareholders should retain this Supplement for future reference.

 

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