497 1 main.htm

Fidelity (logo) Investments®|

245 Summer Street
Boston MA 02210
617 563 7000


August 16, 2013

U.S. Securities & Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549


Fidelity Commonwealth Trust (the trust):


Fidelity Series 100 Index Fund (the fund)


File Nos. 002-52322 and 811-02546


Ladies and Gentlemen:

Transmitted herewith for filing pursuant to Rule 497(e) under the Securities Act of 1933 (33 Act), as amended, are exhibits containing interactive data format risk/return summary information for supplements to the registration statement for the fund listed above. The purpose of this filing is to submit the 497 filing in XBRL for the fund.


Very truly yours,




/s/ Jeffrey LaFountain


Jeffrey LaFountain


Legal Product Group