# EDGAR Filing Document

**Accession Number:** 0000764622
**File Stem:** 0001628280-26-011343
**Filing Date:** 2026-2
**Character Count:** 11718
**Document Hash:** a7f4998ff76505e86e2dc4d0a7cd8510
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-26-011343.hdr.sgml**: 20260224

**ACCESSION NUMBER**: 0001628280-26-011343

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260220

**FILED AS OF DATE**: 20260224

**DATE AS OF CHANGE**: 20260224

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Geisler Theodore N
- **CENTRAL INDEX KEY:** 0001799703

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-08962
- **FILM NUMBER:** 26673801

**MAIL ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **STREET 2:** MAIL STATION 8602
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PINNACLE WEST CAPITAL CORP
- **CENTRAL INDEX KEY:** 0000764622
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRIC SERVICES [4911]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 860512431
- **STATE OF INCORPORATION:** AZ
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **STREET 2:** MS 8695
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004
- **BUSINESS PHONE:** 602 250 1000

**MAIL ADDRESS:**
- **STREET 1:** 400 NORTH FIFTH STREET
- **STREET 2:** MS 8695
- **CITY:** PHOENIX
- **STATE:** AZ
- **ZIP:** 85004

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** AZP GROUP INC
- **DATE OF NAME CHANGE:** 19870506

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Geisler Theodore N<br><sub>(Last) (First) (Middle)</sub><br>400 N. 5TH STREET<br><sub>(Street)</sub><br>PHOENIX, AZ 85004<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-02-20 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_Chairman, CEO and President_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>PINNACLE WEST CAPITAL CORP [ PNW ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-02-20 |  | M |  | 2248<sup>(1)</sup> | A | <sup>(1)</sup> | 2248 | D |  |
| Common Stock | 2026-02-20 |  | D<sup>(2)</sup> |  | 361 | D | $98.34 | 1887 | D |  |
| Common Stock | 2026-02-20 |  | F<sup>(3)</sup> |  | 790 | D | $98.34 | 1097 | D |  |
| Common Stock | 2026-02-20 |  | M |  | 1634<sup>(1)</sup> | A | <sup>(1)</sup> | 2731 | D |  |
| Common Stock | 2026-02-20 |  | D<sup>(2)</sup> |  | 192 | D | $98.34 | 2539 | D |  |
| Common Stock | 2026-02-20 |  | F<sup>(3)</sup> |  | 604 | D | $98.34 | 1935 | D |  |
| Common Stock | 2026-02-20 |  | M |  | 1943<sup>(1)</sup> | A | <sup>(1)</sup> | 3878 | D |  |
| Common Stock | 2026-02-20 |  | D<sup>(2)</sup> |  | 152 | D | $98.34 | 3726 | D |  |
| Common Stock | 2026-02-20 |  | F<sup>(3)</sup> |  | 750 | D | $98.34 | 2976 | D |  |
| Common Stock | 2026-02-20 |  | M |  | 1736<sup>(1)</sup> | A | <sup>(1)</sup> | 4712 | D |  |
| Common Stock | 2026-02-20 |  | D<sup>(2)</sup> |  | 67 | D | $98.34 | 4645 | D |  |
| Common Stock | 2026-02-20 |  | F<sup>(3)</sup> |  | 699 | D | $98.34 | 3946 | D |  |
| Common Stock | 2026-02-20 |  | M |  | 2458<sup>(1)</sup> | A | <sup>(1)</sup> | 6404 | D |  |
| Common Stock | 2026-02-20 |  | D<sup>(2)</sup> |  | 96 | D | $98.34 | 6308 | D |  |
| Common Stock | 2026-02-20 |  | F<sup>(3)</sup> |  | 989 | D | $98.34 | 5319 | D |  |
| Common Stock | 2026-02-20 |  | G<sup>(4)</sup> |  | 5319<sup>(4)</sup> | D | <sup>(4)</sup> | 0 | D |  |
| Common Stock | 2026-02-20 |  | G<sup>(4)</sup> |  | 5319<sup>(4)</sup> | A | <sup>(4)</sup> | 37567 | I | by Trust |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units | <sup>(1)</sup> | 2026-02-20 |  | M |  |  | 2248<sup>(5)</sup> | <sup>(6)</sup> | <sup>(6)</sup> | Common Stock | 2248 | <sup>(1)</sup> | 0 | D |  |
| Restricted Stock Units | <sup>(1)</sup> | 2026-02-20 |  | M |  |  | 1634<sup>(7)</sup> | <sup>(8)</sup> | <sup>(8)</sup> | Common Stock | 1634 | <sup>(1)</sup> | 1638<sup>(9)</sup> | D |  |
| Restricted Stock Units | <sup>(1)</sup> | 2026-02-20 |  | M |  |  | 1943<sup>(10)</sup> | <sup>(11)</sup> | <sup>(11)</sup> | Common Stock | 1943 | <sup>(1)</sup> | 3885<sup>(12)</sup> | D |  |
| Restricted Stock Units | <sup>(1)</sup> | 2026-02-20 |  | M |  |  | 1736<sup>(13)</sup> | <sup>(14)</sup> | <sup>(14)</sup> | Common Stock | 1736 | <sup>(1)</sup> | 5208<sup>(15)</sup> | D |  |
| Restricted Stock Units | <sup>(1)</sup> | 2026-02-20 |  | M |  |  | 2458<sup>(16)</sup> | <sup>(17)</sup> | <sup>(17)</sup> | Common Stock | 2458 | <sup>(1)</sup> | 7369<sup>(18)</sup> | D |  |

---

### Footnotes:

(1) Each Restricted Stock Unit represents a contingent right to receive the economic equivalent of one share of the Company's common stock. The Restricted Stock Units will be settled in 100% shares ofcommon stock.

(2) Represents the cash settlement of Restricted Stock Units received in connection with the settlement of dividend equivalent rights.

(3) Shares retained by the Company for purpose of meeting tax withholding requirements. The recipient retained all other shares.

(4) The reporting person gifted the shares received on February 20, 2026 to a revocable family trust.

(5) The number of derivative securities in Column 5 includes 361 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rightsaccrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

(6) The Restricted Stock Units award was granted and was effective in February 2022, and vests in four equal, annual installments beginning on February 20, 2023.

(7) The number of derivative securities in Column 5 includes 192 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

(8) The Restricted Stock Units award was granted and was effective in February 2023, and vests in four equal, annual installments beginning on February 20, 2024.

(9) Includes 196 Restricted Stock Units received in connection with the settlement of dividend equivalent rights.

(10) The number of derivative securities in Column 5 includes 152 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

(11) The Restricted Stock Units award was granted and was effective in February 2024, and vests in four equal, annual installments beginning on February 20, 2025.

(12) Includes 303 Restricted Stock Units received in connection with the settlement of dividend equivalent rights.

(13) The number of derivative securities in Column 5 includes 67 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

(14) The Restricted Stock Units award was granted and was effective in February 2025, and vests in four equal, annual installments beginning on February 20, 2026.

(15) Includes 201 Restricted Stock Units received in connection with the settlement of dividend equivalent rights.

(16) The number of derivative securities in Column 5 includes 96 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

(17) The Restricted Stock Units award was granted and was effective in April 2025, and vests in four equal, annual installments beginning on February 20, 2026.

(18) The number of derivative securities in Column 5 includes 283 vested Restricted Stock Units received in connection with the settlement of dividend equivalent rights. Dividend equivalent rights accrue with respect to these Restricted Stock Units when and as cash dividends are paid on the Company's common stock.

**Signature:** /s/  Melissa Sallee, Attorney-in-Fact  
**Date:** 2026-02-24

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**