EXHIBIT (h.21) AMENDMENT TO SUBLICENSE AGREEMENT This Amendment to the Sublicense Agreement dated April 25, 2000 (the "Agreement") between BlackRock Institutional Trust Company, N.A. ("BTC"), a national banking association, and iShares Trust...

                                                                 EXHIBIT (h.21)

                       AMENDMENT TO SUBLICENSE AGREEMENT

   This Amendment to the Sublicense Agreement dated April 25, 2000 (the
"Agreement") between BlackRock Institutional Trust Company, N.A. ("BTC"), a
national banking association, and iShares Trust ("iShares"), a Delaware
statutory trust, is effective as of September 22, 2009.

   WHEREAS, pursuant to Section 7 of the Agreement the parties may amend the
Agreement from time to time; and

   NOW THEREFORE, Exhibit A is hereby deleted in its entirety and amended to
read as attached.

   IN WITNESS WHEREOF, the parties hereto have caused this Amendment to the
Agreement to be executed as of the date first set forth above.

BLACKROCK INSTITUTIONAL TRUST COMPANY, N.A.

By:     /s/ Xxxxxxx X. Xxxxxxxxx
        ------------------------------
Name:   Xxxxxxx X. Xxxxxxxxx
Title:  Managing Director

By:     /s/ X. Xxxxxx
        ------------------------------
Name:   X. Xxxxxx
Title:  Managing Director

iSHARES TRUST

By:     /s/ Xxxx Xxx
        ------------------------------
Name:   Xxxx Xxx
Title:  Treasurer and Chief Financial Officer



                                   Exhibit A

Xxxxxxx 1000(R) Growth Index
Xxxxxxx 1000(R) Index
Xxxxxxx 1000(R) Value Index
Xxxxxxx 2000(R) Growth Index
Xxxxxxx 2000(R) Index
Xxxxxxx 2000(R) Value Index
Xxxxxxx 3000(R) Growth Index
Xxxxxxx 3000(R) Index
Xxxxxxx 3000(R) Value Index
Xxxxxxx Microcap(TM) Index
Xxxxxxx Xxxxxx(R) Growth Index
Xxxxxxx Midcap(R) Index
Xxxxxxx Xxxxxx(R) Value Index
Xxxxxxx Top 200 Index
Xxxxxxx Top 200 Growth Index
Xxxxxxx Top 200 Value Index