Exhibit (a)(26)

THORNBURG INVESTMENT TRUST

TWENTY-SEVENTH AMENDMENT AND SUPPLEMENT TO

AGREEMENT AND DECLARATION OF TRUST

THIS TWENTY-SEVENTH AMENDMENT AND SUPPLEMENT is made by Garrett Thornburg, David A. Ater, David D. Chase, Sally Corning, Susan H. Dubin, Brian J. McMahon, Owen D. Van Essen and James W. Weyhrauch (the “Trustees”).

The Trust was formed on June 3, 1987 by an Agreement and Declaration of Trust - Limited Term Trust dated June 3, 1987. Section 3.1 permits the creation of new series of shares in addition to the series established and designated in Section 3.2.

Accordingly, by execution of this Amendment and Supplement, the Trustees effect the following amendment to the Agreement and Declaration of Trust.

Creation of New Series

The Trustees establish a new series of shares designated “Thornburg Liquidity Management Fund” effective December 8, 2014. The new series will have the relative rights and preferences described in Section 3.2 of the Agreement and Declaration of Trust.

The Trustees effect this amendment as of December 8, 2014, and direct the Trust’s president to file, or cause to be filed, this Amendment and Supplement in the appropriate governmental offices.

/s/ Garrett Thornburg	/s/ Susan H. Dubin
Garrett Thornburg	Susan H. Dubin
/s/ David A. Ater	/s/ Brian J. McMahon
David A. Ater	Brian J. McMahon
/s/ David D. Chase	/s/ Owen D. Van Essen
David D. Chase	Owen D. Van Essen
/s/ Sally Corning	/s/ James W. Weyhrauch
Sally Corning	James W. Weyhrauch

Thornburg Investment Trust Twenty-Seventh Amendment and Supplement to Agreement and Declaration of Trust Page 1 of 1