# EDGAR Filing Document

**Accession Number:** 0001100663
**File Stem:** 0001193125-25-194258
**Filing Date:** 2025-9
**Character Count:** 8956
**Document Hash:** dee0f829997ab4cd7b20d5d860925d6c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-25-194258.hdr.sgml**: 20250903

**ACCESSION NUMBER**: 0001193125-25-194258

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250903

**DATE AS OF CHANGE**: 20250902

**EFFECTIVENESS DATE**: 20250903

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** iSHARES TRUST
- **CENTRAL INDEX KEY:** 0001100663

**ORGANIZATION NAME:**
- **EIN:** 943351276
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-92935
- **FILM NUMBER:** 251287369

**BUSINESS ADDRESS:**
- **STREET 1:** 400 HOWARD STREET
- **CITY:** SAN FRANCISCO
- **STATE:** CA
- **ZIP:** 94105
- **BUSINESS PHONE:** (415) 670-2000

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

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** ISHARES TRUST
- **DATE OF NAME CHANGE:** 19991213

## Series and Classes Contracts Data

### iShares Systematic Bond ETF (Series ID: S000060088)

---

|  |  |  |
|:---|:---|:---|
| Class Name                  | Ticker Symbol | Class ID   |
| iShares Systematic Bond ETF | SYSB          | C000196720 |

---

## Series and Classes Contracts Data

### iShares Systematic Bond ETF (Series ID: S000060088)

| Class ID   | Class Name                  | Ticker Symbol   |
|:---|:---|:---|
| C000196720 | iShares Systematic Bond ETF | SYSB            |

## iShares<sup>®</sup>
**iShares Trust** 

**Supplement dated September 3, 2025 (the "Supplement")** 

**to the currently effective** 

**Statement of Additional Information (the "SAI")** 

**for the iShares U.S. Fixed Income Balanced Risk Systematic ETF (FIBR) (the "Fund")** 

***The information in this Supplement updates information in, and should be read in conjunction with, the SAI for the Fund.***

Effective September 2, 2025, the changes set out below are effective for the Fund:

---

| | | |
|:---|:---|:---|
| | **Current** | **New** |
| &nbsp;&nbsp;&nbsp; **Fund Name** | iShares U.S. Fixed Income Balanced<br> Risk Systematic ETF | iShares Systematic Bond ETF |
| &nbsp;&nbsp;&nbsp; **Ticker** | FIBR | SYSB |
| &nbsp;&nbsp;&nbsp;**Underlying Index** | Bloomberg U.S. Fixed Income Balanced<br> Risk Index | BlackRock Universal Systematic Bond Index |

---

All references in the SAI to "iShares U.S. Fixed Income Balanced Risk Systematic ETF," "FIBR" and "Bloomberg U.S. Fixed Income Balanced Risk Index" are replaced with the Fund's new name, new ticker, or new Underlying Index, respectively.

***<u>Changes to the Fund's "Construction and Maintenance of the Underlying Indexes"</u>***

**In the section of the SAI entitled "The Bloomberg Indexes," the "Bloomberg U.S. Fixed Income Balanced Risk Index" section is deleted in its entirety.** 

**The following is added as a new section:** 

**The BlackRock Index Services Index** 

**BlackRock Universal Systematic Bond Index** 

**<u>Number of Components: approximately 1,212</u>** 

**Index Description.** The BlackRock Universal Systematic Bond Index allocates across four components: U.S. Treasury securities, U.S. dollar-denominated mortgage-backed securities ("MBS"), and U.S. dollar-denominated investment-grade and high-yield corporate bonds. The allocations are determined relative to a broader starting universe based on factors including the prevailing economic regime and the prevailing interest rate environment, as determined by BlackRock Index Services, LLC.

Starting from a broad universe of eligible fixed income instruments — including U.S. agencies, foreign government-related bonds, Eurodollar bonds, and 144A bonds — the index applies a series of adjustments and optimizations:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Strategic Overweighting: A baseline 12.5% overweight to high-yield corporate bonds is applied, sourced pro rata from
Treasuries and MBS.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Economic Regime Adjustment: The index adjusts high-yield exposure (+/-2% or +/-4%) based on market signals indicating risk-on or risk-off conditions.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Credit Quality and Value Tilt: Bonds are screened for default probability and optimized to favor securities with higher
default-adjusted spreads, while managing liquidity, turnover, and issuer concentration.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;• Interest Rate Environment Adjustment: The index's duration target is modified by +10% or -10% relative to the starting universe, depending on whether rates are falling or rising, respectively, using optimized Treasury allocations.

The index is rebalanced monthly, with cash flows reinvested across the index.

------

***<u>Changes to the Fund's "Investment Advisory, Administrative and Distribution Services"</u>***

**In the "Portfolio Managers" section of the Fund's SAI, the following is added to the table listing each Portfolio Manager's other types of portfolios and/or accounts:** 

**Jasmita Mohan\*** 

---

| | | |
|:---|:---|:---|
| **Types of Accounts** | **Number** | **Total Assets** |
|  Registered Investment Companies | 7 | 11003000000 |
|  Other Pooled Investment Vehicles | 15 | 4138000000 |
|  Other Accounts | 10 | 7419000000 |

---

\* Information for Ms. Mohan is provided as of July 31, 2025. Portfolio Manager for iShares Systematic Bond ETF only.

**In the "Portfolio Managers" section of the Fund's SAI, the following is added to the table listing each Portfolio Manager's portfolios or accounts with respect to which the investment management fees are based on the performance of those portfolios or accounts:** 

**Jasmita Mohan\*** 

---

| | | |
|:---|:---|:---|
| **Types of Accounts** | **Number of Other**<br>**Accounts with<br>Performance Fees<br>Managed by Portfolio<br>Manager** | **Aggregate of Total<br>Assets** |
|  Registered Investment Companies | 0 | N/A |
|  Other Pooled Investment Vehicles | 3 | 1031000000 |
|  Other Accounts | 3 | 1818000000 |

---

\* Information for Ms. Mohan is provided as of July 31, 2025. Portfolio Manager for iShares Systematic Bond ETF only.

**In the "Portfolio Managers" section of the Fund's SAI, the following is added to the table listing each Portfolio Manager's beneficial ownership of shares of the Funds for which they are primarily responsible for the day-to-day management:** 

**Jasmita Mohan\*** 

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** |
| <br>**Fund** | **None** | **$1 to<br>$10k** | **$10,001<br>to $50k** | **$50,001<br>to $100k** | **$100,001<br>to $500k** | **$500,001<br>to $1m** | **over<br>$1m** |
|  iShares 0-5 Year High Yield Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares 0-5 Year Investment Grade Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares 0-5 Year TIPS Bond ETF | X |  |  |  |  |  |  |
|  iShares 1-3 Year International Treasury Bond ETF | X |  |  |  |  |  |  |
|  iShares Aaa - A Rated Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares BB Rated Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares Broad USD High Yield Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares CMBS ETF | X |  |  |  |  |  |  |
|  iShares Convertible Bond ETF | X |  |  |  |  |  |  |
|  iShares Core 1-5 Year USD Bond ETF | X |  |  |  |  |  |  |
|  iShares Core International Aggregate Bond ETF | X |  |  |  |  |  |  |

---

------

---

| | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** | **Dollar Range** |
| <br>**Fund** | **None** | **$1 to<br>$10k** | **$10,001<br>to $50k** | **$50,001<br>to $100k** | **$100,001<br>to $500k** | **$500,001<br>to $1m** | **over<br>$1m** |
|  iShares ESG Advanced High Yield Corporate Bond ETF | X |  |  |  |  |  |  |
|  iShares Fallen Angels USD Bond ETF | X |  |  |  |  |  |  |
|  iShares Floating Rate Bond ETF | X |  |  |  |  |  |  |
|  iShares GNMA Bond ETF | X |  |  |  |  |  |  |
|  iShares International Treasury Bond ETF | X |  |  |  |  |  |  |
|  iShares J.P. Morgan Broad USD Emerging Markets Bond ETF | X |  |  |  |  |  |  |
|  iShares J.P. Morgan USD Emerging Markets Bond ETF | X |  |  |  |  |  |  |
|  iShares TIPS Bond ETF | X |  |  |  |  |  |  |
|  iShares Treasury Floating Rate Bond ETF | X |  |  |  |  |  |  |
|  iShares U.S. Fixed Income Balanced Risk Systematic ETF | X |  |  |  |  |  |  |
|  iShares U.S. Treasury Bond ETF | X |  |  |  |  |  |  |
|  iShares USD Green Bond ETF | X |  |  |  |  |  |  |

---

\* Data is as of July 31, 2025

If you have any questions, please call 1-800-iShares (1-800-474-2737).

iShares<sup>®</sup> is a registered trademark of BlackRock Fund Advisors and its affiliates.

IS-A-FIBR-0925

**PLEASE RETAIN THIS SUPPLEMENT** 

**FOR FUTURE REFERENCE**