iShares^®

iShares Trust

iShares U.S. ETF Trust

iShares, Inc.

Supplement dated October 28, 2020 (the “Supplement”)

to the Statement of Additional Information (the “SAI”)

for each series of iShares Trust, iShares U.S. ETF Trust and iShares, Inc.

(each, a “Fund”)

The information in this Supplement updates information in, and should be read in conjunction with, each Fund’s SAI.

Effective immediately, each Fund’s SAI is amended as follows:

Change in each Fund’s “General Considerations and Risks”

The section of each Fund’s SAI entitled “General Considerations and Risks” is amended to add the following:

LIBOR Risk. A Fund may be exposed to financial instruments that are tied to the London Interbank Offered Rate (“LIBOR”) to determine payment obligations, financing terms, hedging strategies or investment value. A Fund’s investments may pay interest at floating rates based on LIBOR or may be subject to interest caps or floors based on LIBOR. A Fund may also obtain financing at floating rates based on LIBOR. Derivative instruments utilized by a Fund may also reference LIBOR.

In 2017, the head of the United Kingdom’s Financial Conduct Authority announced a desire to phase out the use of LIBOR by the end of 2021, and it is expected that LIBOR will cease to be published after that time. A Fund may have investments linked to other interbank offered rates, such as the Euro Overnight Index Average (“EONIA”), which may also cease to be published. Various financial industry groups have begun planning for the transition away from LIBOR, but there are challenges to converting certain securities and transactions to a new reference rate (e.g., the Secured Overnight Financing Rate (“SOFR”), which is intended to replace the U.S. dollar LIBOR).

Neither the effect of the LIBOR transition process nor its ultimate success can yet be known. The transition process might lead to increased volatility and illiquidity in markets for, and reduce the effectiveness of new hedges placed against, instruments whose terms currently include LIBOR. While some existing LIBOR-based instruments may contemplate a scenario where LIBOR is no longer available by providing for an alternative rate-setting methodology, there may be significant uncertainty regarding the effectiveness of any such alternative methodologies to replicate LIBOR. Not all existing LIBOR-based instruments may have alternative rate-setting provisions and there remains uncertainty regarding the willingness and ability of issuers to add alternative rate-setting provisions in certain existing instruments. In addition, a liquid market for newly-issued instruments that use a reference rate other than LIBOR still may be developing. There may also be challenges for a Fund to enter into hedging transactions against such newly-issued instruments until a market for such hedging transactions develops. All of the aforementioned may adversely affect a Fund’s performance or NAV.

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

iShares^® is a registered trademark of BlackRock Fund Advisors and its affiliates.

IS-A-ALLSAI-1020

PLEASE RETAIN THIS SUPPLEMENT

FOR FUTURE REFERENCE