UNITED STATES
 SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 14A
Proxy Statement Pursuant to Section 14(a) of the
Securities Exchange Act of 1934 (Amendment No. )

☑	Filed by the Registrant	☐	Filed by a Party other than the Registrant	     	

CHECK THE APPROPRIATE BOX:	
☐	 	Preliminary Proxy Statement	
☐		Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))	
☐		Definitive Proxy Statement	
☑	 	Definitive Additional Materials	
☐		Soliciting Material Under Rule 14a-12	

Pinnacle West Capital Corporation
(Name of Registrant as Specified In Its Charter)
 (Name of Person(s) Filing Proxy Statement, if Other Than the Registrant)

PAYMENT OF FILING FEE (CHECK THE APPROPRIATE BOX):	
☑	 	No fee required.	
☐		Fee computed on table below per Exchange Act Rules 14a-6(i)(1) and 0-11.	
			1) Title of each class of securities to which transaction applies:	
			2) Aggregate number of securities to which transaction applies:	
			3) Per unit price or other underlying value of transaction computed pursuant to Exchange Act Rule 0-11 (set forth the amount on which the filing fee is calculated and state how it was determined):	
			4) Proposed maximum aggregate value of transaction:	
			5) Total fee paid:	
☐		Fee paid previously with preliminary materials:	
☐		Check box if any part of the fee is offset as provided by Exchange Act Rule 0-11(a)(2) and identify the filing for which the offsetting fee was paid previously. Identify the previous filing by registration statement number, or the form or schedule and the date of its filing.	
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*** Exercise Your Right to Vote ***
 Important Notice Regarding the Availability of Proxy Materials for the
Shareholder Meeting to Be Held on May 20, 2020.
PINNACLE WEST CAPITAL
 CORPORATION

PINNACLE WEST CAPITAL CORPORATION
ATTN: SHAREHOLDER SERVICES
 400 NORTH FIFTH STREET, STA 8602
PHOENIX, AZ 85004
Meeting Information
Meeting Type:	Annual Meeting	
For holders as of:     	March 12, 2020    	
Date:    	May 20, 2020	Time:    	10:30 a.m. MST	
Location:    	Meeting live via the Internet-please visit
www.virtualshareholdermeeting.com/PNW.	
The company will be hosting the meeting live via the Internet this year. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/PNW and be sure to have the information that is printed in the box marked by the arrow ➔XXXX XXXX XXXX XXXX (located on the following page).
You are receiving this communication because you hold shares in the company named above.
This is not a ballot. You cannot use this notice to vote these shares by mail. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com, scan the QR Barcode on the reverse side, or easily request a paper copy (see reverse side).
We encourage you to access and review all of the important information contained in the proxy materials before voting.
See the reverse side of this notice to obtain proxy materials and voting instructions.

  
Before You Vote
How to Access the Proxy Materials
Proxy Materials Available to VIEW or RECEIVE:
NOTICE AND PROXY STATEMENT           10-K WRAP
How to View Online:
Have the information that is printed in the box marked by the arrow ➔XXXX XXXX XXXX XXXX (located on the following page)  and visit: www.proxyvote.com, or scan the QR Barcode below.
How to Request and Receive a PAPER or E-MAIL Copy:
If you want to receive a paper or e-mail copy of these documents, you must request one. There is NO charge for requesting a copy.
Please choose one of the following methods to make your request:
1) BY INTERNET:	www.proxyvote.com	
2) BY TELEPHONE:       	1-800-579-1639      	
3) BY E-MAIL*:	sendmaterial@proxyvote.com	

*	If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow ➔XXXX XXXX XXXX XXXX (located on the following page) in the subject line.	

Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before May 6, 2020 to facilitate timely delivery.

How To Vote
Please Choose One of the Following Voting Methods		SCAN TO
VIEW MATERIALS & VOTE		

Vote By Internet:	
 	
Before The Meeting:	
Go to www.proxyvote.com or from a smartphone, scan the QR Barcode above. Have the information that is printed in the box marked by the arrow ➔XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions.	
 	
During The Meeting:	
Go to www.virtualshareholdermeeting.com/PNW. Have the information that is printed in the box marked by the arrow ➔XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions.	
 	
Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card.	

  

Voting Items	
				 	
The Board of Directors recommends you vote FOR the following:	
 	
1.     	Election of Directors				
	Nominees:	        			
 	 	 	 	 	
	01)      	Glynis A. Bryan		07)      	Kathryn L. Munro	
	02)	Denis A. Cortese, M.D.	 	08)	Bruce J. Nordstrom	
	03)	Richard P. Fox		09)	Paula J. Sims	
	04)	Jeffrey B. Guldner		10)	James E. Trevathan, Jr.	
	05)	Dale E. Klein, Ph.D.		11)	David P. Wagener	
	06)	Humberto S. Lopez				
 	
The Board of Directors recommends you vote FOR proposal 2:	
 		
2.     	Advisory vote to approve executive compensation as disclosed in the 2020 Proxy Statement.	
 	
The Board of Directors recommends you vote FOR proposal 3:	
 		
3.     	Ratify the appointment of the independent accountant for the year ending December 31, 2020.	
 	
The Board of Directors recommends you vote AGAINST proposal 4:	
 		
4.     	Vote on the approval of a shareholder proposal asking the Company to amend its governing documents to reduce the ownership threshold to 10% to call special shareholder meetings, if properly presented at the meeting.	
 	
In their discretion, the proxies are authorized to vote on such other matters as may properly come before the meeting or any adjournment or postponement thereof.