EX-10.21



 EXHIBIT 10.21 

WisdomTree Asset Management, Inc. 

245 Park Avenue, 35th Floor 
 New
York, NY 10167 
 August 9, 2016 
 David
J. Abner 
 Dear David: 
 Reference is made to
your relocation letter agreement, dated July 25, 2016 (“Relocation Agreement”), between you and WisdomTree Asset Management, Inc. (the “Company”), relating to your assignment to the Company’s offices in the United
Kingdom for a period of time. Capitalized terms used and not defined in this amendment agreement (“Amendment”) have the respective meanings assigned to them in the Relocation Agreement. 

Pursuant to Section VIII.D of your Relocation Agreement, if your employment is terminated by the Company under certain circumstances, you will
be entitled to accelerated vesting with respect to a portion of your then-outstanding unvested equity awards in the common stock of WisdomTree Investments, Inc. (“WTI”). The purpose of this Amendment is to amend your Relocation Agreement
for the deemed modification of the terms and conditions governing currently outstanding, unvested equity awards you hold to include provisions relating to acceleration of vesting of such awards consistent with your Relocation Agreement. 

The terms of this Amendment are as follows: 
  

	 	1.	Section VIII.D the Relocation Agreement is hereby amended by inserting the following sentence at the end of the first paragraph of Section VIII.D thereof: 


“The acceleration of vesting provisions of this Section VIII.D shall be deemed to amend the vesting provisions, applicable, in each of the
following agreements: (a) Restricted Stock Agreement, dated January 14, 2014, between you and WTI; (b) Restricted Stock Agreement, dated January 28, 2015, between you and WTI; and (c) Restricted Stock Agreement, dated
January 27, 2016, between you and WTI.” 
  

	 	2.	Except as expressly provided in this Amendment, all of the terms and provisions of the Relocation Agreement are and will remain in full force and effect, and are hereby ratified and confirmed by the parties. On and
after the date hereof, each reference in the Relocation Agreement to “this letter, “this letter agreement,” “hereunder,” “hereof,” “herein” or words of like import will mean and be a reference to the
Relocation Agreement as amended by this Amendment. 









	 	3.	This Amendment shall be construed and governed by the laws of the state of New York, without respect to conflicts of law principles. This Amendment may not be amended or modified unless memorialized in writing and
signed by both you and the Company. This Amendment may be executed in counterparts, each of which is deemed an original, but all of which constitutes one and the same agreement. Delivery of an executed counterpart of this Amendment electronically or
by facsimile shall be effective as delivery of an original executed counterpart of this Amendment. 

 Please acknowledge your acceptance by
signing and dating the concurrence box below and returning this letter to me. 
 Sincerely, 

WISDOMTREE ASSET MANAGEMENT, INC. 
  

			
	By:	 	 /s/ Peter M. Ziemba

	Name: Peter M. Ziemba
	Title: EVP-Business and Legal Affairs

 I agree to the terms and conditions set forth in the above Amendment to my Relocation Agreement. 

 

							
	 /s/ David J. Abner
	 		 	August 9, 2016	 	
	 David J. Abner
	 		 	 Date
	 	

 Acknowledgement 

WisdomTree Investments, Inc. hereby executes this Amendment solely to confirm its agreement to the deemed amendments to the restricted stock agreements
identified in paragraph 1 herein. 
 WISDOMTREE INVESTMENTS, INC. 
  

			
	By:	 	 /s/ Peter M. Ziemba

	Name: Peter M. Ziemba
	Title: EVP-Business and Legal Affairs


  
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