Exhibit 99.(a)(16)

Creation and Designation of

Additional Series of Shares of Beneficial Interest of

American Beacon Funds

Pursuant to Article III, Section 1 of the Amended and Restated Declaration of Trust of the American Beacon Funds (the “Trust”) dated August 20, 2019 (“Trust Instrument”), the American Beacon TwentyFour Short Term Bond Fund (the “Fund”), a new series of the Trust, was created by a resolution of the Trust’s Board of Trustees (“Board”) on November 12, 2019.

The Fund and its shares of beneficial interest (“Shares”) are designated as follows:

1. The initial classes of Shares of the Fund are designated as R6 Class Shares, Y Class Shares, A Class Shares and C Class shares. Each class of Shares has the same rights and obligations, except as provided in the Trust Instrument, the Fund’s Registration Statement on Form N-1A (“Registration Statement”) or by resolution adopted by the Board. The Fund’s Shares shall be offered for sale and redeemed on the terms set forth in the Trust’s Registration Statement.

2. All rights and preferences of the Fund and the Shares are as set forth in the Trust Instrument dated August 20, 2019 and the Amended and Restated Bylaws of the Trust dated August 20, 2019.

IN WITNESS WHEREOF, the undersigned have executed this instrument the 2nd day of December 2019.

/s/ Gilbert G. Alvarado

Gilbert G. Alvarado

/s/ Joseph B. Armes

Joseph B. Armes

/s/ Gerard J. Arpey

Gerard J. Arpey

/s/ Brenda A. Cline

Brenda A. Cline

/s/ Eugene J. Duffy

Eugene J. Duffy

/s/ Alan D. Feld

Alan D. Feld

/s/ Claudia A. Holz

Claudia A. Holz

/s/ Douglas A. Lindgren

Douglas A. Lindgren

/s/ Richard A. Massman

Richard A. Massman

/s/ Barbara J. McKenna

Barbara J. McKenna

/s/ R. Gerald Turner

R. Gerald Turner

 2