Thompson, Hickey, Cunningham, Clow, April & Dolan, P.A.    A TTORNEYS AND C OUNSELORS AT L AW

Daniel H. April

Janet Clow

David F. Cunningham

Patrick J. Dolan

John M. Hickey

C.W.N. Thompson, Jr.

March 6, 2014

Division of Investment Management

Securities and Exchange Commission

450 Fifth Street, N.W.

Washington, D.C. 20549

 

  Re: Thornburg Investment Trust

Registration Number under the Securities Act of 1933: 33-14905

Registration Number under the Investment Company Act of 1940: 811-05201

Ladies and Gentlemen:

On behalf of the above-referenced Registrant and pursuant to Rule 497 under the Securities Act of 1933, as amended, I have attached for filing exhibits containing interactive data format risk/return summary information. These interactive data files relate to the Retirement Plan Shares Prospectus that the Registrant filed with the Securities and Exchange Commission on February 28, 2014 pursuant to Rule 497 (Accession No. 0001193125-14-075511).

Please contact me at the number referenced below if you have any questions regarding this filing.

 

Sincerely,
/s/ Daniel April
Daniel April

 

460 St. Michael’s Drive   E-mail: dan_april@catchlaw.com   Tel.: (505) 988-2900
Suite 1000   Web Address: www.catchlaw.com   Extension 103
Santa Fe, New Mexico 87505     Fax: (505) 988-2901
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